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arXiv quant-ph/0108108quant-ph
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线性元件广义测量

Generalized measurements by linear elements

John Calsamiglia

摘要:

我给的第一个特征的类的广义测量,可以完全实现对qudits编码在不可区分的粒子,仅使用线性元件和粒子探测器。两个直接的结果从这个特性。(i)每个POVM元素的施密特数不能超过初始粒子的数量。这排除了对qudits进行完美Bell测量的任何可能性。(ii)执行广义不完全Bell测量的最大概率是1/2。

英文摘要:

I give a first characterization of the class of generalized measurements that can be exactly realized on a pair of qudits encoded in indistinguishable particles, by using only linear elements and particle detectors. Two immediate results follow from this characterization. (i) The Schmidt number of each POVM element cannot exceed the number of initial particles. This rules out any possibility of performing perfect Bell-measurements for qudits. (ii) The maximum probability of performing a generalized incomplete Bell-measurement is 1/2.

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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