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We propose a new scheme to avoid the declination of the two-photon nonlinearity (TPN) caused by effects of many degrees of freedom. We found two criterions for obtaining the efficient TPN by many three-level atoms in a cavity and estimated the optimized TPN.
Two-photon nonlinearity (TPN) has been investigated in the context of realization of a quantum logic gate, where the cavity QED system has been considered to realize a sufficiently strong TPN.
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