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arXiv 2020年

作者： Li, Hang Dou, Jian-Peng Pang, Xiao-Ling Yang, Tian-Huai Zhang, Chao-Ni Chen, Yuan Li, Jia-Ming Walmsley, Ian A. Jin, Xian-Min School of Physics and Astronomy State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China CAS Center for Excellence Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui230026 China Institute for Quantum Science and Engineering Department of Physics Southern University of Science and Technology Shenzhen518055 China School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China Clarendon Laboratory University of Oxford Parks Road OxfordOX1 3PU United Kingdom Blackett Laboratory Imperial College London LondonSW7 2AZ United Kingdom

Establishing quantum entanglement between individual nodes is crucial for building large-scale quantum networks, enabling secure quantum {1., distributed quantum computing, enhanced quantum metrology and fundamental tests of quantum mechanics. However, the shared entanglements have been merely observed in either extremely low-temperature or well-isolated systems, which limits the quantum networks for the real-life applications. Here, we report the realization of heralding quantum entanglement between two atomic ensembles at room temperature, where each of them contains billions of motional atoms. By measuring the mapped-out entangled state with quantum interference, concurrence and correlation, we strongly verify the existence of a single excitation delocalized in two atomic ensembles. Remarkably, the heralded quantum entanglement of atomic ensembles can be operated with the feature of delay-choice, which illustrates the essentiality of the built-in quantum memory. The demonstrated building block paves the way for constructing quantum networks and distributing entanglement across multiple remote nodes at ambient conditions. Copyright © 2020, The Authors. All rights reserved.

关键词： Quantum entanglement

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Wavelength dimensioning for wavelength-routed WDM satellite network

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Chinese Journal of Aeronautics 2016年第3期29卷 763-771页

作者： Liu Zhe Guo Wei Deng Changlin Hu Weisheng State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University

Internet and broadband applications driven by data traffic demand have become key dri- vers for satellite constellations. The key technology to satisfy the high capacity requirements between satellites is optical satellite networks by means of wavelength division multiplexing inter- satellite links （ISLs） with wavelength routing （WDM-OSN）. Due to the limited optical amplifier bandwidth onboard the satellite, it is important to minimize the wavelength requirements to provi- sion requests. However, ISLs should be dynamically established and deleted for each satellite according to its visible satellites. Furthermore, different link assignments will result in different topologies, hence yielding different routings and wavelength assignments. Thus, a perfect match model-based link assignment scheme （LAS-PMM） is proposed to design an appropriate topology such that shorter path could be routed and less wavelengths could be assigned for each ISL along the path. Finally, simulation results show that in comparison to the regular Manhattan street net- work （MSN） topology, wavelength requirements and average end-to-end delay based on the topol- ogy generated by LAS-PMM could be reduced by 24.8% and 1..4%, respectively.

关键词： LAS LAS-PMM Routing Wavelength assignment Wavelength dimensioning WDM-OSN

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Characterizing coherence with quantum observables

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Physical Review Research 2020年第1期2卷 013157-013157页

作者： Suman Mandal Marek Narozniak Chandrashekar Radhakrishnan Zhi-Qiang Jiao Xian-Min Jin Tim Byrnes State Key Laboratory of Precision Spectroscopy School of Physical and Material Sciences East China Normal University Shanghai 200062 China Department of Arts and Sciences New York University Shanghai 1555 Century Ave Pudong Shanghai 200122 China Department of Physical Sciences Indian Institute of Science Education and Research Kolkata Mohanpur 741246 West Bengal India Department of Physics New York University New York New York 10003 USA Laboratoire ESIEA Numérique et Société ESIEA 9 Rue Vesale Paris 75005 France NYU-ECNU Institute of Physics at NYU Shanghai 3663 Zhongshan Road North Shanghai 200062 China Center for Integrated Quantum Information Technologies (IQIT) School of Physics and Astronomy and State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai 200240 China CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of China Hefei 230026 China National Institute of Informatics 2-1-2 Hitotsubashi Chiyoda-ku Tokyo 101-8430 Japan

We introduce a procedure based on quantum expectation values of measurement observables to characterize quantum coherence. Our measure allows one to quantify coherence without having to perform tomography of the quantum state and can be directly calculated from measurement expectation values. This definition of coherence allows the decomposition into contributions corresponding to the nonclassical correlations between the sub{1. and localized on each subsystem. The method can also be applied to cases where the full set of measurement operators is unavailable. An estimator using the truncated measurement operators can be used to obtain lower bound to the genuine value of coherence. We illustrate the method for several bipartite {1. and show the singular behavior of the coherence measure in a spin-1.chain, characteristic of a quantum phase transition.

关键词： Quantum coherence & coherence measures Resource theories

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Compact, submilliwatt, 2 × 2 silicon thermo-optic switch based on photonic crystal nanobeam cavities

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Photonics Research 2017年第2期5卷 108-112页

作者： HUANYING ZHOU CIYUAN QIU XINHONG JIANG QINGMING ZHU YU HE YONG ZHANG YIKAI SU RICHARD SOREF State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Engineering Department University of Massachusetts

We propose and experimentally demonstrate a 21.;2 thermo-optic(TO) crossbar switch implemented by dual photonic crystal nanobeam(PCN)cavities within a silicon-on-insulator(SOI)*** thermally tuning the refractive in... 详细信息

We propose and experimentally demonstrate a 2×2 thermo-optic(TO) crossbar switch implemented by dual photonic crystal nanobeam(PCN)cavities within a silicon-on-insulator(SOI)*** thermally tuning the refractive index of silicon,the resonance wavelength of the PCN cavities can be *** the help of the ultrasmall mode volumes of the PCN cavities,only～0.1. mW power is needed to change the switching *** a spectral passband of 0.09 nm at the 1.83.75 nm operation wavelength,the insertion loss(IL)and crosstalk(CT)performances were measured as IL(bar)=-0.2 dB,CT(bar)=-1. dB,IL(cross)=-1.5 dB,and CT(cross)=-1. ***,the thermal tuning efficiency of the fabricated device is as high as1.23 nm/mW.

关键词： PCN Compact silicon thermo-optic switch based on photonic crystal nanobeam cavities submilliwatt mode SOI

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Fabrication of depletion type micro-ring modulator with high extinction ratio and high coupling quality factor 3

Fabrication of depletion type micro-ring modulator with high...

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3rd International Conference on Mechanical, Electronic and Information Technology Engineering, ICMITE 201.

作者： Shen, Yun Wang, Xiaodong Zhang, Wei Qiu, Ciyuan Cheng, Xiulan Center for Advanced Electronic Material and Devices Shanghai Jiao Tong University Shanghai200240 China State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China

We experimentally demonstrate an optical micro-ring modulator based on a reverse-biased PN junction which is integrated into a silicon-on-insulator (SOI) rib waveguide. The performance of micro-ring resonator with different sizes is simulated with Lumerical MODE Solutions. The fabricated device provides a high extinction ratio (ER) of 20 dB and coupling quality factor (Q) 2∗1.4. Modulation rate is higher than 1. Gbit/s with only 2 V peak-to-peak (Vpp) driving voltage. The theoretical modulation rate can be higher than 25 Gbit/s by the optimizing the matching resistor and the test system. © The Authors, published by EDP Sciences, 201..

关键词： Fabrication

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An observable based approach to evaluating quantum coherence

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AIP Conference Proceedings 2020年第1期2241卷

作者： Suman Mandal Marek Narozniak Chandrashekar Radhakrishnan Manikandan Kondappan Zhiqiang Jiao Xiamin Jin Tim Byrnes 1)Division of Arts and Sciences NYU Shanghai 1555 Century Ave Shanghai-200122 China 2)Department of Physics New York University New York NY-10003 USA 3)State Key Laboratory of Precision Spectroscopy East China Normal University Minhang Shanghai-200241 China 4)State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai-200240 China 5)National Institute of Informatics Chiyoda City Tokyo-101-8430 Japan

We introduce a procedure based on quantum expectation values of measurement observables to characterize quantum coherence. In a bipartite system, the two-point correlation function is used in combination with the Schatten-1.norm to estimate the quantum coherence. This definition of coherence allows the decomposition into contributions corresponding to the non-classical correlations between the subsystems and localized on each subsystem. We illustrate the method for several bipartite systems, showing that an incomplete basis still gives a qualitative measure of the coherence.

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Fluorescent intensity of single bio-molecule enhancement by optofluidic resonator

Fluorescent intensity of single bio-molecule enhancement by ...

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Bio-Optics: Design and Application, BODA 201.

作者： Ye, Xiaona Dai, Hailang Cao, Zhuangqi Chen, Xianfeng The State Key Lab. on Fiber Optic Local Communicaton Networks Advanced Optical Communication Systems Department of Physics and Astronomy Shanghai JiaoTong University Shanghai200240 China Shanghai Jiao Tong University Shanghai200240 China

Single molecular fluorescence enhancement is investigated via a novel method called optofluidic resonator hollow-core metal-cladding waveguide (ORHCMW). The fluorescence intensity of low-concentration solution has bee... 详细信息

ISBN: (纸本)9781943580255

关键词： Resonators

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Fabrication and application of a graphene polarizer with strong saturable absorption

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Photonics Research 2016年第2期4卷 41-44页

作者： Weixiong Li Lilin Yi Ran Zheng Zhenghua Ni Weisheng Hu The State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Department of Physics Southeast University

By transferring 1.0 nm gold-coated CVD monolayer graphene onto the well-polished surface of D-shaped fiber, we achieve a graphene in-line polarizer with a high polarization extinction ratio of ~27 d B and low insertion loss of 5 d B at 1.50 nm, meanwhile achieving a strong saturable absorption effect of 1.%. The manufacture of this graphene in-line polarizer also simplifies the graphene transfer process. To explore the potential applications of the new device, we also demonstrate noise-like pulse generation and supercontinuum spectrum generation. By launching the designed graphene device into a fiber ring laser cavity, 51.nm bandwidth noise-like pulse is obtained. Then, launching the high-power noise-like pulse into high nonlinear fiber, a 1.00 nm wide supercontinuum spectrum is obtained, which is favorable for sensing and nonlinearities scientific fields.

关键词： Fabrication and application of a graphene polarizer with strong saturable absorption mode PDL

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Diffraction efficiency enhancement of transient holographic gratings in nematic liquid crystals doped with Disperse Red 1

Diffraction efficiency enhancement of transient holographic ...

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201. 2nd International Conference on Automation,Mechanical Control and Computational Engineering(AMCCE 201.)

作者： Hongjing LI Changshun WANG State Key Lab of Advanced Optical Communication Systems and Networks Department of Physics and AstronomyShanghai Jiao Tong University

The diffraction properties of transient holographic gratings recorded by two 532 nm laser beams were investigated in nematic liquid crystals doped with Disperse Red 1.A nearly 30-fold enhancement of the first-order diffraction efficiency as a function of heating time was obtained when the sample temperature was close to the clearing point in the nematic phase.A peak shift of diffraction efficiency with the increase of recording light intensity was observed,which was attributed to laser induced photochemical nematic-isotropic phase transition.

关键词： Azo dye Liquid crystals Holographic grating

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Synchronous driving scheme for silicon-based optical switches to critically compensate for thermo-optic effect in carrier injection

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Applied optics 2017年第2期56卷 205-210页

作者： Mingle Liao Baojian Wu Wei Huang Heng Zhou Linjie Zhou Kun Qiu Jianping Chen Key Lab of Optical Fiber Sensing and Communication Networks Ministry of Education University of Electronic Science and Technology of China 611731 Chengdu China State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China

The switching performance of high-speed optical-switching-integrated chips is to a great extent dependent on the carrier injection technique, which is accompanied by the thermo-optic effect. In this paper, we put forward a synchronous driving scheme for the silicon-based Mach-Zehnder interferometer (MZI) optical switches, which is capable of critically compensating for the temperature variation with carrier injection to the p-i-n diode on one arm of the MZI by applying a synchronous modulating voltage to the silicon resistive heater on the other MZI arm. The synchronous compensation mechanism is identified by experiments and simulation. Our experimental data show that, by comparison with the traditional driving scheme, the synchronous driving scheme can improve the extinction ratio by 1.dB, along with a better switching waveform.

关键词： All optical {1. Effective refractive index Extinction ratios Field programmable gate arrays optical interconnects Packet switched networks

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