不可能比light quantum更快的通信与具有相同密度矩阵的集合的区分无关
No-relationship between impossibility of faster-than-light quantum communication and distinction of ensembles with the same density matrix
摘要：
文献中指出，超光速量子通信的不可能性源于具有相同密度矩阵的系综的不可分解性。我们表明，这两个概念是不相关的。我们认为：1）即使使用理想的单原子精度测量，通常也不可能产生具有完全相同的密度矩阵的两个系综;或者2）为了产生具有相同的密度矩阵的系综，经典通信是必要的。因此，超光速通信的不可能性并不意味着具有相同密度矩阵的系综的不可能性。
英文摘要：
It has been claimed in the literature that impossibility of faster-than-light quantum communication has an origin of indistinguishability of ensembles with the same density matrix. We show that the two concepts are not related. We argue that: 1) even with an ideal single-atom-precision measurement, it is generally impossible to produce two ensembles with exactly the same density matrix; or 2) to produce ensembles with the same density matrix, classical communication is necessary. Hence the impossibility of faster-than-light communication does not imply the indistinguishability of ensembles with the same density matrix.
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