Simplified and obvious expression of concurrence in Wootters' measure of entanglement of a pair of qubits

Details Simplified and obvious expression of concurrence in Wootters' measure of entanglement of a pair of qubits Simplified and obvious expression of concurrence in Wootters' measure of entanglement of a pair of qubits

2002-08-06

arxiv.org/abs/quant-ph/0208036v1

Chinese Phys. Lett. Vol.20, 1907(2003) [a little revision]

Physics

Quantum Physics

5 pages

Scientific paper

10.1088/0256-307X/20/11/001

We obtain a simplified and obvious expression of "concurrence" in Wootters' measure of entanglement of a pair of qubits having no more than two non-zero eigenvalues in terms of concurrences of eigenstates and their simple combinations. It not only simplifies the calculation of Wootters' measure of entanglement, but also reveals some its general and important features. Our conclusions are helpful to understand and use quantum entanglement further.

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