Speeding up gate operations through dissipation
摘要
It is commonly believed that decoherence is the main obstacle to quantum information processing. In contrast to this, we show how decoherence in the form of dissipation can improve the performance of certain quantum gates. As an example we consider the realisations of a controlled phase gate and a two-qubit SWAP operation with the help of a single laser pulse in atom-cavity systems. In the presence of spontaneous decay rates, the speed of the gates can be improved by a factor 2 without sacrificing high fidelity and robustness against parameter fluctuations. Even though this leads to finite gate failure rates, the scheme is comparable with other quantum computing proposals.
引用
@article{arxiv.quant-ph/0405186,
title = {Speeding up gate operations through dissipation},
author = {Almut Beige and Hugo Cable and Carsten Marr and Peter L. Knight},
journal= {arXiv preprint arXiv:quant-ph/0405186},
year = {2007}
}
备注
7 pages, 4 figures, submitted to Laser Physics, Special issue in honour of the 70th birthday of Herbert Walther