TY  - JOUR
A1  - Lorenz, Ulf
A1  - Saalfrank, Peter
T1  - Measures for the non-Markovianity of a harmonic oscillator coupled to a discrete bath derived from numerically exact references
T2  - The European physical journal : D, Atomic, molecular, optical and plasma physics
N2  - System-bath problems in physics and chemistry are often described by Markovian master equations. However, the Markov approximation, i.e., neglect of bath memory effects is not always justified, and different measures of non-Markovianity have been suggested in the literature to judge the validity of this approximation. Here we calculate several computable measures of non-Markovianity for the non-trivial problem of a harmonic oscillator coupled to a large number of bath oscillators. The Multi Configurational Time Dependent Hart ree nietliod is used to provide a numerically converged solution of the system-bath Schrodinger equation, from which the appropriate quantities can be calculated. In particular, we consider measures based on trace-distances and quantum discord for a variety of initial states. These quantities have proven useful in the case of two-level and other small model systems Tpically encountered in quantum optics; but are less straightforward to interpret for the more complex model systems that are relevant for chemical physics.
Y1  - 2015
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/39156
SN  - 1434-6060
SN  - 1434-6079
VL  - 69
IS  - 2
PB  - Springer
CY  - New York
ER  -