Detecting separable states via semidefinite programs

Details Detecting separable states via semidefinite programs Detecting separable states via semidefinite programs

2007-08-15

arxiv.org/abs/0708.2113v1

Physical Review A 76, 032318 (2007)

Physics

Quantum Physics

8 pages, accepted for publication in Physical Review A

Scientific paper

10.1103/PhysRevA.76.032318

We introduce a new technique to detect separable states using semidefinite programs. This approach provides a sufficient condition for separability of a state that is based on the existence of a certain local linear map applied to a known separable state. When a state is shown to be separable, a proof of this fact is provided in the form of an explicit convex decomposition of the state in terms of product states. All states in the interior of the set of separable states can be detected in this way, except maybe for a set of measure zero. Even though this technique is more suited for a numerical approach, a new analytical criterion for separability can also be derived.

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