1211.6308 (Andrea Cazzaniga et al.)

Dynamical paths and universality in continuous variables noisy channels    [PDF]

Andrea Cazzaniga, Sabrina Maniscalco, Matteo G. A. Paris

We introduce an overcomplete parameter space for two-mode symmetric Gaussian states suitable to address the decoherence effects of both Markovian and non-Markovian Gaussian maps. We observe universality of the dynamical paths, which do depend only on the initial state and on the effective temperature of the environment, with the non Markovianity that manifests itself in the velocity of running over a given path. Universality is also seen in the value of discord at the separability threshold and may be exploited to build constants of motions valid for both Markovian and non-Markovian maps. We also found that the geometrical constraints provided by the structure of the parameter space imply the existence of excluded regions, i.e. sets of states which cannot be linked by any Gaussian dynamical map.

View original: http://arxiv.org/abs/1211.6308