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论文类型：期刊论文

发表时间：2014-12-01

发表刊物：ANNALS OF PHYSICS

收录刊物：SCIE、Scopus

卷号：351

页面范围：104-111

ISSN号：0003-4916

关键字：Weak measurement; Trace norm; Quantum correlation cost

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. (C) 2014 Published by Elsevier Inc.