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理论物理通讯：英文版

Entanglement Transfer from Two-Mode Squeezed Vacuum State Field to Two Spatially Separated Atoms in Two-Photon Processes

Cui, Huiping, Zou, Jian JIAN, LI ., Shao

Published Jan 1, 2008• 1 citation
OpenAlex

Abstract

我们在二光子的过程从二模式的挤压的真空状态地在纠纷转移上调查空移动的影响到二个空间地分开的原子。我们的结果证明空移动在如此的纠纷转移起一个重要作用。我们发现当空移动参数 r 是小的时，在二个原子之间的纠纷的度与首先增加压榨的参数 ξ 增加，并且在完成它的最大的价值以后，纠纷的度将与增加 &#958 减少到零；当时为大 r， E 将与增加 ξ 增加。

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我们在二光子的过程从二模式的挤压的真空状态地在纠纷转移上调查空移动的影响到二个空间地分开的原子。我们的结果证明空移动在如此的纠纷转移起一个重要作用。我们发现当空移动参数 r 是小的时，在二个原子之间的纠纷的度与首先增加压榨的参数 ξ 增加，并且在完成它的最大的价值以后，纠纷的度将与增加 &#958 减少到零；当时为大 r， E 将与增加 ξ 增加。
We investigate the influence of the Stark shift on the entanglement transfer from the two-mode squeezed vacuum state field to two spatially separated atoms in two-photon processes. Our results show that the Stark shift plays an important role in such entanglement transfer. We find that when the Stark shift parameter r is small, the degree of entanglement between the two atoms increases with the increasing of the squeezing parameter ξ first, and after achieving its maximal value, the degree of entanglement will decrease to zero with the increasing of ξ; while for big r, E will increase with the increasing of ξ.
We introduce states a † m | ξ ⟩ and a m | ξ ⟩, where| ξ ⟩ is a two-mode squeezed vacuum state. We examine the properties of these states by analytic derivation. Because of the entanglement between the modes of the field, photon adding (or substracting) for one of the modes results in interesting outcomes. For a two-mode squeezed vacuum state, the effect of annihilation of m a-photons is just the same as creation of m b-photons. Annihilation of photons of mode a (or mode b ) actually increases the mean number of photons of mode a and mode b . We also calculate Mandel Q parameter, cross-correlation function and squeezing of the field.