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

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

2000-12-15

arxiv.org/abs/quant-ph/0012073v2

Physics

Quantum Physics

10 pages, 5 figures, REVTeX, to appear in Phys. Rev. A (v2 - minor changes in discussion of experimental conditions)

Scientific paper

10.1103/PhysRevA.64.023805

We propose an optical double-cavity resonator whose response to a signal is similar to that of an Electromagnetically Induced Transparency (EIT) medium. A combination of such a device with a four-level EIT medium can serve for achieving large cross-Kerr modulation of a probe field by a signal field. This would offer the possibility of building a quantum logic gate based on photonic qubits. We discuss the technical requirements that are necessary for realizing a probe-photon phase shift of Pi caused by a single-photon signal. The main difficulty is the requirement of an ultra-low reflectivity beamsplitter and to operate a sufficiently dense cool EIT medium in a cavity.

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