Nanofabrication
Ultra-efficient frequency conversion in quasi-phase-matched lithium niobate microrings
We demonstrate quasi-phase-matched frequency conversion in a chip-integrated lithium niobate microring resonator, whose normalized efficiency reaches 230,000%/W or 10^−6 per single photon.
https://opg.optica.org/optica/fulltext.cfm?uri=optica-6-9-1244&id=420689
JY Chen, ZH Ma, YM Sua, Z Li, C Tang, YP Huang
Ultrabright Quantum Photon Sources on Chip
Quantum photon sources of high rate, brightness, and purity are increasingly desirable as quantum information systems are quickly scaled up and applied to many fields. Using a periodically poled lithium niobate microresonator on chip, we demonstrate photon-pair generation at high rates of 8.5 and 36.3 MHz using only 3.4 and 13.4 μ W pump power, respectively, marking orders of magnitude improvement over the state of the art, across all material platforms. These results constitute the first direct measurement of the device’s giant single photon nonlinearity. The measured coincidence to accidental ratio is well above 100 at those high rates and reaches 14 682±4427 at a lower pump power. The same chip enables heralded single-photon generation at tens of megahertz rates, each with low autocorrelation g H (2)(0)= 0.008 and 0.097 for the microwatt pumps, which marks a new milestone. Such distinct …
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.125.263602
Z Ma, JY Chen, Z Li, C Tang, YM Sua, H Fan, YP Huang
Multidimensional mode-separable frequency conversion for high-speed quantum communication
Quantum frequency conversion (QFC) of photonic signals preserves quantum information while simultaneously changing the signal wavelength. A common application of QFC is to translate the wavelength of a signal compatible with the current fiber-optic infrastructure to a shorter wavelength more compatible with high-quality single-photon detectors and optical memories. Recent work has investigated the use of QFC to manipulate and measure specific temporal modes (TMs) through tailoring the pump pulses. Such a scheme holds promise for multidimensional quantum state manipulation that is both low loss and re-programmable on a fast time scale. We demonstrate the first QFC temporal mode sorting system in a four-dimensional Hilbert space, achieving a conversion efficiency and mode separability as high as 92% and 0.84, respectively. A 20-GHz pulse train is projected onto 6 different TMs, including …
https://opg.optica.org/abstract.cfm?uri=optica-3-12-1300
P Manurkar, N Jain, M Silver, YP Huang, C Langrock, MM Fejer, P Kumar, ...
Efficient parametric frequency conversion in lithium niobate nanophotonic chips
Chip-integrated nonlinear photonics holds the key for advanced optical information processing with superior performance and novel functionalities. Here, we present an optimally mode-matched, periodically poled lithium niobate nanowaveguide for efficient parametric frequency conversions on chip. Using a 4-mm nanowaveguide with subwavelength mode confinement, we demonstrate second harmonic generation with efficiency over 2200% W ^−1 c m ^−2, and broadband difference frequency generation over a 4.3-THz spectral span. These allow us to generate correlated photon pairs over multiple frequency channels via spontaneous parametric down conversion, all in their fundamental spatial modes, with a coincidence to accidental ratio as high as 600. The high efficiency and dense integrability of the present chip devices may pave a viable route to scalable nonlinear applications in …
https://opg.optica.org/abstract.cfm?uri=osac-2-10-2914
J Chen, YM Sua, Z Ma, C Tang, Z Li, Y Huang
High-extinction electro-optic modulation on lithium niobate thin film
Integrated nanophotonics using lithium-niobate-on-insulator promises much-awaited solutions for scalable photonics techniques. One of its core functions is electro-optic modulation, which currently suffers limited extinction (<30 dB) due to inevitable fabrication errors. We exploit a cascaded Mach–Zehnder interferometry design to offset those errors, demonstrating up to 53 dB modulation extinction for a wide range of wavelengths between 1500 nm and 1600 nm. Together, its favorable features of chip integration, high extinction, good stability, and being broadband may prove valuable in a plethora of flourishing photonics applications.
https://opg.optica.org/abstract.cfm?uri=ol-44-5-1265
M Jin, JY Chen, YM Sua, YP Huang
Optical sum-frequency generation in a whispering-gallery-mode resonator
We demonstrate sum-frequency generation between a telecom wavelength and the Rb D2 line, achieved through natural phase matching in a nonlinear whispering gallery mode resonator. Due to the strong optical field confinement and ultra high Q of the cavity, the process saturates already at sub-mW pump peak power, at least two orders of magnitude lower than in existing waveguide-based devices. The experimental data are in agreement with the nonlinear dynamics and phase matching theory based on spherical geometry. Our experimental and theoretical results point toward a new platform for manipulating the color and quantum states of light waves for applications such as atomic memory based quantum networking and logic operations with optical signals.
https://iopscience.iop.org/article/10.1088/1367-2630/16/5/053025/meta
DV Strekalov, AS Kowligy, YP Huang, P Kumar
Modal phase matched lithium niobate nanocircuits for integrated nonlinear photonics
High complexity, dense integrated nanophotonic circuits possessing strong non-linearities are desirable for a breadth of applications in classical and quantum optics. In this work, we study phase matching via modal engineering in lithium niobate (LN) waveguides and microring resonators on chip for second harmonic generation (SHG). By carefully engineering the geometry dispersion, we observe a 26% W^−1cm^−2 normalized efficiency for SHG in a waveguide with submicron transverse mode confinement. With similar cross-sectional dimensions, we demonstrate a phase matched microring resonator with 10 times enhancement on SHG. Our platform is capable of harnessing the strongest optical nonlinear and electro-optic effects in LN on chip with unrestricted planar circuit layouts. It offers opportunities for dense and scalable integration of efficient photonic devices with low loss and high nonlinearity.
https://opg.optica.org/abstract.cfm?uri=osac-1-1-229
JY Chen, YM Sua, H Fan, YP Huang
Efficient and highly tunable second-harmonic generation in Z-cut periodically poled lithium niobate nanowaveguides
Thin-film lithium-niobate-on-insulator (LNOI) has emerged as a superior integrated-photonics platform for linear, nonlinear, and electro-optics. Here we combine quasi-phase-matching, dispersion engineering, and tight mode confinement to realize nonlinear parametric processes with both high efficiency and wide wavelength tunability. On a millimeter-long, Z-cut LNOI waveguide, we demonstrate efficient (1900±500%W^−1cm^−2) and highly tunable (−1.71nm/K) second-harmonic generation from 1530 to 1583 nm by type-0 quasi-phase-matching. Our technique is applicable to optical harmonic generation, quantum light sources, frequency conversion, and many other photonic information processes across visible to mid-IR spectral bands.
https://opg.optica.org/abstract.cfm?uri=ol-45-13-3789
JY Chen, C Tang, ZH Ma, Z Li, YM Sua, YP Huang
Experimental demonstration of interaction-free all-optical switching via the quantum Zeno effect
We experimentally demonstrate all-optical interaction-free switching using the quantum Zeno effect, achieving a high contrast of 35∶ 1. The experimental data match a zero-parameter theoretical model for several different regimes of operation, indicating a good understanding of the switch’s characteristics. We also discuss extensions of this work that will allow for significantly improved performance, and the integration of this technology onto chip-scale devices, which can lead to ultra-low-power all-optical switching, a long-standing goal with applications to both classical and quantum information processing.
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.110.240403
KT McCusker, YP Huang, AS Kowligy, P Kumar
Interaction-free all-optical switching in χ(2)microdisks for quantum applications
We propose a quantum switch for telecom-band applications that is composed of a χ^(2) microdisk coupled to two fibers (or waveguides). The idea is to apply a pump pulse to shift the microdisk out of resonance, thereby switching the device between the cross and bar states in an interaction-free manner. As an example, a 2.5-μm-thick, 10μm radius GaAs microdisk with an intrinsic Q of ∼10^8 and a fiber-cavity-coupling Q of ∼10^4 can achieve low-loss (≲1%) switching for gigahertz-rate O-band quantum signals with milliwatt-peak-power pumps in the C band.
https://opg.optica.org/abstract.cfm?uri=ol-35-14-2376
YP Huang, P Kumar
Efficient electro-optical modulation on thin-film lithium niobate
Thin-film lithium niobate has emerged as an excellent, multifaceted platform for integrated photonics and opto-electronics, in both classical and quantum domains. We introduce a novel, to the best of our knowledge, dual-capacitor electrode layout for an efficient interface between electrical and optical signals on this platform. It significantly enhances the electro-optical modulation efficiency to an exceptional voltage–length product of 0.64V⋅cm, thereby lowering the required electric power by many times. This technique can boost the performance of growing applications at the interface of integrated electronics and optics, such as microwave photonics, frequency comb generation, and telecommunication transmission.
https://opg.optica.org/abstract.cfm?uri=ol-46-8-1884
M Jin, J Chen, Y Sua, P Kumar, Y Huang
Quantum frequency conversion in nonlinear microcavities
We study nonlinear microresonantors as potential implements for quantum frequency conversion of narrowband optical signals. Using silicon-nitride microdisks as a concrete example, we show that high-conversion performance can be achieved with relatively low pump power. Being chip integratable, such devices hold promise for use in large-scale quantum applications, including atomic-memory-based quantum repeaters.
https://opg.optica.org/abstract.cfm?uri=ol-38-12-2119
YP Huang, V Velev, P Kumar
Multichannel photon-pair generation using hydrogenated amorphous silicon waveguides
We demonstrate highly efficient photon-pair generation using an 8 mm long hydrogenated amorphous silicon (a-Si:H) waveguide in far-detuned multiple wavelength channels simultaneously, measuring a coincidence-to-accidental ratio as high as 400. We also characterize the contamination from Raman scattering and show it to be insignificant over a spectrum span of at least 5 THz. Our results highlight a-Si:H as a potential high-performance, CMOS-compatible platform for large-scale quantum applications, particularly those based on the use of multiplexed quantum signals.
https://opg.optica.org/abstract.cfm?uri=ol-39-4-914
KY Wang, VG Velev, KF Lee, AS Kowligy, P Kumar, MA Foster, AC Foster, ...
Photonic nonlinearities via quantum zeno blockade
Realizing optical-nonlinear effects at a single-photon level is a highly desirable but also extremely challenging task, because of both fundamental and practical difficulties. We present an avenue to surmounting these difficulties by exploiting quantum Zeno blockade in nonlinear optical systems. Considering specifically a lithium-niobate microresonator, we find that a deterministic phase gate can be realized between single photons with near-unity fidelity. Supported by established techniques for fabricating and operating such devices, our approach can provide an enabling tool for all-optical applications in both classical and quantum domains.
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.110.223901
YZ Sun, YP Huang, P Kumar
Antibunched emission of photon pairs via quantum zeno blockade
We propose a new methodology, namely, the “quantum Zeno blockade,” for managing light scattering at a few-photon level in general nonlinear-optical media, such as crystals, fibers, silicon microrings, and atomic vapors. Using this tool, antibunched emission of photon pairs can be achieved, leading to potent quantum-optics applications such as deterministic entanglement generation without the need for heralding. In a practical implementation using an on-chip toroidal microcavity immersed in rubidium vapor, we estimate that high-fidelity entangled photons can be produced on-demand at MHz rates or higher, corresponding to an improvement of≳ 10 7 times from the state-of-the-art.
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.108.030502
YP Huang, P Kumar
Interaction-Free Quantum Optical Fredkin Gates inMicrodisks
We present novel “interaction-free” realizations of quantum optical Fredkin gates that do not rely on direct physical coupling between the target light (signal) and the control light (pump). The interaction-free feature of such gates allow to overcome the fundamental limits of photon loss and quantum-state decoherence imposed by the signal-pump coupling. This advantage, together with the low inherent quantum-noise level in χ (2) microdisks, gives rise to substantially improved performance over the existing Fredkin-gate designs. Explicitly using lithium-niobate mircrodisks, we present two kinds of interaction-free Fredkin gates, a phase gate and an optical-path gate, both of which are designed with telecom-band applications in mind. For both gates, the threshold pump peak power to achieve a gate contrast >;100 and a signal loss <;10% is hundreds of microwatts for practical parameters of the devices.
https://ieeexplore.ieee.org/abstract/document/5740561/
YP Huang, P Kumar
Interaction-free all-optical switching via the quantum Zeno effect
We propose an interaction-free scheme for all-optical switching which does not rely on the physical coupling between signal and control waves. The interaction-free nature of the scheme allows it to overcome the fundamental photon-loss limit imposed by the signal-pump coupling. The same phenomenon protects photonic-signal states from decoherence, making devices based on this scheme suitable for quantum applications. Focusing on χ (2) waveguides, we provide device designs for traveling-wave and Fabry-Perot switches. In both designs, the performance is optimal when the signal switching is induced by coherent dynamical evolution. In contrast, when the switching is induced by a rapid dissipation channel, it is less efficient.
https://journals.aps.org/pra/abstract/10.1103/PhysRevA.82.063826
YP Huang, JB Altepeter, P Kumar
Ultra-wideband and high-gain parametric amplification in telecom wavelengths with an optimally mode-matched PPLN waveguide
We report a wideband optical parametric amplification (OPA) over 14 THz covering telecom S, C, and L bands with observed maximum parametric gain of 38.3 dB. The OPA is realized through cascaded second-harmonic generation and difference-frequency generation (cSHG-DFG) in a 2 cm periodically poled LiNbO_3 (PPLN) waveguide. With tailored cross section geometry, the waveguide is optimally mode matched for efficient cascaded nonlinear wave mixing. We also identify and study the effect of competing nonlinear processes in this cSHG-DFG configuration.
https://opg.optica.org/abstract.cfm?uri=ol-43-12-2965
YM Sua, JY Chen, YP Huang
Efficient frequency doubling with active stabilization on chip
Thin‐film lithium niobate (TFLN) is superior for integrated nanophotonics due to its outstanding properties in nearly all aspects: strong second‐order nonlinearity, fast and efficient electro‐optic effects, wide transparency window, and little two photon absorption and free carrier scattering. Together, they permit highly integrated nanophotonic circuits capable of complex photonic processing by incorporating disparate elements on the same chip. Yet, there has to be a demonstration that synergizes those superior properties for system advantage. Here, such a chip that capitalizes on TFLN's favorable ferroelectricity, high second‐order nonlinearity, and strong electro‐optic effects is demonstrated. It consists of a monolithic circuit integrating a Z‐cut, quasi‐phase matched microring with high quality factor and a phase modulator used in active feedback control. By Pound–Drever–Hall locking, it realizes stable frequency …
https://onlinelibrary.wiley.com/doi/abs/10.1002/lpor.202100091
JY Chen, C Tang, M Jin, Z Li, Z Ma, H Fan, S Kumar, YM Sua, YP Huang
Mode-selective frequency up-conversion in a chi (2) waveguide
We study sum-frequency generation (SFG) in a multimode PPKTP waveguide. We show that under proper quasi-phasematching, it can support one of the two scenarios. In the first, a single pump mode up-converts several different signal modes to different SFG modes. In the second, several different pairs of signal and pump modes are converted to the same SFG mode. By adjusting the relative phases and magnitudes of the pump modes, any superposition of the corresponding signal modes can be selected for up-conversion without affecting other modes, which can be used for spatial-mode de-multiplexing in both classical and quantum communications.
YB Kwon, M Vasilyev
Photon Conversion and Interaction in a Quasi-Phase-Matched Microresonator
The conversion and interaction between quantum signals at the single-photon level are essential for scalable quantum photonic information technology. Using a fully optimized periodically poled lithium niobate microring, we demonstrate ultraefficient sum-frequency generation on a chip. The external quantum efficiency reaches (65±3)% with only (104±4)-μ W pump power. At peak conversion, 3× 10− 5-noise photon is created during the cavity lifetime, which meets the requirement of quantum applications using single-photon pulses. Using a pump and signal in single-photon coherent states, we directly measure the conversion probability produced by a single pump photon to be 10− 5, which is a significant improvement from the state of the art, and the photon-photon coupling strength to be 9.1 MHz. Our results mark steady progress toward quantum nonlinear optics at the ultimate single-photon limit, with potential …
https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.16.064004
JY Chen, Z Li, Z Ma, C Tang, H Fan, YM Sua, YP Huang
Photon conversion in thin-film lithium niobate nanowaveguides: a noise analysis
Wavelength transduction of single-photon signals is indispensable to networked quantum applications, particularly those incorporating quantum memories. Lithium niobate nanophotonic devices have demonstrated favorable linear, nonlinear, and electro-optical properties to deliver this crucial function while offering superior efficiency, integrability, and scalability. Yet, their quantum noise level—a crucial metric for any single-photon-based application—has yet to be investigated. In this work, we report the first, to the best of our knowledge, study with the focus on telecom to near-visible conversion driven by a small detuned telecom pump for practical considerations in distributed quantum processing over fiber networks. Our results find the noise level to be on the order of 10^−4 photons per time-frequency mode for high conversion, allowing faithful pulsed operations. Through carefully analyzing the origins of such …
https://opg.optica.org/abstract.cfm?uri=josab-38-7-2172
H Fan, Z Ma, J Chen, Z Li, C Tang, YM Sua, Y Huang
Progress towards interaction-free all-optical devices
We present an all-optical control device in which coupling a weak control optical field into a high-Q lithium niobate whispering-gallery-mode microcavity decouples it from a signal field due to nonlinear optical interactions. This results in switching and modulation of the signal with low-power control pulses. In the quantum limit, the underlying nonlinear-optical process corresponds to the quantum Zeno blockade. Its “interaction-free” nature effectively alleviates loss and decoherence for the signal waves. This work therefore presents experimental progress towards acquiring large phase shifts with few photons or even at the single-photon level.
https://journals.aps.org/pra/abstract/10.1103/PhysRevA.89.063820
DV Strekalov, AS Kowligy, YP Huang, P Kumar
Low-loss all-optical quantum switching
We present a two-input, two-output, single-photon switch prototype that is capable of achieving insertion loss <; 0.6 dB and switching speed > 5 GHz.
https://ieeexplore.ieee.org/abstract/document/6614561/
TM Rambo, K McCusker, YP Huang, P Kumar
Phase matching for the optical frequency conversion processes in whispering gallery mode resonators
Optical nonlinear processes in whispering gallery mode resonators require the phase matching that is profoundly different from that in bulk crystals or waveguides. We analyze the phase matching conditions for frequency doubling and parametric down conversion in the resonators, and find the configurations allowing for simultaneous occurrence of these two processes. Such double phase matching gives us access to a variety of interesting quantum nonlinear optical phenomena. For example, it can lead to antibunched emission of photon pairs through the quantum Zeno photonic blockade.
https://www.tandfonline.com/doi/abs/10.1080/09500340.2015.1063726
DV Strekalov, AS Kowligy, VG Velev, GS Kanter, P Kumar, YP Huang
Spatial-mode-selective quantum frequency conversion in nonlinear waveguides
We investigate spatial-mode-selective frequency up-converters of quantum states from infrared to visible region, which could be useful not only for interfacing the optical fiber links with quantum memories and for increasing the photon detection efficiency, but also for classical demultiplexing of spatial modes that are otherwise difficult to discriminate in both spatial and spatial-frequency domains. We consider two approaches: first, based on sum-frequency generation (SFG) in 2D free space, and second, based on SFG in a multimode waveguide with 2D confinement. For the latter approach, we find that under proper quasi-phase-matching arrangement, several different pairs of signal and pump modes are converted to the same SFG mode. By adjusting the relative phases and magnitudes of the pump modes, any superposition of the corresponding signal modes can be selected for up-conversion without affecting other …
YB Kwon, M Vasilyev
Observation of quantum zeno blockade on chip
Overlapping in an optical medium with nonlinear susceptibilities, lightwaves can interact, changing each other’s phase, wavelength, waveform shape, or other properties. Such nonlinear optical phenomena, discovered over a half-century ago, have led to a breadth of important applications. Applied to quantum-mechanical signals, however, these phenomena face fundamental challenges that arise from the multimodal nature of the interaction between the electromagnetic fields, such as phase noises and spontaneous Raman scattering. The quantum Zeno blockade allows strong interaction between lightwaves without physical overlap between them, thus offering a viable solution for the aforementioned challenges, as indicated in recent bulk-optics experiments. Here, we report on the observation of quantum Zeno blockade on chip, where a lightwave is modulated by another in a distinct “interaction-free” manner. For …
https://www.nature.com/articles/s41598-017-13327-x
JY Chen, YM Sua, ZT Zhao, M Li, YP Huang
Chip-integrated device and methods for generating random numbers that is reconfigurable and provides genuineness verification
A device for generation of genuine random numbers, uses quantum stochastic processes in optical parametric nonlinear media. The dimensionality of the random numbers is varied from 2 to over 100,000. Their statistical properties, including the correlation function amongst random numbers, are tailored using linear and nonlinear optical circuits following the parametric nonlinear media. Both the generation and manipulation of random numbers are integrated on a single nanophotonics chip. By incorporating optoelectric effects, fast streams of random numbers are created in custom statistical properties, which are updated or reconfigured in real time, such as at 10 GHz speed. The unpredictability of the random numbers is quantifying by evaluating their min-entropy. The genuineness of quantum random numbers is tested using both statistical tools and independently verified by measuring the quantum entanglement …
https://patents.google.com/patent/US11442697B2/en
Y Huang, YM Sua, J Chen, LTT Nguyen
Spatial-mode-selective quantum frequency conversion in a χ (2) slab waveguide
We numerically investigate single-spatial-mode-selective up-conversion in a diffractionless χ (2) slab waveguide by optimizing its one-dimensional pump profile. Singular-value decomposition of the Green’s function predicts~ 5-dB discrimination between the first two modes’ conversion efficiencies.
https://opg.optica.org/abstract.cfm?uri=qim-2014-JW2A.52
M Vasilyev, YB Kwon, YP Huang
Fredkin gates in χ (2) microdisks via quantum zeno blockade
Using the quantum Zeno effect, we present a quantum optical Fredkin gate in LiNbO 3 microdisks for telecom applications. Such gates can operate with sub-femtojoule pumps and, in the ideal limit, without any energy dissipation.
https://opg.optica.org/abstract.cfm?uri=NLO-2011-NWE1
YP Huang, P Kumar
Phase-sensitive amplification in nanophotonic periodically poled lithium niobate waveguides
We demonstrate phase-sensitive amplification in periodically poled lithium niobate nanowavguides, achieving a net gain of 11.8 dB and an extinction ratio of 14.9 dB for 1.2-ps pump pulse with 2.4-pJ pulse energy.
https://opg.optica.org/abstract.cfm?uri=CLEO_SI-2020-SM3L.5
JY Chen, YM Sua, Z Ma, L Nguyen, YP Huang
Broadband photon pair generation in green fluorescent proteins through spontaneous four-wave mixing
Recent studies in quantum biology suggest that quantum mechanics help us to explore quantum processes in biological system. Here, we demonstrate generation of photon pairs through spontaneous four-wave mixing process in naturally occurring fluorescent proteins. We develop a general empirical method for analyzing the relative strength of nonlinear optical interaction processes in five different organic fluorophores. Our results indicate that the generation of photon pairs in green fluorescent proteins is subject to less background noises than in other fluorophores, leading to a coincidence-to-accidental ratio ~145. As such proteins can be genetically engineered and fused to many biological cells, our experiment enables a new platform for quantum information processing in a biological environment such as biomimetic quantum networks and quantum sensors.
https://www.nature.com/articles/srep24344
S Shi, A Thomas, NV Corzo, P Kumar, Y Huang, KF Lee
Photon Conversion and Interaction on Chip
The conversion and interaction between quantum signals at a single-photon level are essential for scalable quantum photonic information technology. Using a fully-optimized, periodically-poled lithium niobate microring, we demonstrate ultra-efficient sum-frequency generation on chip. The external quantum efficiency reaches with only W pump power, improving the state-of-the-art by over one order of magnitude. At the peak conversion, noise photon is created during the cavity lifetime, which meets the requirement of quantum applications using single-photon pulses. Using pump and signal in single-photon coherent states, we directly measure the conversion probability produced by a single pump photon to be -- breaking the record by 100 times -- and the photon-photon coupling strength to be 9.1 MHz. Our results mark a new milestone toward quantum nonlinear optics at the ultimate single photon limit, creating new background in highly integrated photonics and quantum optical computing.
https://arxiv.org/abs/2105.00275
JY Chen, Z Li, Z Ma, C Tang, H Fan, YM Sua, YP Huang
Programmable Spatiotemporal Quantum Parametric Mode Sorter
We experimentally demonstrate a programmable parametric mode sorter of high-dimensional signals in a composite spatiotemporal Hilbert space through mode-selective quantum frequency up-conversion. As a concrete example and with quantum communication applications in mind, we consider the Laguerre-Gaussian and Hermite-Gaussian modes as the spatial and temporal state basis for the signals, respectively. By modulating the spatiotemporal profiles of the up-conversion pump, we demonstrate the faithful selection of signal photons in those modes and their superposition modes. Our results show an improvement in the quantum mode-sorting performance by coupling the up-converted light into a single-mode fiber and/or operating the up-conversion at the edge of phase matching. Optimizing pump temporal profiles allows us to achieve more than 12-dB extinction for mutually unbiased basis (MUB) sets of …
https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.19.044070
M Garikapati, S Kumar, H Zhang, YM Sua, YP Huang
Highly mode-selective quantum frequency conversion in a slab waveguide
We analyze sum-frequency generation (SFG) in a χ(2) slab waveguide with the goal of achieving a single spatial-mode operation. We first develop Green’s function formalism for the SFG equations and then perform singular-value decomposition (SVD) of the Green’s function. By adjusting the spatial profile of the pump, we manipulate the SVD spectrum to maximize the up-conversion of one signal mode while minimizing the up-conversion of all others, which opens a possibility of realizing a spatial-mode-selective quantum frequency converter for future optical communications.
M Vasilyev, YB Kwon, YP Huang
Photon-pair generation in a heterogeneous silicon photonic chip
We perform photon-pair generation in a heterogeneous multi-layer silicon photonic chip consisting of SiN x and a-Si:H waveguides. Record high CAR value of 1632.6 (± 260.4) is achieved in a-Si:H waveguides from the heterogeneous design.
https://ieeexplore.ieee.org/abstract/document/9891503/
N MacFarlane, M Jin, Z Ma, Y Sua, MA Foster, AC Foster, Y Huang
Efficient electro-optical modulation on thin-film lithium niobate: erratum
In this erratum, we correct the corresponding results of our Letter [Opt. Lett.46, 1884 (2021)OPLEDP0146-959210.1364/OL.419597] due to the wrong impedance setting of the arbitrary waveform generator (AWG). The Letter still represents the significant advance despite the change of results.
https://opg.optica.org/abstract.cfm?uri=ol-46-18-4601
M Jin, J Chen, Y Sua, P Kumar, Y Huang
Selective up-conversion of two orthogonal signal modes using shaped pump pulses
We demonstrate selective up-conversion of two orthogonal signal modes occupying the same time bin using temporally shaped pump pulses. Measured selectivities (8.4 and 4.2 dB) agree with simulation results that take device parameters into account.
https://opg.optica.org/abstract.cfm?uri=FiO-2014-FTh1B.3
P Manurkar, NV Corzo, P Kumar, GS Kanter, YP Huang
Ultra-bright biphoton emission from an atomic vapor based on Doppler-free four-wave-mixing and collective emission
We propose a novel `butterfly' level scheme to generate highly correlated photon pairs from atomic vapors. With multi-photon Doppler-free pumping, background Rayleigh scattering is dipole-forbidden and collective emission is permitted in all directions. This results in usable pairs generated simultaneously in the full solid angle. Collecting these pairs can produce photon pairs at a rate of per second, given only moderate ensemble sizes of atoms.
https://arxiv.org/abs/0901.4789
YP Huang, MG Moore
Efficient frequency doubling with active stabilization on chip (2021)
https://scholar.google.com/scholar?cluster=9753798779810594400&hl=en&oi=scholarr
JY Chen, C Tang, M Jin, Z Li, Z Ma, H Fan, S Kumar, YM Sua, YP Huang
Efficient Photon Pair Generation in Thin-film Lithium Niobate Microring Resonators
We demonstrate a high purity photon pair source via parametric downcon-version in a chip-integrated lithium niobate racetrack microring resonator, observing high brightness of 6.4 MHz mW− 1 GHz− 1 at 2350 coincidence-to-accidental ratio.
https://opg.optica.org/abstract.cfm?uri=quantum-2020-QM6B.2
Z Ma, JY Chen, YM Sua, Z Li, C Tang, YP Huang
Efficient second-harmonic generation in sub-micron ppln waveguides
Efficient second-harmonic generation (SHG) is demonstrated in sub-micron periodically poled lithium niobate waveguides with normalized conversion efficiencies over 440% W− 1 cm− 2.
https://opg.optica.org/abstract.cfm?uri=ls-2018-JTu2A.87
JY Chen, YM Sua, Z Ma, C Tang, Z Li, YP Huang
Laser Science, JTu2A. 87 1 2018
Corrigendum: Optical sum-frequency generation in a whispering-gallery-mode resonator (2015) New J. Phys. 16 053025
Corrigendum: Optical sum-frequency generation in a whispering-gallery-mode resonator (2015 New J. Phys. 16 053025) Page 1 CORRIGENDUM • OPEN ACCESS Corrigendum: Optical sum-frequency generation in a whispering-gallery-mode resonator (2015 New J. Phys. 16 053025) To cite this article: Dmitry V Strekalov et al 2015 New J. Phys. 17 099501 View the article online for updates and enhancements. You may also like Corrigendum: Inverse problems for the perturbed polyharmonic operator with coefficients in Sobolev spaces with nonpositive order (2016 Inverse Problems 32 105009) Yernat M Assylbekov - Magnetic Field of a Compact Spherical Star under f(R, T) Gravity Safiqul Islam and Shantanu Basu - Anharmonic, dimensionality and size effects in phonon transport (2017 J. Phys.: Condens. Matter 29 505703) Iorwerth O Thomas and GP Srivastava - This content was downloaded from IP address …
https://iopscience.iop.org/article/10.1088/1367-2630/17/9/099501/meta
DV Strekalov, AS Kowligy, YP Huang, P Kumar
New Journal of Physics 17 (9), 099501 1 2015
Natural phase matching in microdisk cavities
We identify new approaches to achieve natural phase matching in microdisk cavities for widely-spaced wavelengths across the visible and telecom bands.
https://opg.optica.org/abstract.cfm?uri=CLEO_AT-2014-JTh2A.72
V Velev, P Kumar, YP Huang
CLEO: Applications and Technology, JTh2A. 72 1 2014
Self-stabilized quantum optical Fredkin gate enabled by the Raman effect
We demonstrate a quantum optical Fredkin gate in an all-fiber setup, which is self-stabilizing against pump fluctuations owing to stimulated Raman scattering occurring naturally in such a system.
https://ieeexplore.ieee.org/abstract/document/6833884/
J Hu, YP Huang, P Kumar
CLEO: 2013, 1-2 1 2013
Observation of Quantum Zeno Blockade in χ (2) Microresonators
We report observing all-optical modulation with a contrast of 80% via quantum Zeno blockade in a Lithium Niobate whispering-gallery-mode resonator at a pump peak power of 100µW.
https://opg.optica.org/abstract.cfm?uri=CLEO_QELS-2013-QTu3C.4
DV Strekalov, A Kowligy, YP Huang, P Kumar
CLEO: QELS_Fundamental Science, QTu3C. 4 1 2013
Direct measurement of third-order nonlinearity of green fluorescent protein
We present the measurement of χ (3) nonlinearity of Green Fluorescent Protein. The nonlinear index is n 2= 10− 19 m 2/W, opening the possibility of using genetically engineerable and naturally occuring proteins in cells as a source of four wave mixing experiments.
https://opg.optica.org/abstract.cfm?uri=CLEO_AT-2013-JW2A.01
A Thomas, YP Huang, TM Rambo, S Shi, JB Altepeter, P Kumar
CLEO: Applications and Technology, JW2A. 01 1 2013
Ultrabright omnidirectional collective emission of correlated photon pairs from atomic vapors
Spontaneous four-wave mixing can generate highly correlated photon pairs from atomic vapors. We show that multiphoton pumping of dipole-forbidden transitions in a recoil-free geometry can result in ultrabright pair emission in the full 4 π solid angle, while strongly suppressing background Rayleigh scattering and associated atomic heating, Such a system can produce photon pairs at rates of~ 10 12 per second, given only moderate optical depths of 10− 100, or alternatively, the system can generate paired photons with subnatural bandwidths at lower production rates. We derive a rate-equation based theory of the collective atomic population and coherence dynamics and present numerical simulations for a toy model, as well as realistic model systems based on Cs 133 and Yb 171 level structures. Last, we demonstrate that dark-state adiabatic following electromagnetically induced transparency and/or time-scale …
https://journals.aps.org/pra/abstract/10.1103/PhysRevA.81.033807
YP Huang, MG Moore
Physical Review A 81 (3), 033807 1 2010
Highly efficient and pure few-photon source on chip
We report on multiphoton statistics of correlated twin beams produced in a periodic poled microring resonator on thin-film lithium niobate. Owing to high-cavity confinement and near-perfect quasi-phase-matching, the photon pairs are produced efficiently in single modes at rates reaching 27 MHz per μ W pump power. By using a pump laser whose pulse-width impedance matches with the cavity, those photons are further created in single longitudinal modes with purity reaching 99%, without relying on later-on filtering. With a dual-channel photon-number-resolving detection system, we obtain directly the joint detection probabilities of multiphoton states up to three photons, with high coincidence to accidental contrast for each. Used as a single-photon source, it gives heralded g H (2)(0) around 0.04 at a single-photon rate of 650 kHz on chip. The findings of our research highlight the potential of this nanophotonic …
https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.20.044033
Z Ma, JY Chen, M Garikapati, Z Li, C Tang, YM Sua, YP Huang
Physical Review Applied 20 (4), 044033 2023
Devices and methods for giant single-photon nonlinearities
A periodically poled microring resonator structure, a method for fabrication of the periodically poled microring resonator structure, and a method to achieve giant single-photon nonlinearity are disclosed. The strong single-photon nonlinearity in the microring resonator structure is achieved through its optimized design and fabrication procedures.
https://patents.google.com/patent/US11754908B2/en
Y Huang, J Chen
US Patent 11,754,908 2023
DEVICES AND METHODS FOR LOW VOLTAGE OPTICAL MODULATION
An electro-optic modulation structure 110, a method for fabrication of the electro-optic modulation structure, and a method of optical modulation derived from an electro-optic modulation structure with low voltage of operation are disclosed. The low voltage operation of the electro-optic modulator is realized by designed electro-optic modulation structures that include the light confining waveguide 114, overclad layer 120 and modulating electrode structure 116 for applying modulation voltages that are directed towards a low voltage operation of the electro-optic modulation 110 device upon consideration of optimal optical loss.
https://patents.google.com/patent/US20230185119A1/en
Y Huang, YM Sua, M Jin, J Chen
US Patent App. 17/923,554 2023
Photon-Pair Generation in a Heterogeneous Nanophotonic Chip
Integrated silicon photonics has played an important role in advancing the applications of quantum information and quantum science. However, it is challenging to integrate all components with state-of-the-art performance using only a homogeneous platform. Here, by combining high nonlinearity and low losses in a heterogeneous silicon platform, we efficiently generate high-quality photon pairs through spontaneous four-wave mixing in a hydrogenated amorphous silicon waveguide and route them off-chip through a low-loss silicon nitride waveguide. A record high coincidence-to-accidental ratio value of 1632.6 (±260.4) is achieved in this heterogeneous design with a photon pair generation rate of 1.94 MHz. We also showcase a wide range of multichannel photon sources with a coincidence-to-accidental ratio consistently around 200. Lastly, we measure heralded single-photons with the lowest gH(2)(0) of 0.1085 …
https://pubs.acs.org/doi/abs/10.1021/acsphotonics.3c00394
M Jin, N MacFarlane, Z Ma, YM Sua, M Foster, Y Huang, A Foster
ACS Photonics 2023
Doubly Phase Matched Wavelength Conversion in Thin-film Lithium Niobate Nanowaveguides
We demonstrate double-peak quasi-phasing matching for second-harmonic generation with high efficiency by engineering periodic poling. The results show the potential of multi-channel nonlinear optical processing on chip.
https://ieeexplore.ieee.org/abstract/document/10258765/
C Tang, S Zhu, Z Ma, Z Li, YM Sua, YP Huang
2023 Conference on Lasers and Electro-Optics (CLEO), 1-2 2023
Oxygen A-band absorption spectroscopy with solar photon counting and lithium niobate nanophotonic circuits
Oxygen A-band measurements can provide important information about cloud top height, cloud physical and optical thickness, and surface atmospheric pressure. So far, O2 A-band measurements are typically made with spectrometers at a spectral resolution of 40 pm (such as in the OCO-2 satellite) or a coarser resolution. This paper reports a new CubeSat measurement concept with higher spectral resolution over the O2 A-band using integrated photonic circuits and solar photon counting techniques. An integrated Micro-ring filter (MRR) chip with 10~pm resonant linewidth with an extinction ratio of 25 dB or higher is designed, fabricated, and used for precise measurements of the atmospheric oxygen A-band absorption line-shapes around 770 nm. With solar-photon counting and using a narrow-band filter made of an integrated, fast-swept MRR on LNOI, we have demonstrated a high-resolution measurement of the O2 A-band absorption spectrum, exhibiting good agreement with the HITRAN database.
https://www.frontiersin.org/articles/10.3389/frsen.2022.1064244/full
J Zhang, YM Sua, Y Hu, J Ramanathan, YP Huang
Frontiers in Remote Sensing 3, 1064244 2022
Photon-pair generation in a heterogeneous silicon photonic chip
Integrated Silicon photonics has played an important role in advancing the applications of quantum information and quantum science. However, due to different material properties, it is challenging to integrate all components with excellent performance based on homogeneous material. Here, by combining high nonlinearity and low losses in a heterogeneous silicon platform, we efficiently generate high-quality photon pairs through spontaneous four-wave mixing in hydrogenated amorphous silicon waveguide and route them off-chip through low loss silicon nitride waveguide. A record high coincidence- to- accidental rate value of 1632.6 ( 260.4) is achieved in this heterogeneous design with a photon pair generation rate of 1.94 MHz. We also showcase a wide range of multi-channel photon sources with coincidence- to- accidental rate consistently at 200. Lastly, we measure heralded single-photons with a lowest of 0.1085 0.0014. Our results demonstrate the heterogeneous silicon platform as an ideal platform for efficient generation of photon pairs and routing them off-chip with low losses. It also paves a way for the future hybrid photonic integrated circuit by collecting distinct features from different materials.
https://arxiv.org/abs/2208.13955
M Jin, N MacFarlane, Z Ma, Y Sua, MA Foster, Y Huang, AC Foster
arXiv preprint arXiv:2208.13955 2022
Devices and methods for giant single-photon nonlinearities
A periodically poled microring resonator structure, a method for fabrication of the periodically poled microring resonator structure, and a method to achieve giant single-photon nonlinearity are disclosed. The strong single-photon nonlinearity in the microring resonator structure is achieved through its optimized design and fabrication procedures.
https://patents.google.com/patent/US20220075238A1/en
Y Huang, J Chen
US Patent App. 17/468,182 2022
Atmospheric Carbon Dioxide Absorption Measurement using Integrated Lithium Niobate Nanophotonics
We use photon counting and a sweeping high-Q microring on chip to obtain the atmospheric carbon dioxide absorption spectrum around 1572.022 nm.
https://opg.optica.org/abstract.cfm?uri=CLEO_AT-2021-AW2S.5
J Zhang, YM Sua, J Chen, J Ramanathan, C Tang, Y Hu, YP Huang
CLEO: Applications and Technology, AW2S. 5 2021
Frequency Conversion and Anti-Parity-Time Symmetry Effect in Nanophotonic Thin Film Lithium Niobate Waveguide
Lithium niobate has been the one of most attractive optical and photonic materials since its exceptional performance in linear and nonlinear optics, including wide transparent window, relatively high quadratic nonlinear coefficient and strong electro-optic response. The commercialization of lithium niobate already impacts our daily life, for example, electro-optic modulator made of bulk lithium niobate has been the rock bed for nowadays information society. However, the development of Thin Film Lithium Niobate (TFLN) has lagged other nanophotonic platforms, such as silicon nitride and silicon, due to the notorious difficulty of material processing and nanofabrication. In the past five years, our lab overcame the nanofabrication difficulty in TFLN, and could routinely fabricate ultra-low propagation loss, less than 0.1 dB/cm, nanophotonic TFLN waveguide. In this dissertation, I will leverage our advantage with enhanced …
H Fan
Stevens Institute of Technology 2021
Discriminative remote sensing and surface profiling based on superradiant photonic backscattering
Disclosed is a system and method for remote sensing, surface profiling, object identification, and aiming based on two-photon population inversion and subsequent photon backscattering enhanced by superradiance using two co-propagating pump waves. The present disclosure enables efficient and highly-directional photon backscattering by generating the pump waves in properly pulsed time-frequency modes, proper spatial modes, with proper group-velocity difference in air. The pump waves are relatively delayed in a tunable pulse delay device and launched to free space along a desirable direction using a laser-pointing device. When the pump waves overlap in air, signal photons will be created through two-photon driven superradiant backscattering if target gas molecules are present. The backscattered signal photons propagate back, picked using optical filters, and detected. By scanning the relative delay …
https://patents.google.com/patent/US10819081B2/en
Y Huang
US Patent 10,819,081 2020
Observation of Anti-parity-time Symmetry on Chip
We report an on-chip realization of non-Hermitian optics with anti-Parity-Time (Anti-PT) symmetry by constructing a fully-passive, nanophotonic platform consisting of three evanescently-coupled nanowaveguides.
https://opg.optica.org/abstract.cfm?uri=FiO-2020-FTu8E.6
H Fan, J Chen, Z Zhao, J Wen, Y Huang
Frontiers in Optics, FTu8E. 6 2020
Ultra-efficient and highly tunable frequency conversion in Z-cut periodically poled lithium niobate nanowaveguides
We demonstrate ultra-efficient (~ 1900 ± 500%W -1 cm -2 ) and highly tunable (~ 1.71 nm/K) second harmonic generation from 1530 to 1583 nm via type-0 phase matching in Z-cut periodically poled lithium niobate nanowavguides.
https://ieeexplore.ieee.org/abstract/document/9192986/
JY Chen, C Tang, Z Ma, Z Li, YM Sua, YP Huang
2020 Conference on Lasers and Electro-Optics (CLEO), 1-2 2020
Ultra-efficient and highly-tunable second-harmonic generation in Z-cut periodically poled lithium niobate nanowaveguides
JY Chen, C Tang, ZH Ma, Z Li, YM Sua, YP Huang
arXiv preprint arXiv:2004.02056 2020
Efficient quasi-phase-matched frequency conversion in a lithium niobate racetrack microresonator
We demonstrate efficient second harmonic generation in a quasi-phase-matched, high quality factor (Q 0≈ 5. 3× 10 5) racetrack microresonator. The observed normalized conversion efficiency is about 3. 8% mW− 1.
https://opg.optica.org/abstract.cfm?uri=CQO-2019-W5A.11
JY Chen, Z Ma, YM Sua, YP Huang
Conference on Coherence and Quantum Optics, W5A. 11 2019
High-dimensional temporal mode propagation in a turbulent environment
Temporal modes of photonic quantum states provide a new framework to develop a robust free-space quantum key distribution (QKD) scheme in a maritime environment. We show that the high-dimensional temporal modes can be used to fulfill a persistent communication channel to achieve high photon-efficiency even in severe weather conditions. We identify the parameter regimes that allow for a high-fidelity quantum information transmission. We also examine how the turbulent environment affects fidelity and entanglement degree in various environmental settings.
https://arxiv.org/abs/1907.02321
Q Ding, R Chatterjee, Y Huang, T Yu
arXiv preprint arXiv:1907.02321 2019
Naturally phase matched waveguides and microrings on lithium niobate-on-insulator (LNOI)
We demonstrate naturally phase matched waveguides and microrings on chip for second-harmonic generation (SHG) with submicron transverse mode confinement.
https://opg.optica.org/abstract.cfm?uri=FiO-2018-JTu3A.100
JY Chen, YM Sua, H Fan, YP Huang
Frontiers in Optics, JTu3A. 100 2018
Ultra-wideband parametric amplification in telecom wavelengths with an optimally mode-matched PPLN waveguide
Ultra-wideband parametric amplification over 14 THz in the telecom band is realized via cascaded nonlinear processes in an optimally mode-matched PPLN waveguide. With a tailored waveguide cross-section, we observe a maximum gain of 38.3 dB.
https://opg.optica.org/abstract.cfm?uri=fio-2018-FW5B.2
YM Sua, JY Chen, YP Huang
Frontiers in Optics, FW5B. 2 2018
Naturally Phase Matched Lithium Niobate Nanocircuits for Integrated Nonlinear Photonics
High complexity, dense integrated nanophotonic circuits possessing strong nonlinearities are desirable for a breadth of applications in classical and quantum optics. In this work, we study natural phase matching via modal engineering in lithium niobate (LN) waveguides and microring resonators on chip for second harmonic generation (SHG). By carefully engineering the geometry dispersion, we observe a normalized efficiency for SHG in a waveguide with submicron transverse mode confinement. With similar cross-sectional dimensions, we demonstrate phase matched SHG in a microring resonator with 10 times enhancement on the out-coupled second-harmonic power. Our platform is capable of harnessing the strongest optical nonlinear and electro-optic effects in LN on chip with unrestricted planar circuit layouts. It offers opportunities for dense and scalable integration of efficient photonic devices with low loss and high nonlinearity.
https://arxiv.org/abs/1805.11476
JYC Sua, Y Meng, H Fan, Y Huang
arXiv preprint arXiv:1805.11476 2018
Interaction-free All-optical Modulation on Chip
We report the observation of quantum Zeno blockade on chip, where a lightwave is modulated by another in a distinct “interaction-free” manner. For quantum applications, we also verify its operations on single photons.
https://opg.optica.org/abstract.cfm?uri=FiO-2017-JW4A.12
JY Chen, YM Sua, ZT Zhao, M Li, YP Huang
Frontiers in Optics, JW4A. 12 2017
On-Chip Demonstration of Interaction-free Quantum Switching
Quantum Zeno blockade allows all-optical switching in a counterintuitive “interaction-free” manner. Using a lithium-niobate microdisk cavity nanofabricated on chip, we have observed phase matched sum-frequency generation and interaction-free switching between optical pulses in two tightly confined whispering-gallery modes. We have also verified that our device is suitable for nonlinear operations in a single-photon regime. Our results point to a scalable, chip-integrated platform for nonlinear optics extendable to the quantum regime.
https://opg.optica.org/abstract.cfm?uri=NLO-2017-NM2A.5
JY Chen, YM Sua, Z Zhao, M Li, YP Huang
Nonlinear Optics, NM2A. 5 2017
Generation of Photon Pairs in Green Fluorescent Protein
We demonstrate generation of correlated photon pairs in naturally occurring Green Fluorescent Protein through the process of nondegenerate four-wave mixing. We obtain high purity photon pairs with a maximum coincidence to accidental ratio of~ 70.
https://opg.optica.org/abstract.cfm?uri=fio-2014-FW1C.3
S Shi, A Thomas, NV Corzo, P Kumar, YP Huang, KF Lee
Frontiers in Optics, FW1C. 3 2014
Interaction-free All-optical Switches for Quantum Applications
We present a realization of all-optical switching in whispering-gallery-mode microcavities. Operating without the control and probe light beams overlapping in the cavity (in the asymptotic limit), such switches are ideal for use with quantum signals.
https://opg.optica.org/abstract.cfm?uri=fio-2014-FM4B.2
YP Huang, AS Kowligy, YZ Sun, DV Strekalov, P Kumar
Frontiers in Optics, FM4B. 2 2014
Experimental Demonstration of All-Optical Switching Using the Quantum Zeno Effect
We experimentally demonstrate interaction-free all-optical switching via the quantum Zeno effect. The switch contrast is 35: 1, and the experimental data matches a parameter-free fit. We discuss possible applications and future extensions.
https://opg.optica.org/abstract.cfm?uri=QIM-2013-Th4A.2
KT McCusker, YP Huang, AS Kowligy, P Kumar
Quantum Information and Measurement, Th4A. 2 2013
Entanglement-preserving photonic switching: Demonstration of full cross-bar operation with 25-GHz capability
We present an all-optical, fiber-based quantum switch that operates at high speeds with low loss and—most importantly—retains the incident photons’ quantum state, thereby making it useful for applications in quantum communications.
https://opg.optica.org/abstract.cfm?uri=NFOEC-2013-JTh2A.22
NN Oza, YP Huang, P Kumar
National Fiber Optic Engineers Conference, JTh2A. 22 2013
All-optical quantum switching
We will present progress in ultrafast all-optical quantum switching. c (3)-based devices can route entangled photons without disturbing their quantum state, whereas c (2)-based devices can, in principle, lead to dissipation-free quantum-optical Fredkin gates.
https://opg.optica.org/abstract.cfm?uri=Photonics-2012-W1C.1
P Kumar, YP Huang
International Conference on Fibre Optics and Photonics, W1C. 1 2012
Ultrafast switching of photonic entanglement
We present our recent development of fiber-optic technology for all-optical switching and routing of entangled photons at high speeds, with minimal loss and added in-band noise, and-most importantly-without disturbing the photons' quantum state.
https://ieeexplore.ieee.org/abstract/document/6358668/
NN Oza, YP Huang, P Kumar
IEEE Photonics Conference 2012, 413-414 2012
Quantum information processing in the telecom waveband
We present recent progress in all-optical routing of entangled single photons at high speeds, with minimal loss and added in-band noise, and-most importantly-without disturbing the photons' quantum state.
https://ieeexplore.ieee.org/abstract/document/6476434/
P Kumar, YP Huang, JB Altepeter, M Patel, NN Oza, MA Hall
OFC/NFOEC, 1-3 2012
Interaction-Free All-Optical Switching via Quantum Zeno Blockade
Embedding a χ (2) crystal in a Fabry-Perot cavity, we propose and demonstrate an all-optical switch via quantum Zeno blockade that is implemented without any physical coupling between the signal and pump waves.
https://opg.optica.org/abstract.cfm?uri=fio-2011-FThS2
YP Huang, AS Kowligy, JB Altepeter, P Kumar
Frontiers in Optics, FThS2 2011
Mixing light and matter waves: Principles and applications
The work of this dissertation is committed to theoretically explore rich physics involving quantum-mechanical mixing of light and matter waves, while specifically seeking applications in the fields of quantum interferometry, quantum information processing, and testing fundamental quantum mechanics. Towards this goal, the present research is guided by two lines. The first line is to study and manipulate collective behaviors of multi-atom systems at quantum-degenerate temperature, where the wave nature of atoms is maximized. Specifically, a variety of phase-coherent mixing processes of two macroscopic matter-waves, in the form of gaseous Bose-Einstein condensate (BEC), are investigated and engineered via (i) tuning atomic collisional interaction and/or inter-wave tunneling rate;(ii) mixing with optical waves of phase-locked lasers. By these means, a series of novel applications are proposed for generating highly …
Y Huang
Michigan State University 2009
Interaction-and measurement-free quantum information processing with single-atom and/or single-photon qubits
Interaction-free measurement (IFM) uses quantum interference to allow a single photon to detect a perfectly absorbing object without the photon interacting with the object directly. In high-efficiency IFM, the Quantum Zeno Effect is employed to increase the success probability from the original 50% to (Na)/N, where N is the number of cycles the photon makes through the device and a 1. In principle IFM protocols allow the hyperfine state of a single atom to become entangled with the polarization of a single photon. To date, attempts to employ this entanglement to create universal atom-atom quantum logic gates, such as CNOT gates, have not succeeded in achieving (Na)/N efficiency. In addition, they also require the detection of ancillary photons. At present, single-photon detection cannot be implemented experimentally with high efficiency. By making several key modications, we have developed a pair of …
https://ui.adsabs.harvard.edu/abs/2007APS..DMP.W5002M/abstract
M Moore, Y Huang
APS Division of Atomic, Molecular and Optical Physics Meeting Abstracts 38 … 2007
Measuring an unknown phase with quantum-limited precision using nonlinear beamsplitters
High precision phase measurement is currently a central goal of quantum interferometry. In general, the precision is described by the phase estimation uncertainty δθ, which is characterized by two scaling behaviors, shot-noise limited with δθ∼ 1/√ N and Heisenberg limited with δθ∼ 1/N (N the total particle number). According to Bayesian analysis, Heisenberg limited preciosion for θ= 0 can be achieved in a Mach-Zehnder interferometer with (| N-1, N+ 1>+| N+ 1, N-1>)/√ 2 as input state based and a single measurement or| N, N> input based on multiple measurements. As θ deviates from zero, both schemes degrade rapidly to worse than shot-noise-limited precision. In contrast, a Quantum Fourier Transform (QFT) based interferometer can measure an arbitrary θ at Heisenberg limited precision, but requires a quantum computer. To extend the range of precisely measurable θ without a quantum computer, we …
https://ui.adsabs.harvard.edu/abs/2007APS..DMP.W5001H/abstract
Y Huang, M Moore
APS Division of Atomic, Molecular and Optical Physics Meeting Abstracts 38 … 2007