Observation of time correlation function of multimode two-photon pairs on a rubidium D$_2$ line

Details Observation of time correlation function of multimode two-photon pairs on a rubidium D$_2$ line Observation of time correlation function of multimode two-photon pairs on a rubidium D$_2$ line

2008-06-26

arxiv.org/abs/0806.4254v1

Physics

Quantum Physics

4 pages, 3 figures, submitted for publication on 29 April 2008

Scientific paper

10.1364/OL.33.002191

We report the generation of a type-I multimode two-photon state on a rubidium D$_2$ line (780 nm) using periodically poled KTiOPO$_4$ crystals. With a degenerate optical parametric oscillator far below threshold, we observe an oscillatory correlation function, the cross-correlation between two photons shows a cavity bandwidth of about 7.8 MHz. We also use a Fabry-P$\acute{\rm{e}}$rot etalon to filter its most longitudinal modes and observe its time correlation function. The experimental data are well fitted to theoretical curves. This system could be utilized for demonstrating storage and retrieval of narrowband photons in Rb atomic ensembles, which is important for long-distance quantum communication.

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