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Dynamics of quantum entanglement

Abstract

A model of discrete dynamics of entanglement of a 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 by an increase of von Neumann entropy of the system. We observe and discuss revivals of entanglement due to unitary interaction of subsystems. For some mixed states having different marginal entropies of the subsystems 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.

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Details

Category:
Articles
Type:
artykuł w czasopiśmie z listy filadelfijskiej
Published in:
PHYSICAL REVIEW A no. 65, edition 1, pages 1 - 9,
ISSN: 2469-9926
Language:
English
Publication year:
2002
Bibliographic description:
Życzkowski K., Horodecki P., Horodecki M., Horodecki R.: Dynamics of quantum entanglement// PHYSICAL REVIEW A. -Vol. 65., iss. 1 (2002), s.1-9
DOI:
Digital Object Identifier (open in new tab) 10.1103/physreva.65.012101
Verified by:
Gdańsk University of Technology

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