Quantum Search with Two-atom Collisions in Cavity QED
  We propose a scheme to implement two-qubit Grover's quantum search algorithm using Cavity Quantum Electrodynamics. Circular Rydberg atoms are used as quantum bits (qubits). They interact with the electromagnetic field of a non-resonant cavity . The quantum gate dynamics is provided by a cavity-assisted collision, robust against decoherence processes. We present the detailed procedure and analyze the experimental feasibility. 
F. Yamaguchi, P. Milman, M. Brune, J. M. Raimond, S. Haroche