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Entanglement Manipulation for a Two-Mode Squeezed Vacuum State |
| ZHOU Qing-Ping1,2,3;FANG Mao-Fa1,2;LIU Xiao-Juan1,2;CHEN Xiao-Mei1,2;WU Qin1 |
| 1Department of Physics, Hunan Normal University, Changsha 410081
2Anhui Institute Optics and Fine Mechanics, Chinese Academy of ScienceS, Hefei 230031
3Department of Mathematics and Computer Science, Jishou University, Zhangjiajie 427000 |
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ZHOU Qing-Ping, FANG Mao-Fa, LIU Xiao-Juan et al 2004 Chin. Phys. Lett. 21 1692-1694 |
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Abstract By numerically analysing the entropy of entanglement of the output state from a Mach--Zehnder interferometer for the two-mode squeezed vacuum state input, it is found that if the internal phase shift of the interferometer is adjusted to the value of 0 or π, the entangling characteristic of the input state is efficiently preserved at the output. If the internal phase shift is tuned to the value of π, the two-mode squeezed vacuum state is completely disentangled at the output of the setup. If the internal phase shift deviates from the above values, the input state is degraded into a partially entangled output state. Based on these results, a method for optically realizing the entanglement preservation, entanglement degradation, and disentanglement via the interferometer is obtained.
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| Keywords:
03.67.Mn
03.67.Hk
03.67.-a
03.67.Ud
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Published: 01 September 2004
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