Physics – Quantum Physics
Scientific paper
2010-07-27
Phys. Rev. A 82, 042119 (2010)
Physics
Quantum Physics
20 pages, 6 figures. Revised version to appear in Phys. Rev. A, description of the tripartite case added
Scientific paper
We study entanglement dynamics in quantum Brownian motion (QBM) models. Our main tool is the Wigner function propagator. Time evolution in the Wigner picture is physically intuitive and it leads to a simple derivation of a master equation for any number of system harmonic oscillators and spectral density of the environment. It also provides generalized uncertainty relations, valid for any initial state that allow a characterization of the environment in terms of the modifications it causes to the system's dynamics. In particular, the uncertainty relations are very informative about the entanglement dynamics of Gaussian states, and to a lesser extent for other families of states. For concreteness, we apply these techniques to a bipartite QBM model, describing the processes of entanglement creation, disentanglement and decoherence at all temperatures and timescales.
Anastopoulos Charis
Kechribaris S.
Mylonas D.
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