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arXiv 1409.4017quant-ph
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弱测量的量子关联代价

Quantum correlation cost of the weak measurement

Jun Zhang, Shao-xiong Wu, Chang-shui Yu

摘要:

在迹范数的基础上,提出了表征弱测量过程中量子相关利用程度的量子相关代价(QCC)。结果表明,QCC与基于迹范数的量子不和谐(TQD)之间的关系仅由弱测量强度决定,因此与TQD相比,QCC只能捕捉到量子系统的部分量子性.我们还发现,剩余量子不仅可以“提取”进一步冯诺依曼测量,但也可以通过一系列的无穷小弱测量。作为一个例子,我们证明了我们的结果的贝尔对角态。

英文摘要:

Quantum correlation cost (QCC) characterizing how much quantum correlation is used in a weak-measurement process is presented based on the trace norm. It is shown that the QCC is related to the trace-norm-based quantum discord (TQD) by only a factor that is determined by the strength of the weak measurement, so it only catches partial quantumness of a quantum system compared with the TQD. We also find that the residual quantumness can be `extracted' not only by the further von Neumann measurement, but also by a sequence of infinitesimal weak measurements. As an example, we demonstrate our outcomes by the Bell-diagonal state.

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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