Phys. Rev. Lett. 95, 133601 (2005) [4 pages]On-Demand Superradiant Conversion of Atomic Spin Gratings into Single Photons with High EfficiencyReceived 19 April 2005; published 20 September 2005 We create quantized spin gratings by single-photon detection and convert them on demand into photons with retrieval efficiencies exceeding 40% (80%) for single (a few) quanta. We show that the collective conversion process, proceeding via superradiant emission into a moderate-finesse optical resonator, requires phase matching. The storage time of 3 μs in the cold-atom sample, as well as the peak retrieval efficiency, are likely limited by Doppler decoherence of the entangled state. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.133601
DOI:
10.1103/PhysRevLett.95.133601
PACS:
42.50.Dv, 03.67.Hk, 42.50.Gy
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