Entropy exchange, coherent information, and concurrence
Yang Xiang, Shi‐Jie Xiong · Physical Review A · 2007
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 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.