中国物理B ›› 2004, Vol. 13 ›› Issue (11): 1881-1886.doi: 10.1088/1009-1963/13/11/020

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Entanglement and disentanglement from cascade beam-splitter for squeezed vacuum state inputs

徐洪智1, 方卯发2, 刘小娟2, 陈笑梅2, 吴琴2, 周清平3   

  1. (1)Department of Information and Automatization, Jishou University, Zhangjiajie 427000, China; (2)Department of Physics, Hunan Normal University, Changsha 410081, China; Anhui Institute Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China; (3)Department of Physics, Hunan Normal University, Changsha 410081, China; Anhui Institute Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China; Department of Information and Automatization, Jishou University, Zhangjiajie 427000, China
  • 收稿日期:2004-05-14 修回日期:2004-07-14 出版日期:2004-11-20 发布日期:2005-06-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10374025).

Entanglement and disentanglement from cascade beam-splitter for squeezed vacuum state inputs

Zhou Qing-Ping (周清平)abc, Fang Mao-Fa (方卯发)ab, Liu Xiao-Juan (刘小娟)ab, Chen Xiao-Mei (陈笑梅)ab, Wu Qin (吴琴)ab, Xu Hong-Zhi (徐洪智)c    

  1. a Department of Physics, Hunan Normal University, Changsha 410081, China; b Anhui Institute Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China; c Department of Information and Automatization, Jishou University, Zhangjiajie 427000, China
  • Received:2004-05-14 Revised:2004-07-14 Online:2004-11-20 Published:2005-06-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10374025).

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摘要： Properties of the entanglement at the outputs of a cascade beam-splitter are investigated for two single-mode squeezed vacuum state inputs. It is shown that the entanglement depends on the squeezing amplitudes of the input states and the reflection coefficients of the cascade beam-splitter, and the composite phase shift Δ between the cascade beam-splitter and the input fields has a great effect on the entanglement. In particular, the properties of the entanglement of a cascade beam-splitter differ from those of only one beam-splitter. A further method for manipulating entanglement by adjusting the parameters of the cascade beam-splitter and the input fields is proposed.

关键词: entanglement, disentanglement, cascade beam-splitter, squeezed vacuum states

Abstract: Properties of the entanglement at the outputs of a cascade beam-splitter are investigated for two single-mode squeezed vacuum state inputs. It is shown that the entanglement depends on the squeezing amplitudes of the input states and the reflection coefficients of the cascade beam-splitter, and the composite phase shift Δ between the cascade beam-splitter and the input fields has a great effect on the entanglement. In particular, the properties of the entanglement of a cascade beam-splitter differ from those of only one beam-splitter. A further method for manipulating entanglement by adjusting the parameters of the cascade beam-splitter and the input fields is proposed.

Key words: entanglement, disentanglement, cascade beam-splitter, squeezed vacuum states

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) 42.79.Fm (Reflectors, beam splitters, and deflectors)