Entropy exchange, coherent information and concurrence

Abstract

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.

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

References in corpus (1)

• Entanglement fidelity and measurement of entanglement preserving in quantum processes

Cited by in corpus (1)

• Non-local dynamics of Bell states in separate cavities