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Quantum storage of optical signals and coherent manipulation of quantum states based on electromagnetically induced transparency

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Chinese Science Bulletin 2012年第16期57卷 1893-1902页

作者： WANG Hai XIE ChangDe peng kunchi State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China

Electromagnetically induced transparency (EIT) techniques are important tools for the storage of the quantum states of light fields in atomic ensembles and for enhancement of the interaction between photons. In this paper, we briefly summarize the recent experimental studies conducted by our group on enhanced cross-phase modulation based on double EIT effects, the quantum interference of stored dual-channel spin-wave excitations and the coherent manipulation of the spin wave vector for the polarization of photons in a single tripod atomic system. The work presented here has potential application in the developing field of quantum information processing.

关键词：信号存储量子态电磁诱导透明操纵相干电磁感应透明交叉相位调制量子信息处理

Preparation of multipartite entangled states used for quantum information networks

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Science China(Physics,Mechanics & Astronomy) 2014年第7期57卷 1210-1217页

作者： SU XiaoLong JIA XiaoJun XIE ChangDe peng kunchi State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-Electronics Shanxi University

The preparation of multipartite entangled states is the prerequisite for exploring quantum information networks and quantum *** this paper,we review the experimental progress in the preparation of cluster states and multi-color entangled states with continuous *** preparation of lager scale multipartite entangled state provide valuable quantum resources to implement more complex quantum informational tasks.

关键词： quantum information with optical qumodes quantum computation entangled state continuous quantum variable

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

Quantum computation and error correction based on continuous variable cluster states

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Chinese Physics B 2021年第6期30卷 18-27页

作者： Shuhong Hao Xiaowei Deng Yang Liu Xiaolong Su Changde Xie kunchi peng State Key Laboratory of Quantum Optics and Quantum Optics Devices Collaborative Innovation Center of Extreme OpticsInstitute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China School of Mathematics and Physics Anhui University of TechnologyMaanshan 243000China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China

Measurement-based quantum computation with continuous variables,which realizes computation by performing measurement and feedforward of measurement results on a large scale Gaussian cluster state,provides a feasible way to implement quantum *** error correction is an essential procedure to protect quantum information in quantum computation and quantum *** this review,we briefly introduce the progress of measurement-based quantum computation and quantum error correction with continuous variables based on Gaussian cluster *** also discuss the challenges in the fault-tolerant measurement-based quantum computation with continuous variables.

关键词： quantum computation quantum error correction continuous variables cluster state

CW Self-Frequency-Doubling Laser Operating on Nd:MgO:LiNbO_(3) High-Gain Polarization

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Chinese Physics Letters 1993年第4期10卷 231-234页

作者： LI Ruining WANG Junmin LIANG Xiaoyan XIE Changde peng kunchi XU Guanfeng Institute of Optoelec tronic Researches Shanxi UniversityTaiyuan 030006 Southwestern Institute of Technical Physics Chengdu 610041

The CW second-harmonic wave of high-gain polarization atλ=l.085μm was demonstrated with Nd:MgO:LiNbO_(3) self-frequency-doubling laser cavity inserted with a quarter wave-plate of the fundamental *** pump power threshold for the second-harmonic generation as low as 9.9mW was *** maximum second-harmonic output was 11.4 m W,the conversion efficiency for the total second-harmonic output was 11.3%per Watt.

关键词： Nd: polarization pump

A　High　Efficient　Stable　Intracavity　Doubling　Nd：YAG　Laser　Pumped　by　a　Laser　Diode

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Chinese Journal of Lasers 1995年第4期B4卷 295-300页

作者： ZHANG Kuanshou XIE Changde GUO Ringxiang peng kunchi(Institute of Opto- electronics ,Shanxi University,Taiyuan 030006) Shanxi Univ Taiyuan China

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ＡＨｉｇｈＥｆｆｉｃｉｅｎｔＳｔａｂｌｅＩｎｔｒａｃａｖｉｔｙＤｏｕｂｌｉｎｇＮｄ：ＹＡＧＬａｓｅｒＰｕｍｐｅｄｂｙａＬａｓｅｒＤｉｏｄｅ￥ＺＨＡＮＧＫｕａｎｓｈｏｕ；ＸＩＥＣｈａｎｇｄｅ；ＧＵＯＲｉｎｇｘｉａｎｇ；ＰＥＮＧＫｕｎｃｈｉ（Ｉｎｓｔｉｔ...

关键词： intracavity harmonic Nd:YAG laser LD pumped laser

Quantifying quantum coherence of optical cat states

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Photonics Research 2021年第5期9卷 887-892页

作者： MIAO ZHANG HAIJUN KANG MEIHONG WANG FENGYI XU XIAOLONG SU kunchi peng State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

The optical cat state plays an essential role in quantum computation and quantum metrology. Here, we experimentally quantify quantum coherence of an optical cat state by means of relative entropy and the l1 norm of coherence in a Fock basis based on the prepared optical cat state at the rubidium D1 line. By transmitting the optical cat state through a lossy channel, we also demonstrate the robustness of quantum coherence of the optical cat state in the presence of loss, which is different from the decoherence properties of fidelity and Wigner function negativity of the optical cat state. Our results confirm that quantum coherence of optical cat states is robust against loss and pave the way for the application of optical cat states.

关键词： state. quantum states

Mutually testing source-device-independent quantum random number generator

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Photonics Research 2022年第3期10卷 646-652页

作者： Jialin Cheng Jiliang Qin Shaocong Liang Jiatong Li Zhihui Yan Xiaojun Jia kunchi peng State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Quantum random numbers have an incomparable advantage over pseudo-random numbers since randomness originates from intrinsic property of quantum *** generation rate and the security of quantum random numbers are two significant indicators of a quantum random number generator(QRNG)for practical *** we propose a mutually testing source-device-independent QRNG by simultaneously measuring a pair of conjugate quadratures from two separate parts of an untrusted continuous-variable quantum *** amounts of randomness of the quadratures can be mutually estimated by each other via entropic uncertainty *** of randomly toggling between the conjugate quadratures of one state for collecting different types of data,two quadratures can generate check data and raw bits simultaneously and continuously in this mutually testing manner,which enhances the equivalent generation rate of private random bits to around 6 Gbit/s with a 7.5 mW laser ***,the overall security is also improved by adjusting the conditional min-entropy in real time according to the continually monitored fluctuations of the local oscillator and the randomly measured electronic noise of homodyne detectors.

关键词： quantum random testing

Experimental test of error-disturbance uncertainty relation with continuous variables

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Photonics Research 2019年第11期7卷 I0012-I0016页

作者： Yang Liu Haijun Kang Dongmei Han Xiaolong Su kunchi peng State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

The uncertainty relation is one of the fundamental principles in quantum mechanics and plays an important role in quantum information science. We experimentally test the error-disturbance uncertainty relation(EDR) with continuous variables for Gaussian states. Two incompatible continuous-variable observables, amplitude and phase quadratures of an optical mode, are measured simultaneously using a heterodyne measurement *** EDR values with continuous variables for coherent, squeezed, and thermal states are verified *** experimental results demonstrate that Heisenberg’s EDR with continuous variables is violated, while Ozawa’s and Branciard’s EDRs with continuous variables are validated.

关键词： continuous relation variables