Speeding up gate operations through dissipation

Details Speeding up gate operations through dissipation Speeding up gate operations through dissipation

2004-05-30

arxiv.org/abs/quant-ph/0405186v1

Laser Phys. 15, 162 (2005).

Physics

Quantum Physics

7 pages, 4 figures, submitted to Laser Physics, Special issue in honour of the 70th birthday of Herbert Walther

Scientific paper

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.

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