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We evaluate the advantages of performing cross-phase modulation (XPM) on a very-far-off-resonance atomic system. We consider a ladder system with a weak (few-photon level) control coherent field imparting a conditional nonlinear phase shift on a probe beam. We find that by coupling to an optical resonator, the optimal XPM is enhanced proportional to the finesse of the resonator by a factor of ��/4��. We present a semiclassical description of the system and show that the phenomenon is optimal in the self-defined condition of off-resonance effective cooperativity equal to one.


This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Journal of the Optical Society of America B, volume 33, issue 6, in 2016 following peer review. This article may not exactly replicate the final published version. The definitive publisher-authenticated version is available online at

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