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arXiv 1107.2409quant-ph
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利用局域位移提高高斯态的纠缠浓度

Improving entanglement concentration of Gaussian states by local displacements

Jaromir Fiurasek

摘要:

利用局域单光子减法结合局域高斯操作研究了连续变量高斯态的纠缠浓度。我们首先分析了Zhang和van Loock最近提出的局域压缩增强纠缠浓度协议[e-print:arXiv:1103.4500(2011)],并讨论了光子相减前的局域压缩有助于增加协议输出态纠缠的机制。接下来我们证明了用局域相干位移代替单模压缩也可以得到类似的纠缠改善。

英文摘要:

We investigate entanglement concentration of continuous-variable Gaussian states by local single-photon subtractions combined with local Gaussian operations. We first analyze the local squeezing-enhanced entanglement concentration protocol proposed very recently by Zhang and van Loock [e-print: arXiv:1103.4500 (2011)] and discuss the mechanism by which local squeezing before photon subtraction helps to increase the entanglement of the output state of the protocol. We next show that a similar entanglement improvement can be achieved by using local coherent displacements instead of single-mode squeezing.

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