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Applied Mathematics and Mechanics(English Edition) 2004年第7期25卷 730-740页

作者：周振功王彪 center for Composite Materials and Electro-optics Technology center

The behaviors of an interface crack between dissimilar orthotropic elastic half-planes subjected to uniform tension was reworked by use of the Schmidt *** use of the Fourier transform,the problem can be solved with the help of two pairs of dual integral equations,of which the unknown variables are the jumps of the displacements across the crack *** examples are provided for the stress intensity factors of the *** to the previous solution of the interface crack,it is found that the stress singularity of the present interface crack solution is of the same nature as that for the ordinary crack in homogeneous *** the materials from the two half planes are the same,an exact solution can be otained.

关键词： interfacial crack Schmidt method dual integral equation orthotropic material

Mach–Zehnder interferometer with squeezed and EPR entangled optical fields

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Chinese Physics B 2016年第2期25卷 70-75页

作者：于旭东李卫朱诗尧张靖 The State Key Laboratory of Quantum optics and Quantum optics Devices Institute of Opto-Electronics Shanxi University Collaborative Innovation center of Extreme optics Shanxi University Beijing Computational Science Research center

We study a scheme for Mach-Zehnder （MZ） interferometer as a quantum linear device by injecting two-mode squeezed input states into two ports of interferometer. Two-mode squeezed states can be changed into two types of in- puts for MZ interferometer： two squeezed states and Einstein-Podolsky-Rosen （EPR） entangled states. The interference patterns of the MZ interferometer vary periodically as the relative phase of the two arms of the interferometer is scanned, and are measured by the balanced homodyne detection system. Our experiments show that there are different interference patterns and periodicity of the output quantum states for two cases which depend on the relative phase of input optical fields. Since MZ interferometer can be used to realize some quantum operations, this work will have the important applications in quantum information and metrology.

关键词： quantum information interferometers

Quantum network based on non-classical light

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Science China(Information Sciences) 2020年第8期63卷 110-121页

作者： Xiaolong SU Meihong WANG Zhihui YAN Xiaojun JIA Changde XIE Kunchi PENG State Key Laboratory of Quantum optics and Quantum optics Devices Institute of Opto-ElectronicsShanxi University Collaborative Innovation center of Extreme optics Shanxi University

Quantum network enables quantum communication among quantum nodes and provides advantages that are unavailable in any classical network. Based on rapidly developing science and technology in quantum communication, the studies on quantum network have also made important progresses recent *** this study, we briefly review the experimental progresses in building quantum network based on optical field and discuss the challenges toward a quantum Internet.

关键词： quantum network non-classical light quantum entanglement quantum communication quantum teleportation

Continuous variable quantum teleportation and remote state preparation between two space-separated local networks

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Science China(Information Sciences) 2024年第4期67卷 314-322页

作者： Siyu REN Dongmei HAN Meihong WANG Xiaolong SU State Key Laboratory of Quantum optics and Quantum optics Devices Institute of Opto-ElectronicsShanxi University Collaborative Innovation center of Extreme optics Shanxi University

Implementing quantum communication between space-separated local networks is essential for designing global quantum networks. In this study, we propose quantum teleportation and remote state preparation schemes between users of two space-separated local networks established by continuous-variable multipartite entangled states. In the proposed schemes, the quantum nodes belonging to the two distant local networks are first entangled by entanglement swapping, and then quantum communication protocols are realized. We show that quantum teleportation between any two users belonging to space-separated local networks can be realized with the assistance of other users, and squeezed thermal states can be remotely prepared in one local network by performing a homodyne projective measurement on the state in another distant local network. Our results provide a feasible approach for quantum communication between spaceseparated quantum networks with multipartite entangled states.

关键词： quantum communication quantum network quantum teleportation remote state preparation entanglement swapping continuous variable

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Ultra-broadband modulation instability gain characteristics in As_2S_3 and As_2Se_3 chalcogenide glass photonic crystal fiber

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Chinese Physics B 2016年第6期25卷 259-263页

作者：王河林吴彬王肖隆 center for optics and Optoelectronics Research Zhejiang University of Technology

Based on the designed As2Se3 and As2S3 chalcogenide glass photonic crystal fiber（PCF） and the scalar nonlinear Schrdinger equation,the effects of pump power and wavelength on modulation instability（MI） gain are comprehensively studied in the abnormal dispersion regime of chalcogenide glass *** to high Raman effect and high nonlinearity,ultra-broadband MI gain is obtained in chalcogenide glass *** choosing the appropriate pump parameter,the MI gain bandwidth reaches 2738 nm for the As2Se3 glass PCF in the abnormal-dispersion region,while it is 1961 nm for the As2S3 glass PCF.

关键词： ultra-broadband modulation instability Raman effect high nonlinearity chalcogenide glass photonic crystal fiber

The role of surface charges in the blinking mechanisms and quantum-confined Stark effect of single colloidal quantum dots

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Nano Research 2022年第8期15卷 7655-7661页

作者： Jialu Li Dengfeng Wang Guofeng Zhang Changgang Yang Wenli Guo Xue Han Xiuqing Bai Ruiyun Chen Chengbing Qin Jianyong Hu Liantuan Xiao Suotang Jia State Key Laboratory of Quantum optics and Quantum optics Devices Institute of Laser SpectroscopyCollaborative Innovation Center of Extreme OpticsShanxi UniversityTaiyuan 030006China

The two frequently observed phenomena,photoluminescence(PL)blinking and quantum-confined Stark effect(QCSE)-induced spectral diffusion,are not conducive to the applications of colloidal quantum dots(QDs).It remains elusive how these two phenomena are linked to each *** the potential link between blinking and QCSE could facilitate the adoption of appropriate strategies that can simultaneously suppress both PL blinking and spectral *** this work,we investigated the blinking mechanism and QCSE of single CdSe/CdS/ZnS QDs in the presence of positive and negative surface charges using single-dot PL *** found that the negative surface charges can simultaneously suppress PL blinking and spectral diffusion of single *** the other hand,the positive surface charges could change the blinking mechanisms of QDs from Auger-blinking to band-edge carrier(BC)-*** types of QCSE were observed,and a significant QCSE-induced spectral broadening of 5.25 nm was measured,which could be attributed to the hopping of surface charges between different surface-trap *** on these findings,several theoretical models are proposed to explain various phenomena observed.

关键词： single quantum dots blinking mechanisms quantum-confined Stark effect surface charges surface traps

Quantum degenerate Bose–Fermi atomic gas mixture of 23Na and 40K

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Chinese Physics B 2023年第2期32卷 242-249页

作者：李子亮顾正宇师振莲王鹏军张靖 State Key Laboratory of Quantum optics and Quantum optics Devices Institute of Opto-electronicsCollaborative Innovation Center of Extreme OpticsShanxi UniversityTaiyuan 030006China

We report a compact experimental setup for producing a quantum degenerate mixture of Bose23Na and Fermi40K gases. The atoms are collected in dual dark magneto–optical traps(MOT) with species timesharing loading to reduce the light-induced loss, and then further cooled using the gray molasses technique on the D2line for23Na and D1line for40K. The microwave evaporation cooling is used to cool23Na in |F = 2, mF= 2〉 in an optically plugged magnetic trap, meanwhile,40K in |F = 9/2, mF= 9/2〉 is sympathetically cooled. Then the mixture is loaded into a large volume optical dipole trap where23Na atoms are immediately transferred to |1, 1〉 for further effective cooling to avoid the strong three-body loss between23Na atoms in |2, 2〉 and40K atoms in |9/2, 9/2〉. At the end of the evaporation in optical trap, a degenerate Fermi gas of40K with 1.9 × 10^(5) atoms at T/TF= 0.5 in the |9/2, 9/2〉 hyperfine state coexists with a Bose–Einstein condensate(BEC) of23Na with 8 × 10^(4) atoms in the |1, 1〉 hyperfine state at 300 n K. We also can produce the two species mixture with the tunable population imbalance by adjusting the 23Na magneto–optical trap loading time.

关键词： ultracold gases degenerate Bose–Fermi mixture

Investigation of the thermal adaptability for a mobile cold atom gravimeter

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Chinese Physics B 2016年第12期25卷 241-246页

作者：王启宇王兆英付志杰林强 Institute of optics Department of PhysicsZhejiang University center for optics and Optoelectronics Research College of ScienceZhejiang University of Technology

The cold atom gravimeter offers the prospect of a new generation of inertial sensors for field applications. We ac- complish a mobile atom gravimeter. With the compact and stable system, a sensitivity of 1.4× 10-7 ***-1/2 is achieved. Moreover, a continuous gravity monitoring of 80 h is carried out. However, the harsh outdoor environment is a big challenge for the atom gravimeter when it is for field applications. In this paper, we present the preliminary investigation of the thermal adaptability for our mobile cold atom gravimeter. Here, we focus on the influence of the air temperature on the performance of the atom gravimeter. The responses to different factors （such as laser power, fiber coupling efficiency, etc.） are evaluated when there is a great temperature shift of 10 ℃. The result is that the performances of all the factors deteriorate to different extent, nevertheless, they can easily recover as the temperature comes back. Finally, we conclude that the variation of air temperature induces the increase of noise and the system error of the atom gravimeter as well, while the process is reversible with the recovery of the temperature.

关键词： atom gravimeter the environmental adaptability atom intefferometer

Hybrid quantum key distribution network

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Science China(Information Sciences) 2022年第10期65卷 24-30页

作者： Siyu REN Yu WANG Xiaolong SU State Key Laboratory of Quantum optics and Quantum optics Devices Institute of Opto-Electronics Collaborative Innovation center of Extreme optics Shanxi University State Key Laboratory of Cryptology

Quantum key distribution(QKD) is now moving toward a scalable and secure QKD network,which establishes secret keys among network users. The continuous-variable(CV) and discrete-variable(DV)QKD systems are currently being developed in parallel and are all used in QKD networks. We propose here a hybrid QKD network, in which the CV QKD system is used to build metropolitan QKD networks, and the DV QKD system is used to connect metropolitan QKD networks. The hybrid QKD network takes advantage of high secret key rates for CV QKD systems and long distance for DV QKD systems. We also present a feasible hybrid measurement-device-independent(MDI) QKD network, which combines both CV and DV MDI QKD systems. The presented hybrid QKD networks meet the low cost and compact requirement of a realistic QKD network and provide a feasible solution for future real QKD networks by combining the advantages of both CV and DV QKD systems.

关键词： quantum network quantum key distribution hybrid quantum information continuous variable discrete variable

Experimental Observation of Spin-Exchange in Ultracold Fermi Gases

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Chinese Physics Letters 2018年第3期35卷 18-21页

作者：彭鹏黄良辉李东豪孟增明王鹏军张靖 State Key Laboratory of Quantum optics and Quantum optics Devices Institute of Opto-electronicsShanxi University Collaborative Innovation center of Extreme optics Shanxi University

We experimentally study the spin exchange collision in ultracold 40K Fermi gases. The quadratic Zeeman shift, trap potential and temperature of atomic cloud will influence on the spin changing dynamics. Dependences of the spin components populations on the external bias magnetic field, the optical trap depth and the temperature of atomic cloud are experimentally investigated. The spin exchange from the initial states to the final state are observed for different initial states. This work shows an interesting process of reaching equilibrium by redistribution among the spin states with the spin exchange collision in an ultracold large-spin Fermi gas.

关键词： Experimental Observation of Spin-Exchange in Ultracold Fermi Gases