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Critical dynamics of decoherence

By Bogdan Damski, H. T. Quan and Wojciech H. Zurek

Abstract

We study decoherence induced by a dynamic environment undergoing a quantum phase transition. Environment's susceptibility to perturbations - and, consequently, efficiency of decoherence - is amplified near a critical point. Over and above this near-critical susceptibility increase, we show that decoherence is dramatically enhanced by non-equilibrium critical dynamics of the environment. We derive a simple expression relating decoherence to the universal critical exponents exhibiting deep connections with the theory of topological defect creation in non-equilibrium phase transitions.Comment: 8 pages; version accepted in PR

Topics: Quantum Physics, Condensed Matter - Statistical Mechanics, High Energy Physics - Theory
Publisher: 'American Physical Society (APS)'
Year: 2011
DOI identifier: 10.1103/PhysRevA.83.062104
OAI identifier: oai:arXiv.org:0911.5729

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