A high-efficiency quantum non-demolition single photon number resolving detector

Abstract

We discuss a novel approach to the problem of creating a photon number resolving detector using the giant Kerr nonlinearities available in electromagnetically induced transparency. Our scheme can implement a photon number quantum non-demolition measurement with high efficiency ($\sim$99%) using less than 1600 atoms embedded in a dielectric waveguide.

4 pages, 4 figures. Significantly revised. More discussion on the potential experimental realisation

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