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)
a Department of Physics, Beijing Institute of Technology, Beijing 100081, China; b Research Institute of Information Science, Huaihua University, Huaihua 418008, China; cDepartment of Physics and Electronic Information Science, Huaihua University, Huaihua 418008, China
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.
Received: 09 May 2008
Revised: 04 August 2008
Accepted manuscript online:
(Entanglement measures, witnesses, and other characterizations)
Fund: 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
Cite this article:
Xiang Shao-Hua(向少华), Shao Bin(邵彬), and Song Ke-Hui(宋克慧) Quantum entanglement and nonlocality properties of two-mode Gaussian squeezed states 2009 Chin. Phys. B 18 418
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