Atom-Resonant Heralded Single Photons by Interaction-Free Measurement

Details Atom-Resonant Heralded Single Photons by Interaction-Free Measurement Atom-Resonant Heralded Single Photons by Interaction-Free Measurement

2011-02-02

arxiv.org/abs/1102.0484v1

Phys. Rev. Lett. 106, 053602 (2011)

Physics

Quantum Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.106.053602

We demonstrate the generation of rubidium-resonant heralded single photons for quantum memories. Photon pairs are created by cavity-enhanced down-conversion and narrowed in bandwidth to 7 MHz with a novel atom-based filter operating by "interaction-free measurement" principles. At least 94% of the heralded photons are atom-resonant as demonstrated by a direct absorption measurement with rubidium vapor. A heralded auto-correlation measurement shows $g_c^{(2)}(0)=0.040 \pm 0.012$, i.e., suppression of multi-photon contributions by a factor of 25 relative to a coherent state. The generated heralded photons can readily be used in quantum memories and quantum networks.

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