Entropy exchange, coherent information and concurrence

Yang Xiang, Shi-Jie Xiong

Published 2007-05-13, updated 2007-06-30Version 2

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.