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

Abstract

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$\acute{\mathrm{e}}$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.

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

References in corpus (6)

• Experimental quantum teleportation
• Generation of Nonclassical Photon Pairs for Scalable Quantum Communication with Atomic Ensembles
• Measurement-Induced Entanglement for Excitation Stored in Remote Atomic Ensembles
• Experimental realization of Wheeler's delayed-choice GedankenExperiment
• Time-bin modulated polarization-entangled biphotons from cavity-enhanced down-conversion
• Observation of an oscillatory correlation function of multimode two-photon pairs

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• A versatile design for resonant guided-wave parametric down-conversion sources for quantum repeaters
• Time-resolved certification of frequency-bin entanglement over multi-mode channels
• Enhancing entanglement detection of quantum optical frequency combs via stimulated emission