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Transport of ultracold atoms in superpositions of S- and D-band states in a moving optical lattice

Physical Review A 2023年第2期107卷 023303-023303页

作者： Zhongcheng Yu Jinyuan Tian Peng Peng Dekai Mao Xuzong Chen Xiaoji Zhou State Key Laboratory of Advanced Optical Communication System and Network School of Electronics Peking University Beijing 100871 China Institute of Advanced Functional Materials and Devices Shanxi University Taiyuan 030031 China

Ultracold atoms in a moving optical lattice with high controllability are a feasible platform to research the transport phenomenon. Here, we study the transport process of ultracold atoms at the D band in a one-dimensional optical lattice and manipulate the transport of superposition states with different superposition weights of S-band and D-band atoms. In the experiment, we first load ultracold atoms into an optical lattice using the shortcut method and then accelerate the optical lattice by scanning the phase of lattice beams. The atomic transport at the D band and S band is demonstrated, respectively. The group velocity of atoms at the D band is opposite to that at the S band. By preparing superposition states with different superposition weights of the D-band and S-band atoms, we realize the manipulation of atomic group velocity from positive to negative, and observe the quantum interference between atoms at different bands. The influence of the lattice depth and acceleration on the transport process is also studied. Moreover, the multiorbital simulations are coincident with the experimental results. Our paper sheds light on the transport process of ultracold atoms at higher bands in optical lattices and provides a useful method to manipulate the transport of atomic superposition states.

关键词： optical lattices & traps Transport phenomena 1-dimensional systems Bose-Einstein condensates

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Generation of polarization-multiplexed terahertz orbital angular momentum combs via all-silicon metasurfaces

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Light(advanced Manufacturing) 2024年第3期5卷 120-129页

作者： Ming-Zhe Chong Yiwen Zhou Zong-Kun Zhang Jin Zhao Yue-Yi Zhang Chong-Qi Zhang Xiaofei Zang Chao-Hai Du Pu-Kun Liu Ming-Yao Xia School of Electronics Peking UniversityBeijing 100871China Terahertz Technology Innovation Research Institute and Shanghai Key Lab of Modern Optical SystemUniversity of Shanghai for Science and TechnologyNo.516 Jun Gong RoadShanghai 200093China State Key Laboratory of Advanced Optical Communication Systems and Networks School of ElectronicsPeking UniversityBeijing 100871China

Electromagnetic waves carrying orbital angular momentum(OAM),namely OAM beams,are important in various fields including optics,communications,and quantum ***,most current schemes can only generate single or several simple OAM ***-mode OAM beams are rarely *** paper proposes a scheme to design metasurfaces that can generate multiple polarization-multiplexed OAM modes with equal intervals and intensities(i.e.,OAM combs)working in the terahertz(THz)*** a proof of concept,we first design a metasurface to generate a pair of polarization-multiplexed OAM combs with arbitrary mode ***,another metasurface is proposed to realize a pair of polarization-multiplexed OAM combs with arbitrary locations and intervals in the OAM *** results agree well with full-wave simulations,verifying a great performance of OAM combs *** method may provide a new solution to designing high-capacity THz devices used in multi-mode communication systems.

关键词： Metasurfaces Terahertz Orbital angular momentum comb Polarization multiplexing

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Optimal Controller Design for Non-Affine Nonlinear Power systems with Static Var Compensators for Hybrid UAVs

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Tsinghua Science and Technology 2022年第1期27卷 196-206页

作者： Yanchu Li Qingqing Ding Shufang Li Stanimir Valtchev Beijing Key Laboratory of Network System Architecture and Convergence Beijing Laboratory of Advanced Information Networkand School of Information&Communication EngineeringBeijing University of Posts and TelecommunicationsBeijing 100876China State Key Laboratory of Control and Simulation of Power System and Generation Equipments Tsinghua UniversityBeijing 100084China the Nova School of Science and Technology(FCT/UNL) Caparica 2829-516LisbonPortugal Technical University of Sofia(TUS) Sofia 2125Bulgaria

A generalized non-affine nonlinear power system model is presented for a single machine bus power system with a Static Var Compensator(SVC)or state Var system(SVS)for hybrid Unmanned Aerial Vehicles(UAVs).The model is constructed by differential algebraic equations on the MATLAB-Simulink platform with the programming technique of its *** the inverse system method and the Linear Quadratic Regulation(LQR),an optimized SVC controller is *** simulations under three fault conditions show that the proposed controller can effectively improve the power system transient performance.

关键词： Static Var Compensator(SVC) Unmanned Aerial Vehicles(UAV) power system non-affine nonlinear control inverse system method Linear Quadratic Regulation(LQR)

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Spectrally Efficient Faster-Than-Nyquist Dual-Band Transmission Enabled by Inter-Subcarrier Crosstalk Cancellation

Spectrally Efficient Faster-Than-Nyquist Dual-Band Transmiss...

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International Conference on optical communications and networks (ICOCN)

作者： Lina Man Yixiao Zhu Ziheng Zhang Guangying Yang Yikun Zhang Qunbi Zhuge Weisheng Hu State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China

We propose and experimentally demonstrate an inter-subcarrier crosstalk cancellation algorithm for fasterthan-Nyquist transmission. At 20% HD-FEC threshold, the achievable faster-than-Nyquist rate improves from 0.875 ... 详细信息

ISBN: (数字)9798350367652

ISBN: (纸本)9798350367669

关键词： Phase shift keying Spectral efficiency Crosstalk Dual band optical fiber communication

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Fiber-Optic Time Transfer Over a Ring network with Data Transmission

Fiber-Optic Time Transfer Over a Ring Network with Data Tran...

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Asia communications and Photonics Conference and Exhibition (ACP)

作者： Yansong Yang Kunfeng Xie Yuzhe Ma Liang Hu Jianping Chen Guiling Wu State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China

ISBN: (数字)9798350379266

ISBN: (纸本)9798350379273

In this paper, we proposed a point-to-multipoint fiber-optic time transfer scheme over ring networks. The proposed scheme is experimentally demonstrated over a 400 km ring fiber network with the communication data transmission in an adjacent channel. The results show that the clock difference with the mean value of less than 9.4 ps is obtained, and the time stability in terms of time deviation can be better than 15.17 ps@1s, while the bit error rate of the communication data transmission is better than $1.37\times 10^{-14}$ .

关键词： Time-frequency analysis Stimulated emission Bit error rate Scattering optical fiber networks Data communication optical scattering Photonics Clocks Signal to noise ratio

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Integrated terahertz vortex beam emitter for rotating target detection

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advanced Photonics 2023年第6期5卷 37-46页

作者： Jingya Xie Jun Qian Tengjiao Wang Linjie Zhou Xiaofei Zang Lin Chen Yiming Zhu Songlin Zhuang University of Shanghai for Science and Technology Terahertz Technology Innovation Research InstituteShanghai Key Laboratory of Modern Optical SystemShanghaiChina Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and NetworksDepartment of Electronic EngineeringShanghaiChina

We propose a terahertz(THz)vortex emitter that utilizes a high-resistance silicon resonator to generate vortex beams with various topological *** the challenge of double circular polarization superposition resulting from the high refractive index contrast,we regulate the transverse spin state through a newly designed second-order grating partially etched on the waveguide’s top *** reflected wave can be received directly by a linearly polarized antenna,simplifying the *** from the tuning feature,a joint detection method involving positive and negative topological charges identifies and detects rotational Doppler effects amid robust micro-Doppler interference *** emitter can be used for the rotational velocity measurement of an on-axis spinning object,achieving an impressive maximum speed error rate of∼2%.This approach holds promise for the future development of THz vortex beam applications in radar target detection and countermeasure systems,given its low cost and potential for mass production.

关键词： vortex beam emitter terahertz rotational Doppler detection

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DAC-Free 4096-QAM OFDM Transmission Employing 2-Bit Low-OSR Delta-Sigma Modulation and Dual-Drive MZM 27

DAC-Free 4096-QAM OFDM Transmission Employing 2-Bit Low-OSR ...

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27th OptoElectronics and communications Conference/International Conference on Photonics in Switching and Computing, OECC/PSC 2022

作者： Li, Jiaji Zhu, Yixiao Hu, Weisheng Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication System and Networks 800 Dongchuan Rd Shanghai200240 China

We propose and experimentally demonstrate DAC-free 4096-QAM OFDM transmission based on 2-bit delta-sigma modulator and MSB/LSB separation with DDMZM. 9 × 100MHz signals can be transmitted over 10km SSMF at 8 OSR ... 详细信息

ISBN: (数字)9784885523366

ISBN: (纸本)9784885523366

关键词： Delta sigma modulation

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Efficient SNR Scaling at >10dB per Extra Bandwidth Using Cascaded Hybrid Digital-Analog Radio-over-Fiber for Fronthaul 27

Efficient SNR Scaling at >10dB per Extra Bandwidth Using Cas...

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27th OptoElectronics and communications Conference/International Conference on Photonics in Switching and Computing, OECC/PSC 2022

作者： Zhu, Yixiao Zhuge, Qunbi Hu, Weisheng Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication System and Networks 800 Dongchuan Rd Shanghai200240 China

We present bandwidth-efficient cascaded hybrid digital-analog radio-over-fiber scheme exhibiting >10dB SNR enhancement per linearly increased bandwidth. Up to 70.8dB SNR is achieved after 20km SSMF using O-band DML... 详细信息

ISBN: (数字)9784885523366

ISBN: (纸本)9784885523366

关键词： Bandwidth

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10 λ ×3.26Tb/s CPRI-Equivalent Rate 1024-QAM DA-RoF Fronthaul in Single-Mode Fiber Using Coherent-Compliant DSP

10 λ ×3.26Tb/s CPRI-Equivalent Rate 1024-QAM DA-RoF Fronth...

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Asia communications and Photonics Conference and Exhibition (ACP)

作者： Yixiao Zhu Xiansong Fang Chenbo Zhang Lingjun Zhou Jiayu Zheng Yicheng Xu Xiaopeng Xie Fan Zhang Qunbi Zhuge Weisheng Hu State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China State Key Laboratory of Advanced Optical Communication System and Networks Peking University Beijing China

We experimentally demonstrate high-capacity coherent DA-RoF fronthaul leveraging pilot symbol- and BPS-based carrier phase recovery. Up to 4.42- This and 32.6- This CPRI-equivalent rates are achieved with single-carri...

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High-Capacity Digital-Analog Fronthaul via Self-Homo Dyne Detection

High-Capacity Digital-Analog Fronthaul via Self-Homo Dyne De...

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Asia communications and Photonics Conference and Exhibition (ACP)

作者： Yixiao Zhu Chenbo Zhang Yicheng Xu Qunbi Zhuge Xiaopeng Xie Wei sheng Hu State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China State Key Laboratory of Advanced Optical Communication System and Networks Peking University Beijing China

We overview the recent progress of high-capacity mobile fronthaul based on digital-analog radio-over-fiber and self-homodyne coherent detection. The principle, architecture, and perspectives are discussed.

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