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Witness for initial system-environment correlations in open-system dynamics
Tekijät: Laine EM, Piilo J, Breuer HP
Kustantaja: EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY
Julkaisuvuosi: 2010
Journal: EPL
Tietokannassa oleva lehden nimi: EPL
Lehden akronyymi: EPL-EUROPHYS LETT
Artikkelin numero: ARTN 60010
Numero sarjassa: 6
Vuosikerta: 92
Numero: 6
Sivujen määrä: 5
ISSN: 0295-5075
DOI: https://doi.org/10.1209/0295-5075/92/60010
Rinnakkaistallenteen osoite: https://arxiv.org/abs/1004.2184
Tiivistelmä
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
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