Universal decoherence induced by an environmental quantum phase transition
量子物理
2007-05-23 v1
摘要
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.
引用
@article{arxiv.quant-ph/0604136,
title = {Universal decoherence induced by an environmental quantum phase transition},
author = {Fernando Martin Cucchietti and Sonia Fernandez-Vidal and Juan Pablo Paz},
journal= {arXiv preprint arXiv:quant-ph/0604136},
year = {2007}
}