中国物理B ›› 2009, Vol. 18 ›› Issue (2): 418-425.doi: 10.1088/1674-1056/18/2/007

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Quantum entanglement and nonlocality properties of two-mode Gaussian squeezed states

邵彬1, 向少华2, 宋克慧3   

  1. (1)Department of Physics, Beijing Institute of Technology, Beijing 100081, China; (2)Department of Physics, Beijing Institute of Technology, Beijing 100081, China;Research Institute of Information Science, Huaihua University, Huaihua 418008, China;Department of Physics and Electronic Information Science, Huaihua University, Huaihua 418008; (3)Research Institute of Information Science, Huaihua University, Huaihua 418008, China;Department of Physics and Electronic Information Science, Huaihua University, Huaihua 418008, China
  • 收稿日期:2008-05-09 修回日期:2008-08-04 出版日期:2009-02-20 发布日期:2009-02-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10374007), the Natural Science Foundation of Hunan Province (Grant No 06jj50014), the Natural Science Foundation of the Education Department of Hunan Province, China (Grant No

Quantum entanglement and nonlocality properties of two-mode Gaussian squeezed states

Xiang Shao-Hua(向少华)a)b)c)†, Shao Bin(邵彬)a), and Song Ke-Hui(宋克慧)b)c)   

  1. a Department of Physics, Beijing Institute of Technology, Beijing 100081, China; b Research Institute of Information Science, Huaihua University, Huaihua 418008, China; c Department of Physics and Electronic Information Science, Huaihua University, Huaihua 418008, China
  • Received:2008-05-09 Revised:2008-08-04 Online:2009-02-20 Published:2009-02-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10374007), the Natural Science Foundation of Hunan Province (Grant No 06jj50014), the Natural Science Foundation of the Education Department of Hunan Province, China (Grant No

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摘要： Quantum entanglement and nonlocality properties of a family of two-mode Gaussian pure states have been investigated. The results show that the entanglement of these states is determined by both the two-mode squeezing parameter and the difference of the two single-mode squeezing parameters. For the same two-mode squeezing parameter, these states show larger entanglement than the usual two-mode squeezed vacuum state. The violation of Bell inequality depends strongly on all the squeezing parameters of these states and disappears completely in the limit of large squeezing. In particular, these states can exhibit much stronger violation of local realism than two-mode squeezed vacuum state in the range of experimentally available squeezing values.

关键词: entanglement, nonlocality, Gaussian state

Abstract: Quantum entanglement and nonlocality properties of a family of two-mode Gaussian pure states have been investigated. The results show that the entanglement of these states is determined by both the two-mode squeezing parameter and the difference of the two single-mode squeezing parameters. For the same two-mode squeezing parameter, these states show larger entanglement than the usual two-mode squeezed vacuum state. The violation of Bell inequality depends strongly on all the squeezing parameters of these states and disappears completely in the limit of large squeezing. In particular, these states can exhibit much stronger violation of local realism than two-mode squeezed vacuum state in the range of experimentally available squeezing values.

Key words: entanglement, nonlocality, Gaussian state

中图分类号:  (Entanglement and quantum nonlocality)

  • 03.65.Ud
42.50.Dv (Quantum state engineering and measurements) 03.67.Mn (Entanglement measures, witnesses, and other characterizations)