Relative entropy of entanglement of two-qubit 'X' states

doi:10.1088/1674-1056/19/11/110307

Abstract Two closest single-qubit states could be diagonalised by the same unitary matrix, which helps to find the relative entropy of entanglement of a two-qubit 'X' state. We formulate two binary equations for the relative entropy of entanglement and the corresponding closest separable state of a given two-qubit 'X' state. This approach can be applied to get the relative entropy of entanglement of many widely-discussed two-qubit states, such as pure states, Werner states, and so on.

Keywords: relative entropy of entanglement two-qubit state

Received: 24 March 2010
Revised: 03 June 2010
Accepted manuscript online:

PACS:	03.65.Fd	(Algebraic methods)
	03.65.Ud	(Entanglement and quantum nonlocality)
	03.67.Lx	(Quantum computation architectures and implementations)
	03.67.Mn	(Entanglement measures, witnesses, and other characterizations)
	05.70.Ce	(Thermodynamic functions and equations of state)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10804042), and also supported by the Scientific Research Foundation of the Education Department of Jiangxi Province, China (Project No. GJJ09440).

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Huang Jie-Hui(黄接辉), Liu Nian-Hua(刘念华), Liu Jiang-Tao(刘江涛), Yu Tian-Bao(于天宝), and He Xian(何弦) Relative entropy of entanglement of two-qubit 'X' states 2010 Chin. Phys. B 19 110307

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