Separability and Entanglement of Quantum States Based on Covariance Matrices

Details Separability and Entanglement of Quantum States Based on Covariance Matrices Separability and Entanglement of Quantum States Based on Covariance Matrices

2008-05-12

arxiv.org/abs/0805.1632v1

J. Phys. A 41, Math. Theor.(2008)202002

Physics

Quantum Physics

11 pages

Scientific paper

10.1088/1751-8113/41/20/202002

We investigate the separability of quantum states based on covariance
matrices. Separability criteria are presented for multipartite states. The
lower bound of concurrence proposed in Phys. Rev. A. 75, 052320 (2007) is
improved by optimizing the local orthonormal observables.

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