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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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Improvement and security analysis of multi-ring discrete modulation continuous variable quantum secret sharing scheme

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Chinese Physics B 2024年第7期33卷 189-197页

作者：姜欢窈聂敏杨光孙爱晶张美玲裴昌幸 School of Communications and Information Engineering&School of Artificial Intelligence Xi'an University of Posts and TelecommunicationsXi'an 710121China State Key Laboratory of Integrated Service Networks Xidian UniversityXi'an 710071China

In order to avoid the complexity of Gaussian modulation and the problem that the traditional point-to-point communication DM-CVQKD protocol cannot meet the demand for multi-user key sharing at the same time, we propose a multi-ring discrete modulation continuous variable quantum key sharing scheme(MR-DM-CVQSS). In this paper, we primarily compare single-ring and multi-ring M-symbol amplitude and phase-shift keying modulations. We analyze their asymptotic key rates against collective attacks and consider the security key rates under finite-size effects. Leveraging the characteristics of discrete modulation, we improve the quantum secret sharing scheme. Non-dealer participants only require simple phase shifters to complete quantum secret sharing. We also provide the general design of the MR-DM-CVQSS *** conduct a comprehensive analysis of the improved protocol's performance, confirming that the enhancement through multi-ring M-PSK allows for longer-distance quantum key distribution. Additionally, it reduces the deployment complexity of the system, thereby increasing the practical value.

关键词： discrete modulation continuous variable quantum secret sharing scheme

Effect of excess noise on continuous variable entanglement sudden death and Gaussian quantum discord

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Chinese Physics B 2013年第8期22卷 269-273页

作者：苏晓龙 State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-Electronics Shanxi University

A symmetric two-mode Gaussian entangled state is used to investigate the effect of excess noise on entanglement sudden death and Gaussian quantum discord with continuous variables. The results show that the excess noise in the channel can lead to entanglement sudden death of a symmetric two-mode Gaussian entangled state, while Gaussian quantum discord never vanishes. As a practical application, the security of a quantum key distribution （QKD） scheme based on a symmetric two-mode Gaussian entangled state against collective Gaussian attacks is analyzed. The calculation results show that the secret key cannot be distilled when entanglement vanishes and only quantum discord exists in such a QKD scheme.

关键词： continuous variable entanglement quantum key distribution

Three-Party Quantum Key Agreement Protocol Based on continuous variable Single-Mode Squeezed States

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Communications in Theoretical Physics 2019年第12期71卷 1448-1454页

作者： Yi-Hua Zhou Jing Tan Jing Zhang Wei-Min Shi Yu-Guang Yang Faculty of Information Technology Beijing University of TechnologyBeijing 100124China Beijing Key Laboratory of Trusted Computing Beijing 100124China

The difficulty of quantum key agreement is to realize its security and fairness at the same *** paper presents a new three-party quantum key agreement protocol based on continuous variable single-mode squeezed *** three parties participating in the agreement are peer entities,making same contributions to the final *** one or two participants of the agreement cannot determine the shared key *** security analysis shows that the proposed protocol can resist both external and internal attacks.

关键词： continuous variable single-mode squeezed states quantum key agreement

continuous variable entanglement swapping in a thermal environment

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Chinese Physics B 2002年第4期11卷 339-345页

作者：刘金明李剑等 LaboratoryofQuantumCommunicationandQuantumComputation DepartmentofPhysicsUniversityofScienceandTechnologyofChinaHefei230026China LaboratoryofQuantumCommunicationandQuantumComputation DepartmentofPh

With the application of a Wigner function description of a two-mode squeezed state, we study a protocol of continuous variable entanglement swapping in a noisy quantum channel. Assuming that the two initial entangled states are coupled with the same environment, we analyse the quantum state emerging from the swapping and obtain the inseparable condition for the output correlation. It is found that there is more noise resulting from the entanglement swapping than from the direct transmission, no matter what values of displacement gain are chosen.

关键词： continuous variable entanglement swapping squeezed state Wigner function

Entanglement swapping of continuous variable using squeezed vacuum states

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Chinese Physics B 2007年第10期16卷 2885-2888页

作者：闫伟张为俊 Laboratory of Environmental Spectroscopy Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031 China Department of Physics Qufu Normal University Qufu 273165 China

We present a realistic scheme for the entanglement swapping of continuous variable, in which a two-mode squeezed vacuum state serves as a quantum channel. The position sum and momentum difference of two local modes are measured. By taking the input entangled state also as a two-mode squeezed vacuum state, we investigate the average fidelity and the yon Neumann entropy of the output state. The results show that the perfect teleportation can be achieved by increasing the squeezing of the quantum channel and that any nonzero squeezing in both the quantum channel and the input entangled state is sufficient to swap the entanglement.

关键词： entanglement swapping continuous variable squeezed vacuum states

OSCILLATION CRITERIA FOR SECOND ORDER NEUTRAL DIFFERENCE EQUATION WITH continuous variable

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Annals of Differential Equations 2005年第3期21卷 317-320页

作者： Li Fumei Li Qiaoluan Dept. of Math. Harbin Institute of Technology at Weihai Weihai 264209 College of Math. and Inform. Science Hebei Teachers＇ University Shijiazhuang 050016

In this paper, we are concerned with the second order neutral difference equation with continuous variable. Using the integral transformation and generalized Riccati transformation, we obtain some oscillation criteria.

关键词： continuous variable oscillation neutral difference equation

OSCILLATION CRITERIA FOR SECOND-ORDER NONLINEAR DIFFERENCE EQUATIONS WITH continuous variable

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Annals of Differential Equations 2004年第4期20卷 355-359页

作者：金楚华徐志庭 Faculty of Applied Math. Guangdong University of Technology Guangzhou 510090 Dept. of Math. South China Normal University Guangzhou 510631

Some new oscillation criteria are given for a second order nonlinear difference equation with continuous variable. Our results generalize and improve the recent criteria of Zhang Z.G., Bi P. and Chen J.F..

关键词： oscillation continuous variable generalized Riccati transformation

Photon subtraction-based continuous-variable measurement-device-independent quantum key distribution with discrete modulation over a fiber-to-water channel

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Communications in Theoretical Physics 2022年第3期74卷 36-43页

作者： Chao Yu Yin Li Jianzhi Ding Yun Mao Ying Guo School of Computer Science and Engineering Central South UniversityChangsha 410083China School of Automation Central South UniversityChangsha 410075China School of Computer Science Beijing University of Posts and TelecommunicationsBeijing 100876China

We propose a discrete-modulated continuous-variable measurement-device-independent quantum key distribution protocol over a fiber-to-water *** from optical fibers,the underwater channel has more severe optical attenuation because of optical absorption and scattering,which reduces the maximum communication *** enhance the performance of the protocol,the photon subtraction operation is implemented at the modulator *** carry out a performance simulation in two different kinds of seawater channel,and the result shows that the scheme with photon subtraction has a longer secure communication distance under certain conditions.

关键词： measurement-device-independent discrete modulation fiber-to-water channel continuous variable quantum key distribution