Ansgar Pernice, Julius Helm, Walter T. Strunz
We determine the total state dynamics of a dephasing open quantum system
using the standard environment of harmonic oscillators. Of particular interest
are random unitary approaches to the same reduced dynamics and
system-environment correlations in the full model. Concentrating on a model
with an at times negative dephasing rate, the issue of "non-Markovianity" will
also be addressed with the emphasis on information obtained from the dynamics
of the total state of system and environment: making use of criteria that allow
us to distinguish between classically correlated and entangled total states, we
employ a simple measure for the correlations emerging from the increase of the
two local entropies, and relate it the nature of the correlations.
View original:
http://arxiv.org/abs/1202.4280
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