A1 Refereed original research article in a scientific journal

Witness for initial system-environment correlations in open-system dynamics




AuthorsLaine EM, Piilo J, Breuer HP

PublisherEPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY

Publication year2010

JournalEPL

Journal name in sourceEPL

Journal acronymEPL-EUROPHYS LETT

Article numberARTN 60010

Number in series6

Volume92

Issue6

Number of pages5

ISSN0295-5075

DOIhttps://doi.org/10.1209/0295-5075/92/60010(external)

Self-archived copy’s web addresshttps://arxiv.org/abs/1004.2184(external)


Abstract
We study the evolution of a general open quantum system when the system and its environment are initially correlated. We show that the trace distance between two states of the open system can increase above its initial value, and derive tight upper bounds for the growth of the distinguishability of open-system states. This represents a generalization of the contraction property of quantum dynamical maps. The obtained inequalities can be interpreted in terms of the exchange of information between the system and the environment, and lead to a witness for system-environment correlations which can be determined through measurements on the open system alone. Copyright (C) EPLA, 2010



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