2004/05/30 by Almut Beige, Hugo Cable, Carsten Marr +1
Physics and Astronomy · #quant-ph
published as Laser Phys. 15, 162 (2005). · 7 pages, 4 figures, submitted to Laser Physics, Special issue in honour of the 70th birthday of Herbert Walther
arxiv created 2004/05/30 · arxiv updated 2009/12/01
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.