Universal decoherence induced by an environmental quantum phase transition

Details Universal decoherence induced by an environmental quantum phase transition Universal decoherence induced by an environmental quantum phase transition

2006-04-18

arxiv.org/abs/quant-ph/0604136v1

Phys. Rev. A 75, 032337 (2007)

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevA.75.032337

Decoherence induced by coupling a system with an environment may display universal features. Here we demostrate that when the coupling to the system drives a quantum phase transition in the environment, the temporal decay of quantum coherences in the system is Gaussian with a width independent of the system-environment coupling strength. The existence of this effect opens the way for a new type of quantum simulation algorithm, where a single qubit is used to detect a quantum phase transition. We discuss possible implementations of such algorithm and we relate our results to available data on universal decoherence in NMR echo experiments.

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