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
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.
Received: 14 May 2004
Revised: 14 July 2004
Accepted manuscript online:
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