Unification of witnessing initial system-environment correlations and witnessing non-Markovianity
Rodríguez-Rosario, C.A. Modi, K. Mazzola, L. Aspuru-Guzik, A.
Rodríguez-Rosario, C.A.
Mazzola, L.
Aspuru-Guzik, A.
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Abstract
We show the connection between a witness that detects dynamical maps with initial system-environment correlations and a witness that detects non-Markovian open quantum systems. Our analysis is based on studying the role that state preparation plays in witnessing violations of contractivity of open-quantum-system dynamics. Contractivity is a property of some quantum processes where the trace distance of density matrices decrease with time. From this, we show how a witness of initial correlations is an upper bound to a witness of non-Markovianity. We discuss how this relationship shows further connections between initial system-environment correlations and non-Markovianity, at an instance of time, in open quantum systems. Copyright © EPLA, 2012.
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EPL
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Date
2012-07
DOI
10.1209/0295-5075/99/20010
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Article