A1 Refereed original research article in a scientific journal
Witness for initial system-environment correlations in open-system dynamics
Authors: Laine EM, Piilo J, Breuer HP
Publisher: EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY
Publication year: 2010
Journal: EPL
Journal name in source: EPL
Journal acronym: EPL-EUROPHYS LETT
Article number: ARTN 60010
Number in series: 6
Volume: 92
Issue: 6
Number of pages: 5
ISSN: 0295-5075
DOI: https://doi.org/10.1209/0295-5075/92/60010(external)
Self-archived copy’s web address: https://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
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