Reservoir computing
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
Single-pixel pattern recognition with coherent nonlinear optics
In this Letter, we propose and experimentally demonstrate a nonlinear-optics approach to pattern recognition with single-pixel imaging and a deep neural network. It employs mode-selective image up-conversion to project a raw image onto a set of coherent spatial modes, whereby its signature features are extracted optically in a nonlinear manner. With 40 projection modes, the classification accuracy reaches a high value of 99.49% for the modified national institute of standards and technology handwritten digit images, and up to 95.32%, even when they are mixed with strong noise. Our experiment harnesses rich coherent processes in nonlinear optics for efficient machine learning, with potential applications in online classification of large-size images, fast lidar data analyses, complex pattern recognition, and so on.
https://opg.optica.org/abstract.cfm?uri=ol-45-24-6771
T Bu, S Kumar, H Zhang, I Huang, YP Huang
Super-resolution optical classifier with high photon efficiency
We propose and demonstrate a photon-efficient optical classifier to overcome the Rayleigh limit in spatial resolution. It utilizes mode-selective sum-frequency generation and single-pixel photon detection to resolve closely spaced incoherent sources based on photon counting statistics. Super-resolving and photon efficient, this technique can find applications in microscopy, light detection and ranging, and astrophysics.
https://opg.optica.org/abstract.cfm?uri=ol-45-18-4968
H Zhang, S Kumar, YP Huang
Efficient reservoir computing using field programmable gate array and electro-optic modulation
We experimentally demonstrate a hybrid reservoir computing system consisting of an electro-optic modulator and field programmable gate array (FPGA). It implements delay lines and filters digitally for flexible dynamics and high connectivity, while supporting a large number of reservoir nodes. To evaluate the system’s performance and versatility, three benchmark tests are performed. The first is the 10th order Nonlinear Auto-Regressive Moving Average test (NARMA-10), where the predictions of 1000 and 25,000 steps yield impressively low normalized root mean square errors (NRMSE’s) of 0.142 and 0.148, respectively. Such accurate predictions over into the far future speak to its capability of large sample size processing, as enabled by the present hybrid design. The second is the Santa Fe laser data prediction, where a normalized mean square error (NMSE) of 6.73 × 10−3 is demonstrated. The third is the …
https://opg.optica.org/abstract.cfm?uri=osac-4-3-1086
P Kumar, M Jin, T Bu, S Kumar, YP Huang
Efficient optical reservoir computing for parallel data processing
We propose and experimentally demonstrate an optical reservoir computing system in free space, using second-harmonic generation for nonlinear kernel functions and a scattering medium to enhance reservoir nodes interconnection. We test it for one-step and multi-step predication of Mackey–Glass time series with different input-mapping methods on a spatial light modulator. For one-step prediction, we achieve 1.8?×?10^−3 normalized mean squared error (NMSE). For the multi-step prediction, we explore two different mapping methods: linear-combination and concatenation, achieving 16-step prediction with NMSE as low as 3.5?×?10^−4. Robust and superior for multi-step prediction, our approach and design have potential for parallel data processing tasks such as video prediction, speech translation, and so on.
https://opg.optica.org/abstract.cfm?uri=ol-47-15-3784
T Bu, H Zhang, S Kumar, M Jin, P Kumar, Y Huang
Single-Pixel Image Classification via Nonlinear Optics and Deep Neural Network
We propose and experimentally demonstrate a hybrid system which utilizes a nonlinear mode-selective optical method to extract the features with single-pixel detection and subsequently recognize the high-resolution images from a deep neural network.
https://ieeexplore.ieee.org/abstract/document/9571413/
S Kumar, T Bu, H Zhang, I Huang, 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
Counteracting quantum decoherence with optimized disorder in discrete-time quantum walks
Decoherence and disorder are two major difficulties limiting the performance of quantum systems in practical settings. Yet they can potentially counteract each other to partially restore the systems' quantum signatures. We adopt the particle swarm optimization method to find the optimal disorder for mitigating the effects of decoherence in one- and two-dimensional quantum random walks, achieving substantial increase in the mean walking distance for a wide range of decoherence strength. This result suggests a viable approach to constructing practical quantum systems robust against decoherence and disorder.
https://www.tandfonline.com/doi/abs/10.1080/09500340.2019.1655598
I Huang, YP Huang
Compressive Non-line-of-sight Imaging using a Convolutional Neural Network
We demonstrate compressive non-line-of-sight imaging with downsampling ratio of 6.25% by using a convolutional neural network (CNN). Photon arrival-time histogram with 10 picosecond resolution enables high-quality image reconstruction with CNN trained purely by using simulated dataset.
https://opg.optica.org/abstract.cfm?uri=LS-2022-JW4A.69
S Zhu, YM Sua, T Bu, YP Huang
Single-point material recognition by quantum parametric mode sorting and photon counting
We explore an active illumination approach to remote material recognition, based on quantum parametric mode sorting and single-photon detection. By measuring a photon’s time of flight at picosecond resolution, 97.8% recognition is demonstrated by illuminating only a single point on the materials. Thanks to the exceptional detection sensitivity and noise rejection, a high recognition accuracy of 96.1% is achieved even when the materials are occluded by a lossy and multiscattering obscurant.
https://opg.optica.org/abstract.cfm?uri=ao-60-14-4109
D Tafone, I Huang, P Rehain, S Zhu, YM Sua, Y Huang
Efficient reservoir computing using FPGA and electro-optic modulation
We experimentally demonstrate a reservoir computing system consisting of an electro-optic modulator and FPGA electronics. On the NARMA10 benchmark test, the normalized root mean square error can achieve as low as 0.134.
https://opg.optica.org/abstract.cfm?uri=LS-2020-JM6B.20
P Kumar, M Jin, T Bu, S Kumar, YP Huang
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 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
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
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
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
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