Bang-Bang control of a qubit coupled to a quantum critical spin bath
Quantum Physics
2008-05-20 v2
Abstract
We analytically and numerically study the effects of pulsed control on the decoherence of a qubit coupled to a quantum spin bath. When the environment is critical, decoherence is faster and we show that the control is relatively more effective. Two coupling models are investigated, namely a qubit coupled to a bath via a single link and a spin star model, yielding results that are similar and consistent.
Keywords
Cite
@article{arxiv.0802.2859,
title = {Bang-Bang control of a qubit coupled to a quantum critical spin bath},
author = {Davide Rossini and Paolo Facchi and Rosario Fazio and Giuseppe Florio and Daniel A. Lidar and Saverio Pascazio and Francesco Plastina and Paolo Zanardi},
journal= {arXiv preprint arXiv:0802.2859},
year = {2008}
}
Comments
10 pages, 4 figures, replaced with published version