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Non-Markov Control of Quantum Thermodynamics in Multipartite Systems

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Abstract

We predict [1] drastic deviations from ordinary thermodynamic trends, which are monotonic approach to thermal equilibrium and positive entropy production, when qubits coupled to bosonic baths are probed on non-Markovian time scales by quantum nondemolition measurements, as well as coherently modulated. The resulting changes in the temperature, entropy and state-purity of both the system and the bath only depend on the rate of measurement, without any rapport to thermodynamic laws. These effects in principle allow much faster cooling and state purification than other methods. Generalizations of these effects to entangled multipartite systems [2] controlled by local measurements and modulations bring about surprising dynamic changes in the entanglement. Collective bosonic states coupled to a bath are shown to obey similar principles [3].

© 2008 Optical Society of America

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