Critical dynamics of decoherence

Details Critical dynamics of decoherence Critical dynamics of decoherence

2009-11-30

arxiv.org/abs/0911.5729v3

Phys. Rev. A83: 062104,2011

Physics

Quantum Physics

8 pages; version accepted in PRA

Scientific paper

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.

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