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
Concurrence and Wigner--Yanase Skew Information
TANG Li1,2,3;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
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.
2006, Vol. 23 
