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arXiv quant-ph/9811078quant-ph
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马赫-曾德尔干涉仪输出端的纠缠度和可见度

Entanglement and visibility at the output of a Mach-Zehnder interferometer

Matteo G. A. Paris

摘要:

研究了任意压缩参数的压缩相干态对从马赫-曾德尔干涉仪输出的两光束间的纠缠。输出端的量子关联是干涉仪内部相移的函数,输出态的范围从完全解纠缠态到纠缠度是输入压缩参数的增函数的状态。在输入端的一对压缩真空导致在输出端的最大纠缠态。对测量符合计数率或平方差光电流产生的条纹进行了评价和比较。在几乎所有的情况下,除了非常低的信号范围外,类同达因检测被证明是优选的。

英文摘要:

We study the entanglement between the two beams exiting a Mach-Zehnder interferometer fed by a couple of squeezed-coherent states with arbitrary squeezing parameter. The quantum correlations at the output are function of the internal phase-shift of the interferometer, with the output state ranging from a totally disentangled state to a state whose degree of entanglement is an increasing function of the input squeezing parameter. A couple of squeezed vacuum at the input leads to maximum entangled state at the output. The fringes visibilities resulting from measuring the coincidence counting rate or the squared difference photocurrent are evaluated and compared each other. Homodyne-like detection turns out to be preferable in almost all situations, with the exception of the very low signals regime.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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