We show how realistic cavity-assisted interaction between neutral atoms and coherent optical pulses, and measurement techniques, combined with optical transportation of atoms, allow for a universal set of quantum gates acting on decoherence-free subspace in a deterministic way. The logical qubits are immunized to the dominant source of decoherece—dephasing, while the influences of additional errors are shown by numerical simulations. We analyze the performance and stability of all required operations and emphasize that all techniques are feasible with current experimental technology.

• Received 5 January 2006

DOI:https://doi.org/10.1103/PhysRevLett.97.140501