Entropy exchange, coherent information and concurrence

Details Entropy exchange, coherent information and concurrence Entropy exchange, coherent information and concurrence

2007-05-13

arxiv.org/abs/0705.1813v2

Phys. Rev. A 76, 014306 (2007)

Physics

Quantum Physics

4 pages, 8 figures v2: version accepted for publication in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.76.014306

For a simple model we derive analytic expressions of entropy exchange and coherent information, from which relations between them and the concurrence are drawn. We find that in the quantum evolution the entropy exchange exhibits behavior \textsl{opposite} to that of the concurrence, whereas the coherent information shows features very similar to those of the concurrence. The meaning of this result for general systems is discussed.

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