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论文类型：期刊论文

发表时间：2019-02-01

发表刊物：ANNALEN DER PHYSIK

收录刊物：SCIE、EI

卷号：531

期号：2

ISSN号：0003-3804

关键字：quantum correlation; quantum discord; quantum non-locality

摘要：One of the greatest challenges in developing the resource theory of a quantum feature is to establish an analytically computable quantifier, which directly limits the practicability of such quantifiers. Here, analytic quantifiers of both the symmetric quantum discord (SQD) and the symmetric measurement-induced nonlocality (SMIN) in a bipartite system of qubits are studied on the basis of the quantum skew information. It is shown that the SMIN of any two-qubit system and the SQD of bipartite "X"-type states and block-diagonal states can be analytically determined. In addition, the SQD and the SMIN are invariant with an attached quantum state. The validity of our analytical expressions is further illustrated numerically on the basis of several randomly generated density matrices.