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arXiv 1706.04151math-phmath.MPquant-ph
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POVM的谱间隙

A spectral gap for POVMs

Victoria Kaminker, Leonid Polterovich, Dor Shmoish

摘要:

对于一类正算子值的措施,我们引入了谱隙,一个不变的出现在一些情况下:负责的量子测量的不清晰度的量子噪声运营商,马尔可夫链描述的状态减少重复量子测量,和Berezin变换紧凑的Kahler流形。光谱间隙承认一个透明的描述在某些度量测度空间的几何形状,是有关的扩散距离,并表现出强大的行为扰动下的Wasserstein度量。

英文摘要:

For a class of positive operator valued measures, we introduce the spectral gap, an invariant which shows up in a number of contexts: the quantum noise operator responsible for the unsharpness of quantum measurements, the Markov chain describing the state reduction for repeated quantum measurements, and the Berezin transform on compact Kahler manifolds. The spectral gap admits a transparent description in terms of geometry of certain metric measure spaces, is related to the diffusion distance, and exhibits a robust behaviour under perturbations in the Wasserstein metric.

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