Abstract

We report on the generation of a type-I multimode two-photon state on a rubidium ${\mathit{D}}_2$ line $\left(780\mathrm{nm}\right)$ using periodically poled $\mathrm{K}\mathrm{Ti}\mathrm{O}\mathrm{P}{\mathrm{O}}_4$ 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 $7.8\mathrm{MHz}$. We also use a Fabry–Perot 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 narrow-band photons in Rb atomic ensembles, which is important for long-distance quantum communication.

© 2008 Optical Society of America

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