Separable approximation for mixed states of composite quantum systems

Details Separable approximation for mixed states of composite quantum systems Separable approximation for mixed states of composite quantum systems

2001-04-19

arxiv.org/abs/quant-ph/0104098v3

Physics

Quantum Physics

13 pages, no figures; minor changes; accepted for publication in PRA

Scientific paper

10.1103/PhysRevA.64.052302

We describe a purely algebraic method for finding the best separable
approximation to a mixed state of a composite 2x2 quantum system, consisting of
a decomposition of the state into a linear combination of a mixed separable
part and a pure entangled one. We prove that, in a generic case, the weight of
the pure part in the decomposition equals the concurrence of the state.

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