Concurrence and Wigner--Yanase Skew Information

Chin. Phys. Lett.

2006, Vol. 23

Issue (3): 542-544 DOI:

Original Articles

Concurrence and Wigner--Yanase Skew Information

TANG Li^1,2,3;CHEN Ze-Qian⁴

¹State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071 ²Center for Cold Atom Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071 ³Graduate School of Chinese Academy of Sciences, Beijing 100049 ⁴State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics and Laboratory of Mathematical Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071

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TANG Li, CHEN Ze-Qian 2006 Chin. Phys. Lett. 23 542-544

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Abstract A measure of entanglement on n qubits is defined in terms of Wigner--Yanase skew information. It is shown that the measure coincides essentially with the concurrence on two qubits. This uncovers the information-theoretic meaning of the concurrence of entangled states.

Keywords: 03.65.Ud 03.67.-a

Published: 01 March 2006

PACS:	03.65.Ud	(Entanglement and quantum nonlocality)
	03.67.-a	(Quantum information)

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https://cpl.iphy.ac.cn/ OR https://cpl.iphy.ac.cn/Y2006/V23/I3/0542

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