High purity bright single photon source

Details High purity bright single photon source High purity bright single photon source

2007-04-14

arxiv.org/abs/0704.1864v2

Opt. Express 15, 7940-7949 (2007)

Physics

Quantum Physics

9 pages, 4 figures; minor changes, added reference

Scientific paper

10.1364/OE.15.007940

Using cavity-enhanced non-degenerate parametric downconversion, we have built a frequency tunable source of heralded single photons with a narrow bandwidth of 8 MHz, making it compatible with atomic quantum memories. The photon state is 70% pure single photon as characterized by a tomographic measurement and reconstruction of the quantum state, revealing a clearly negative Wigner function. Furthermore, it has a spectral brightness of ~1,500 photons/s per MHz bandwidth, making it one of the brightest single photon sources available. We also investigate the correlation function of the down-converted fields using a combination of two very distinct detection methods; photon counting and homodyne measurement.

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