Regensburg 2004 – scientific programme
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DY: Dynamik und Statistische Physik
DY 50: Entanglement and Decoherence
DY 50.3: Talk
Friday, March 12, 2004, 11:00–11:15, H2
Exact decoherence to pointer states in free open quantum systems is universal — •Jens Eisert — Institut für Physik, Universität Potsdam, Am Neuen Palais 10, D-14469 Potsdam
In this talk it is shown that exact decoherence to minimal uncertainty Gaussian pointer states is generic for free quantum particles coupled to a heat bath. More specifically, the paper is concerned with damped free particles linearly coupled to a heat bath at arbitrary temperature, with arbitrary coupling strength and spectral densities covering the ohmic, subohmic, and supraohmic regime. Then it is true that there exists a time tc such that for times t>tc the state can always be exactly represented as a mixture (convex combination) of particular minimal uncertainty Gaussian states, regardless of the initial state. This exact ‘localisation’ is hence not only a feature of the high temperature and weak damping limit, but rather a generic property of damped free particles.