Detecting entanglement of states by entries of their density matrices

Details Detecting entanglement of states by entries of their density matrices Detecting entanglement of states by entries of their density matrices

2010-10-11

arxiv.org/abs/1010.2078v2

Physics

Quantum Physics

14 pages

Scientific paper

For any bipartite systems, a universal entanglement witness of rank-4 for
pure states is obtained and a class of finite rank entanglement witnesses is
constructed. In addition, a method of detecting entanglement of a state only by
entries of its density matrix with respect to some product basis is obtained.

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