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We propose an optical double-cavity resonator whose response to a signal issimilar to that of an Electromagnetically Induced Transparency (EIT) medium. Acombination of such a device with a four-level EIT medium can serve forachieving large cross-Kerr modulation of a probe field by a signal field. Thiswould offer the possibility of building a quantum logic gate based on photonicqubits. We discuss the technical requirements that are necessary for realizinga probe-photon phase shift of Pi caused by a single-photon signal. The maindifficulty is the requirement of an ultra-low reflectivity beamsplitter and tooperate a sufficiently dense cool EIT medium in a cavity.Comment: 10 pages, 5 figures, REVTeX, to appear in Phys. Rev. A (v2 - minor  changes in discussion of experimental conditions

Coupled cavities for enhancing the cross-phase-modulation in electromagnetically induced transparency