Entanglement swapping  of continuous variable using squeezed vacuum states

doi:10.1088/1009-1963/16/10/010

中国物理B ›› 2007, Vol. 16 ›› Issue (10): 2885-2888.doi: 10.1088/1009-1963/16/10/010

Entanglement swapping of continuous variable using squeezed vacuum states

张为俊¹, 闫伟²

(1)Laboratory of Environmental Spectroscopy, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China; (2)Laboratory of Environmental Spectroscopy, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China；Department of Physics, Qufu Normal University, Qufu 273165, China

收稿日期:2007-02-01 修回日期:2007-03-18 出版日期:2007-10-08 发布日期:2007-10-08
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No~20477043).

Entanglement swapping of continuous variable using squeezed vacuum states

Yan Wei(闫伟)^a)b)† and Zhang Wei-Jun(张为俊)^a)

^a Laboratory of Environmental Spectroscopy, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China; ^b Department of Physics, Qufu Normal University, Qufu 273165, China

Received:2007-02-01 Revised:2007-03-18 Online:2007-10-08 Published:2007-10-08
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No~20477043).

摘要/Abstract

摘要： We present a realistic scheme for the entanglement swapping of continuous variable, in which a two-mode squeezed vacuum state serves as a quantum channel. The position sum and momentum difference of two local modes are measured. By taking the input entangled state also as a two-mode squeezed vacuum state, we investigate the average fidelity and the von Neumann entropy of the output state. The results show that the perfect teleportation can be achieved by increasing the squeezing of the quantum channel and that any nonzero squeezing in both the quantum channel and the input entangled state is sufficient to swap the entanglement.

关键词: entanglement swapping, continuous variable, squeezed vacuum states

Abstract: We present a realistic scheme for the entanglement swapping of continuous variable, in which a two-mode squeezed vacuum state serves as a quantum channel. The position sum and momentum difference of two local modes are measured. By taking the input entangled state also as a two-mode squeezed vacuum state, we investigate the average fidelity and the von Neumann entropy of the output state. The results show that the perfect teleportation can be achieved by increasing the squeezing of the quantum channel and that any nonzero squeezing in both the quantum channel and the input entangled state is sufficient to swap the entanglement.

Key words: entanglement swapping, continuous variable, squeezed vacuum states

中图分类号: (Entanglement and quantum nonlocality)

03.65.Ud

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

闫伟, 张为俊. Entanglement swapping of continuous variable using squeezed vacuum states[J]. 中国物理B, 2007, 16(10): 2885-2888.

Yan Wei(闫伟) and Zhang Wei-Jun(张为俊). Entanglement swapping of continuous variable using squeezed vacuum states[J]. Chinese Physics, 2007, 16(10): 2885-2888.

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Entanglement swapping of continuous variable using squeezed vacuum states

Entanglement swapping of continuous variable using squeezed vacuum states

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