Unification of witnessing initial system-environment correlations and witnessing non-Markovianity

作者：Rodriguez Rosario C A^*; Modi K; Mazzola L; Aspuru Guzik A

来源：EPL, 2012, 99(2): 20010.

DOI：10.1209/0295-5075/99/20010

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.

• 出版日期2012-7