中国物理B ›› 2006, Vol. 15 ›› Issue (8): 1766-1771.doi: 10.1088/1009-1963/15/8/022

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Continuous-variable quantum teleportation of even and odd coherent states through varied gain channels

张　静1, 张俊香1, 张天才1, 李　英2   

  1. (1)State Key Laboratory of Quantum Optics and Quantum Optics Devices,Shanxi University, Taiyuan 030006 China; (2)State Key Laboratory of Quantum Optics and Quantum Optics Devices,Shanxi University, Taiyuan 030006 China;Institute of Quantum Optics Quantum Information Science and Department of Physics,Shangluo Normal College, Shangzhou, 726000, China
  • 收稿日期:2005-09-01 修回日期:2006-01-21 出版日期:2006-08-20 发布日期:2006-08-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10434080, 10374062, 60578018),NSFC-RFBR Joint Program, Research Funds for Returned Scholar Abroad from Shanxi Province and also supported by the CFKSTIP (Grant No 705010) and PCSIRT from Ministry of Education of China.

Continuous-variable quantum teleportation of even and odd coherent states through varied gain channels

Li Ying(李英)a) b), Zhang Jing(张静)a), Zhang Jun-Xiang(张俊香)a), and Zhang Tian-Cai(张天才)a)†   

  1. a State Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University, Taiyuan 030006, China; b Institute of Quantum Optics Quantum Information Science and Department of Physics, Shangluo Normal College, Shangzhou 726000, China
  • Received:2005-09-01 Revised:2006-01-21 Online:2006-08-20 Published:2006-08-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10434080, 10374062, 60578018),NSFC-RFBR Joint Program, Research Funds for Returned Scholar Abroad from Shanxi Province and also supported by the CFKSTIP (Grant No 705010) and PCSIRT from Ministry of Education of China.

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摘要： This paper has investigated quantum teleportation of even and odd coherent states in terms of the EPR entanglement states for continuous variables. It discusses the relationship between the fidelity and the entanglement of EPR states, which is characterized by the degree of squeezing and the gain of classical channels. It shows that the quality of teleporting quantum states also depends on the characteristics of the states themselves. The properties of teleporting even and odd coherent states at different intensities are investigated. The difference of teleporting two such kinds of quantum states are analysed based on the quantum distance function.

关键词: quantum teleportation, odd and even coherent state, fidelity

Abstract: This paper has investigated quantum teleportation of even and odd coherent states in terms of the EPR entanglement states for continuous variables. It discusses the relationship between the fidelity and the entanglement of EPR states, which is characterized by the degree of squeezing and the gain of classical channels. It shows that the quality of teleporting quantum states also depends on the characteristics of the states themselves. The properties of teleporting even and odd coherent states at different intensities are investigated. The difference of teleporting two such kinds of quantum states are analysed based on the quantum distance function.

Key words: quantum teleportation, odd and even coherent state, fidelity

中图分类号:  (Quantum communication)

  • 03.67.Hk
03.65.Ud (Entanglement and quantum nonlocality) 03.65.Ge (Solutions of wave equations: bound states) 03.67.Mn (Entanglement measures, witnesses, and other characterizations)