Robust quantum gates on neutral atoms with cavity-assisted photon scattering

Creators: Duan, L.-M.; Wang, B.; Kimble, H. J.

Abstract

We propose a scheme to achieve quantum computation with neutral atoms whose interactions are catalyzed by single photons. Conditional quantum gates, including an N-atom Toffoli gate and nonlocal gates on remote atoms, are obtained through cavity-assisted photon scattering in a manner that is robust to random variation in the atom-photon coupling rate and which does not require localization in the Lamb-Dicke regime. The dominant noise in our scheme is automatically detected for each gate operation, leading to signalled errors which do not preclude efficient quantum computation even if the error probability is close to the unity.

Additional Information

© 2005 The American Physical Society. (Received 6 July 2005; published 28 September 2005) Note added. After submission of this work, we were informed that a similar idea was also investigated by the authors X.-M. Lin et al. (unpublished). We gratefully acknowledge the contributions of W. D. Phillips, whose question stimulated these investigations. We thank also S. Lloyd for helpful discussions. This work was supported by the National Science Foundation (Grant Nos. 0431476, EIA-0086038, and PHY-0140355), the Advanced Research and Development Activity under ARO contracts, the A. P. Sloan foundation (L.M.D.), and the Caltech MURI Center for Quantum Networks (H.J.K.).

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