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arXiv quant-ph/0004059quant-ph
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从相空间函数采样正则相

Sampling the canonical phase from phase-space functions

J. Fiurasek, M. Dakna, T. Opatrny, D. -G. Welsch

摘要:

我们讨论了从s参数化相空间函数中采样正则相指数矩的可能性。我们证明了采样核的存在,并且对于任何s>-1都是良好的,而对于s=-1,核在原点发散。尽管如此,我们表明,相空间的时刻,可以从Q-函数中测量的双零差计划与完美的检测器的任何预定义的精度进行采样。我们讨论了不完美的检测和地址使用其他可测量的相空间函数的采样方案的影响。最后,我们讨论了正则相位分布本身的采样问题。

英文摘要:

We discuss the possibility of sampling exponential moments of the canonical phase from the s-parametrized phase space functions. We show that the sampling kernels exist and are well-behaved for any s>-1, whereas for s=-1 the kernels diverge in the origin. In spite of that we show that the phase space moments can be sampled with any predefined accuracy from the Q-function measured in the double-homodyne scheme with perfect detectors. We discuss the effect of imperfect detection and address sampling schemes using other measurable phase-space functions. Finally, we discuss the problem of sampling the canonical phase distribution itself.

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