Selective Atom-Cavity Interaction Scheme for Quantum Controlled-NOT Gate Using Four-Level Atoms in Cavity QED System

We propose a scheme for realization a quantum Controlled-NOT gate operation using two four-level atomsthrough a selective atom-cavity interaction in cavity quantum electrodynamics system.In our protocol,the quantuminformation is encoded on the stable ground states of the two atoms.During the interaction between atoms and singlemodevacuum cavity-field,the atomic spontaneous emission is negligible as the large atom-cavity detuning effectivelysuppresses the spontaneous decay of the atoms.The influences of the dissipation and the deviation of interaction timeon fidelity and corresponding success probability of the quantum Controlled-NOT gate and the experimental feasibilityof our proposal are also discussed.