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Non-Hermitian ultra-strong bosonic clustering through interaction-induced caging

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arXiv 2024年

作者： Yang, Mengjie Yuan, Luqi Lee, Ching Hua State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China Department of Physics National University of Singapore Singapore117551 Singapore

We uncover a new mechanism whereby the triple interplay of non-Hermitian pumping, bosonic interactions and nontrivial band topology leads to strong boson clustering. The extent of boson clustering goes beyond what is naively expected from the interaction-induced trapping of non-Hermitian pumped states and is based on an emergent caging mechanism that topological boundary modes can further enhance. Beyond our minimal model with two bosons, this caging remains applicable for generic many-boson systems subject to a broad range of density interactions and non-Hermitian hopping asymmetry. Our novel mechanism for particle clustering would inspire fundamental shifts in our comprehension of many-body non-Hermitian dynamics and open new avenues for controlling and manipulating bosons. © 2024, CC BY.

关键词： Bosons

High Resolution Displacement Measurement by a Novel Michelson Laser

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High Resolution Displacement Measurement by a Novel Michelso...

European Frequency and Time Forum (EFTF)

作者： Xiaomin Qin Zijie Liu Zhiyang Wang Hangbo Shi Tiantian Shi Jingbiao Chen State Key Laboratory of Advanced Optical Communication Systems and Networks Institute of Quantum Electronics School of Electronics Peking University Beijing China National Key Laboratory of Advanced Micro and Nano Manufacture Technology School of Inte-grated Circuits Peking University Beijing China Hefei National Laboratory Hefei China

ISBN: (数字)9798350354270

ISBN: (纸本)9798350354287

High-resolution displacement measurement is crucial in precision machining, biomedical sensing, and other fields. In this paper, we propose a novel displacement measurement scheme based on Michelson lasers, which obtains the cavity length variations from the laser frequency change, tracing displacement measurement to laser frequency measurement with high resolution. Furthermore, we present a Faraday-Michelson laser configuration utilizing the narrowband Faraday anomalous dispersion atomic filter as the frequency selection device, enabling simultaneous oscillation output of two laser beams. With frequency measurement achieving resolutions up to 12 digits, our scheme can theoretically reach a displacement measurement resolution in pm or even finer. It exceeds the current resolution of displacement measurement by laser interferometers, and can be used for precision displacement measurement and control of lithography machine and so on, paving the way for future advancements in high-resolution displacement measurement.

关键词： Laser theory Time-frequency analysis Atom lasers Measurement by laser beam Displacement measurement Biomedical measurement Time measurement Frequency measurement Sensors Laser transitions

Effective Sorting of Fractional optical Vortex Modes

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arXiv 2024年

作者： Mao, Zhengyang Liu, Haigang Chen, Xianfeng State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China Shanghai Research Center for Quantum Sciences Shanghai201315 China

Mode sorter is the crucial component of the communication systems based on orbital angular momentum (OAM). However, schemes proposed so far can only effectively sort integer OAM (IOAM) modes. Here, we demonstrate the effective sorting of fractional OAM (FOAM) modes by utilizing the coordinate transformation method, which can convert FOAM modes to IOAM modes. The transformed IOAM modes are subsequently sorted by using a mode conversion method called topological charge matching. The validation of our scheme is verified by implementing two sorting processes and corresponding mode purity analyses, both theoretically and experimentally. This new sorting method exhibits a huge potential of implementing a highly confidential and high-capacity FOAM-based communication system, which may inspire further applications in both classical and quantum regimes. Copyright © 2024, The Authors. All rights reserved.

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Accurate Closed-Form Coherent EGN Model Supporting Distributed Raman Amplification

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Accurate Closed-Form Coherent EGN Model Supporting Distribut...

OptoElectronics and communications Conference, OECC

作者： Yihao Zhang Lin Gan Qizhi Qiu Zihang Wang Qiang Guo Lilin Yi Weisheng Hu Qunbi Zhuge Department of Electronic Engineering State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China B&P Laboratory Huawei Technologies Co. Ltd. Shenzhen China

We propose a closed-form EGN model supporting distributed Raman amplification for C+L-band transmission. The model can thoroughly assess the coherence of NLI between every two spans. An estimation error of <0.2 dB ... 详细信息

ISBN: (数字)9798350308396

ISBN: (纸本)9798350308402

关键词： Estimation error Accuracy Stimulated emission Gaussian noise Coherence optical fiber communication optical noise optical fiber testing Signal to noise ratio Ultra wideband technology

Node-downloadable frequency transfer system based on a mode-locked laser with over 100 km of fiber

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arXiv 2023年

作者： Jin, Ziyi Chen, Ziyang Wu, Kai Yu, Dongrui Wu, Guohua Yu, Song Luo, Bin Guo, Hong State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Center for Quantum Information Technology Peking University Beijing100871 China

To meet the requirements of time-frequency networks and enable frequency downloadability for nodes along the link, we demonstrated the extraction of stable frequency signals at nodes using a mode-locked laser under the condition of 100 km laboratory fiber. The node consists of a simple structure that utilizes widely used optoelectronic devices and enables plug-and-play applications. In addition, the node can recover frequency signals with multiple frequencies, which are useful for scenarios that require different frequencies. Here, we experimentally demonstrated a short-term frequency instability of 2.83×10−13@1 s and a long-term frequency instability of 1.18×10−15@10,000 s at the node, which is similar to that at the remote site of the frequency transfer system. At the same time, frequency signals with different frequencies also achieved stable extraction with the same performance at the node. Our results can support the distributed application under large-scale time-frequency networks. © 2023, CC BY.

关键词： Extraction

Countermeasure for negative impact of practical source in continuous-variable measurement-device-independent quantum key distribution

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arXiv 2023年

作者： Huang, Luyu Wang, Xiangyu Sun, Yanhao Yu, Song Chen, Ziyang Guo, Hong State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Center for Quantum Information Technology Peking University Beijing100871 China

Continuous-variable measurement-device-independent quantum key distribution (CV-MDI QKD) can defend all attacks on the measurement devices fundamentally. Consequently, higher requirements are put forward for the source of CV-MDI QKD system. However, the imperfections of actual source brings practical security risks to the CV-MDI QKD system. Therefore, the characteristics of the realistic source must be controlled in real time to guarantee the practical security of the CV-MDI QKD system. Here we propose a countermeasure for negative impact introduced by the actual source in the CV-MDI QKD system based on one-time-calibration method, not only eliminating the loophole induced from the relative intensity noise (RIN) which is part of the source noise, but also modeling the source noise thus improving the performance. In particular, three cases in terms of whether the preparation noise of the practical sources are defined or not, where only one of the users or both two users operate monitoring on their respective source outputs, are investigated. The simulation results show that the estimated secret key rate without our proposed scheme is about 10.7 times higher than the realistic rate at 18 km transmission distance when the variance of RIN is only 0.4. What's worse, the difference becomes greater and greater with the increase of the variance of RIN. Thus, our proposed scheme makes sense in further completing the practical security of CV-MDI QKD system. In other words, our work enables CV-MDI QKD system not only to resist all attacks against detectors, but also to close the vulnerability caused by the actual source, thus making the scheme closer to practical security. © 2023, CC BY.

关键词： Quantum cryptography

Single-microresonator-based dynamic photonic molecule switch

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Single-microresonator-based dynamic photonic molecule switch

CLEO: Science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Tao, Zihan Shen, Bitao Li, Wencan Xing, Luwen Wang, Haoyu Wu, Yichen Tao, Yuansheng Zhou, Yan He, Yandong Peng, Chao Shu, Haowen Wang, Xingjun State Key Laboratory of Advanced Optical Communications System and Networks School of Electronics Peking University Beijing100871 China College of Engineering Peking University Beijing100871 China School of Integrated Circuits Peking University Bejing100871 China Peking University Yangtze Delta Institute of Optoelectronics Nantong226010 China Frontiers Science Center for Nano-optoelectronics Peking University Beijing100871 China Peng Cheng Laboratory Shenzhen518055 China

We propose a dynamic on-chip photonic molecule switch in an ultra-compact multimode silicon microring, allowing for flexible either nonlinear control or loss reduction. This strategy leads to a record low-loss transit... 详细信息

关键词： Molecules

Single-microresonator-based dynamic photonic molecule switch

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Single-microresonator-based dynamic photonic molecule switch

2024 Conference on Lasers and Electro-Optics, CLEO 2024

ISBN: (纸本)9781957171395

关键词： Photonic devices

Non-Gaussian reconciliation for continuous-variable quantum key distribution

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arXiv 2023年

作者： Wang, Xiangyu Xu, Menghao Zhao, Yin Chen, Ziyang Yu, Song Guo, Hong State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Center for Quantum Information Technology Peking University Beijing100871 China

Non-Gaussian modulation can improve the performance of continuous-variable quantum key distribution (CV-QKD). For Gaussian modulated coherent state CV-QKD, photon subtraction can realize non-Gaussian modulation, which can be equivalently implemented by non-Gaussian postselection. However, non-Gaussian reconciliation has not been deeply researched, which is one of the key technologies in CV-QKD. In this paper, we propose a non-Gaussian reconciliation method to obtain identical keys from non-Gaussian data. Multidimensional reconciliation and multi-edge type low density parity check codes (MET-LDPC) are used in non-Gaussian reconciliation scheme, where the layered belief propagation decoding algorithm of MET-LDPC codes is used to reduce the decoding complexity. Furthermore, we compare the error correction performance of Gaussian data and non-Gaussian data. The results show that the error correction performance of non-Gaussian data is better than Gaussian data, where the frame error rate can be reduced by 50% for code rate 0.1 at SNR of 0.1554 and the average iteration number can be reduced by 25%. © 2023, CC BY.

关键词： Iterative methods