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A single photonic cavity with two independent physical synthetic dimensions

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arXiv 2019年

作者： Dutt, Avik Lin, Qian Yuan, Luqi Minkov, Momchil Xiao, Meng Fan, Shanhui Ginzton Laboratory Department of Electrical Engineering Stanford University Stanford CA94305 United States Department of Applied Physics Stanford University Stanford CA94305 United States State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China Key Laboratory of Artificial Micro- and Nano-structures Ministry of Education School of Physics and Technology Wuhan University Wuhan430072 China

The concept of synthetic dimensions, which has enabled the study of higher-dimensional physics on lower-dimensional physical structures, has generated significant recent interest in many branches of science ranging from ultracold-atomic physics to photonics, since such a concept provides a versatile platform for realizing effective gauge potentials and novel topological physics. Previous experiments demonstrating this concept have augmented the real-space dimensionality by one additional physical synthetic dimension. Here we endow a single ring resonator with two independent physical synthetic dimensions. Our system consists of a temporally modulated ring resonator with spatial coupling between the clockwise and counterclockwise modes, creating a synthetic Hall ladder along the frequency and pseudospin degrees of freedom for photons propagating in the ring. We experimentally observe a wide variety of rich physics, including effective spin-orbit coupling, magnetic fields, spin-momentum locking, a Meissner-to-vortex phase transition, and chiral currents, completely in synthetic dimensions. Our experiments demonstrate that higher-dimensional physics can be studied in simple systems by leveraging the concept of multiple simultaneous synthetic dimensions. Copyright © 2019, The Authors. All rights reserved.

关键词： Degrees of freedom (mechanics)

Programmable and fast-switchable passively harmonic mode-locking fiber laser

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Programmable and fast-switchable passively harmonic mode-loc...

optical Fiber communication Conference, OFC 2018

作者： Pu, Guoqing Yi, Lilin Zhang, Li Hu, Weisheng State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Department of Electronic Engineering Shanghai200240 China

Programmable harmonic mode-locking are achieved in graphene-based mode-locking fiber laser enabled by mode-locking discrimination algorithm and fast polarization tuning. Fundamental, second-order and third-order harmo... 详细信息

ISBN: (纸本)9781943580385

关键词： Fiber lasers

Beyond Fourier transform: Break the axial resolution limit in optical coherence tomography

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arXiv 2020年

作者： Ling, Yuye Wang, Mengyuan Gan, Yu Yao, Xinwen Schmetterer, Leopold Zhou, Chuanqing Su, Yikai John Hopcroft Center for Computer Science Shanghai Jiao Tong University Shanghai China Department of Electrical and Computer Engineering University of Alabama AL United States Singapore Institute for Health Technologies Nanyang Technological University Singapore Singapore Eye Research Institute Singapore National Eye Centre Singapore School of Chemical and Biomedical Engineering Nanyang Technological University Singapore Institute of Biomedical Engineering Shenzhen Bay Lab Shenzhen China School of Biomedical Engineering Shanghai Jiao Tong University Shanghai China State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai China

optical coherence tomography (OCT) is a volumetric imaging modality that empowers clinicians and scientists to noninvasively visualize and examine the microscopic cross-sectional architectures of biological samples. By taking advantage of the coherence gating, OCT could achieve micrometer-level axial sectioning with high sensitivity. In the past decade, substantial efforts have been made to push the axial resolution of Fourier-domain OCT (FD-OCT) further into the sub-micron regime by physically extending the system's spectral bandwidth. Here, we offer a new perspective on this problem with the help of a new theoretical framework. We identified a key limitation on the reconstruction's axial resolution, which is induced by the Fourier transform-based reconstruction algorithm. To break this limit, we presented a novel optimization-based algorithm to recover the super-resolution image from ordinary FD-OCT measurements with proper physical assumptions. To prove the concept, we retrieved images at a resolution higher than the theoretical prediction in both phantoms and biological samples. Copyright © 2020, The Authors. All rights reserved.

关键词： optical tomography

Silicon-graphene hybrid slot waveguide with enhanced four-wave mixing efficiency

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Silicon-graphene hybrid slot waveguide with enhanced four-wa...

optical Fiber communication Conference, OFC 2018

作者： Yang, Yuxing Jiang, Xinhong Xu, Zhenzhen Zhang, Yong Qiu, Ciyuan Guo, Xuhan Su, Yikai State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China

An enhanced four-wave mixing in a silicon-graphene hybrid slot waveguide is proposed and experimentally demonstrated. The conversion efficiency is -48.8 dB, showing 3.2-dB and 0.5-dB improvements relative to silicon s... 详细信息

ISBN: (纸本)9781943580385

关键词： Four wave mixing

Photon retention in coherently excited nitrogen ions

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arXiv 2020年

作者： Yao, Jinping Wang, Luojia Chen, Jinming Wan, Yuexin Zhang, Zhihao Zhang, Fangbo Qiao, Lingling Yu, Shupeng Fu, Botao Zhao, Zengxiu Wu, Chengyin Yakovlev, Vladislav V. Yuan, Luqi Chen, Xianfeng Cheng, Ya Shanghai201800 China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China University of Chinese Academy of Sciences Beijing100049 China School of Physical Science and Technology ShanghaiTech University Shanghai200031 China Department of Physics National University of Defense Technology Changsha410073 China State Key Laboratory for Mesoscopic Physics School of Physics Peking University Beijing100871 China Texas A&M University College StationTX77843 United States Shanghai Research Center for Quantum Sciences Shanghai201315 China Jinan Institute of Quantum Technology Jinan250101 China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal University Jinan250358 China Collaborative Innovation Center of Extreme Optics Shanxi University Shanxi Taiyuan030006 China

Quantum coherence in quantum optics is an essential part of optical information processing and light manipulation. Alkali metal vapors, despite the numerous shortcomings, are traditionally used in quantum optics as a working medium due to convenient near-infrared excitation, strong dipole transitions and long-lived coherence. Here, we proposed and experimentally demonstrated photon retention and subsequent re-emittance with the quantum coherence in a system of coherently excited molecular nitrogen ions (N+2) which are produced using a strong 800 nm femtosecond laser pulse. Such photon retention, facilitated by quantum coherence, keeps releasing directly-unmeasurable coherent photons for tens of picoseconds, but is able to be read-out by a time-delayed femtosecond pulse centered at 1580 nm via two-photon resonant absorption, resulting in a strong radiation at 329.3 nm. We reveal a pivotal role of the excited-state population to transmit such extremely weak re-emitted photons in this system. This new finding unveils the nature of the coherent quantum control in N+2 for the potential platform for optical information storage in the remote atmosphere, and facilitates further exploration of fundamental interactions in the quantum optical platform with strong-field ionized molecules. Copyright © 2020, The Authors. All rights reserved.

关键词： Photons

High contrast linking 6 lasers to a 1 GHz Ybfiber laser frequency comb

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arXiv 2018年

作者： Ma, Yuxuan Meng, Fei Wang, Yan Wang, Aimin Zhang, Zhigang State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science Peking University Beijing100871 China National Institute of Metrology Beijing100029 China

We demonstrate a 0.95 GHz repetition rate fully stabilized Yb:fiber frequency comb without optical amplification. Benefitted from the high mode power and high coherence, this comb achieved 35 dB to 42 dB signal to noise ratio on the direct heterodyne beat signals with at least 6 continuous wave lasers (at 580nm, 679nm, 698nm, 707nm, 813nm and 922 nm) while keeping >40 dB carrier envelop frequency signal. It can be used for the direct measurement of optical frequencies in visible and near-infrared wavelengths, and has a great potential on simultaneous comparison of multiple optical frequencies. Copyright © 2018, The Authors. All rights reserved.

关键词： optical materials

Additional Rayleigh-scattering phase in distributed acoustic sensing system

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Additional Rayleigh-scattering phase in distributed acoustic...

optical Fiber Sensors, OFS 2018

作者： He, Xiangge Gu, Lijuan Liu, Fei Yi, Duo Zhang, Min Chen, Zhangyuan School of Electronics Engineering and Computer Science Peking University Beijing100871 China School of Physics Peking University Beijing100871 China Institute of Ocean Research Peking University Beijing100871 China State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing100871 China

The theoretical model for distributed acoustic sensing system is developed which agrees well with the experiment, and the phase fading phenomenon caused by additional Rayleigh-scattering phase is studied for the first... 详细信息

ISBN: (纸本)9781943580507

关键词： Rayleigh scattering

Coupling of Edge states and Topological Bragg Solitons

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Physical Review Letters 2019年第25期123卷 254103-254103页

作者： Weifeng Zhang Xianfeng Chen Yaroslav V. Kartashov Vladimir V. Konotop Fangwei Ye State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China Institute of Spectroscopy Russian Academy of Sciences Troitsk Moscow Region 108840 Russia Departamento de Física and Centro de Física Teórica e Computacional Faculdade de Ciências Universidade de Lisboa Campo Grande Edifício C8 Lisboa 1749-016 Portugal

The existence of the edge states at the interface between two media with different topological properties is protected by symmetry, which makes such states robust against structural defects or disorder. We show that, if a system supports more than one topological edge state at the interface, even a weak periodic deformation may scatter one edge state into another without coupling to bulk modes. This is the Bragg scattering of the edge modes, which in a topological system is highly selective, with closed bulk and backward scattering channels, even when conditions for resonant scattering are not satisfied. When such a system bears nonlinearity, Bragg scattering enables the formation of a new type of soliton—topological Bragg solitons. We report them in a spin-orbit-coupled (SOC) Bose-Einstein condensate in a homogeneous honeycomb Zeeman lattice. An interface supporting two edge states is created by two different SOCs, with the y component of the synthetic magnetic field having opposite directions at different sides of the interface. The reported Bragg solitons are found to be stable.

关键词： Cold atoms & matter waves Solitons Spin-orbit coupling Topological insulators Nonlinear waves Spinor Bose-Einstein condensates

The parallel Grover as dynamic system

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arXiv 2018年

作者： Goscinski, Alexander State Key Laboratory of Advanced Optical Communication Systems and Networks Key Lab on Navigation and Location-based Service Department of Electronic Engineering Shanghai Jiaotong University Dongchuan Road 800 Shanghai200240 China

A sequential application of the Grover algorithm to solve the iterated search problem has been improved by Ozhigov [1] by parallelizing the application of the oracle. In this work a representation of the parallel Grover as dynamic system of inversion about the mean and Grover operators is given. Within this representation the parallel Grover for k = 2 can be interpreted as rotation in three-dimensional space and it can be shown that the sole application of the parallel Grover operator does not lead to a solution for k > 2. We propose a solution for k = 3 with a number of approximately 1.51√N iterations. Copyright © 2018, The Authors. All rights reserved.

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