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Quantum logic operations can be implemented using nonlinear phase shifts (theKerr effect) or the quantum Zeno effect based on strong two-photon absorption.Both approaches utilize three-level atoms, where the upper level is tuned onresonance for the Zeno gates and off-resonance for the nonlinear phase gates.The performance of nonlinear phase gates and Zeno gates are compared underconditions where the parameters of the resonant cavities and three-level atomsare the same in both cases. It is found that the expected performance iscomparable for the two approaches, despite the apparent differences in the waythey are implemented.

Theoretical comparison of quantum Zeno gates and nonlinear phase gates