Physics – Quantum Physics
Scientific paper
2010-06-15
Phys. Rev. A 82, 052310 (2010)
Physics
Quantum Physics
6 pages
Scientific paper
We provide a class of optimal nondecomposable entanglement witnesses for 4N x 4N composite quantum systems or, equivalently, a new construction of nondecomposable positive maps in the algebra of 4N x 4N complex matrices. This construction provides natural generalization of the Robertson map. It is shown that their structural physical approximations give rise to entanglement breaking channels.
Chruscinski Dariusz
Pytel Justyna
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