Nonlinear photonics
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, ...
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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