Physics – Quantum Physics
Scientific paper
2000-08-27
Phys. Rev. A, 65 012101 (2002)
Physics
Quantum Physics
10 pages, Revtex, 10 figures, refined version
Scientific paper
10.1103/PhysRevA.65.012101
A model of discrete dynamics of entanglement of bipartite quantum state is considered. It involves a global unitary dynamics of the system and periodic actions of local bistochastic or decaying channel. For initially pure states the decay of entanglement is accompanied with an increase of von Neumann entropy of the system. We observe and discuss revivals of entanglement due to unitary interaction of both subsystems. For some mixed states having different marginal entropies of both subsystems (one of them larger than the global entropy and the other one one smaller) we find an asymmetry in speed of entanglement decay. The entanglement of these states decreases faster, if the depolarizing channel acts on the "classical" subsystem, characterized by smaller marginal entropy.
Horodecki Michal
Horodecki Pawel
Horodecki Ryszard
Zyczkowski Karol
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