Friday, July 12, 2013

1307.2933 (N. Aharon et al.)

Construction of a protected qubit subspace within a half integer total
angular momentum system

N. Aharon, M. Drewsen, A. Retzker
We present a new robust decoupling scheme suitable for half integer angular momentum states. The scheme is based on continuous dynamical decoupling techniques by which we create a protected qubit subspace. Our scheme predicts a coherence time of ~1 second, as compared to typically a few milliseconds for the bare states. We show how single qubit gates and an ensemble coupling to a cavity mode can be implemented efficiently. Our scheme can be realized with state-of-the-art experimental setups and thus has immediate applications for quantum information science, and in particular for systems of rare-earth ions in crystals, and trapped alkaline earth ions.
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