Abstract
We propose a scheme to implement a two-qubit conditional quantum phasegate via a single mode cavity and a cascade four-level atomassisted by a classical laser. The quantum information is encodedon the Fock states of the cavity mode and the two metastable groundstates of the atom. Even under the condition of systematicdissipations, this scheme can also be realized with fidelity of 98.6% and success probability of 0.767.
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