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Quantum-Atom Optics Downunder (QAO)

Interaction Free Spectroscopy with Single Photons

Alessandro Ceré, Florian Wolfgramm, Marta Abad, Ana Predojević, Zehui Zhai, Morgan W. Mitchell

Published Jan 1, 2007• 0 citations
Publisher

Abstract

We discuss an interaction free measurement of the optical density of a hot sample of 87Rb atoms. This system can be used as narrowband filter for light, with the filtered radiations presenting a spectrum suitable for efficient interaction with an atomic ensemble. This is useful especially together with broadband single photon sources for matching the spectral requirements of interaction with cold atoms ensembles. Experimental progress in the realization of narrowband single photon state will be presented.

DOI
10.1364/qao.2007.qwe21

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We discuss an interaction free measurement of the optical density of a hot sample of 87Rb atoms. This system can be used as narrowband filter for light, with the filtered radiations presenting a spectrum suitable for efficient interaction with an atomic ensemble. This is useful especially together with broadband single photon sources for matching the spectral requirements of interaction with cold atoms ensembles. Experimental progress in the realization of narrowband single photon state will be presented.
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We present our recently-built experimental setup designed to generate near-infrared and narrow-band correlated photon pairs by inducingfour-wave mixing in a cold gas of 87Rb atoms confined in a magneto-optical trap. The experimental setup and its automation and control approach are described in detail. A characterization of the optical density of the atomic ensemble as well as the basic statistical measurements of the generated light are reported. The non-classical nature of the photons pairs is confirmed by observing a violation of Cauchy-Schwarz inequality by a factor of 5.6 × 10 5 in a Hanbury Brown – Twiss interferometer. A 1/e coherence time for the heralded, idler photons of 4.4 ± 0.1 ns is estimated from our observations. We are able to achieve a value of 104 s−1pair-detection-rate, which results in a spectral brightness of 280 (MHz s)−1. The combination of high brightness and narrow-band spectrum makes this photon-pair source a viable tool in fundamental studies of quantum states and opens the door to use them in quantum technologies.
We investigate the temporal and spectral properties of narrowband photon pairs from a double-Λ-type atomic system of a warm 87Rb atomic ensemble. The temporal properties of the narrowband photons are investigated by measuring their auto-correlation and cross-correlation functions. The spectral measurement of the photon pair is obtained by applying the stimulated emission method. We show that the biphoton spectral waveform with a spectral width of ∼6 MHz corresponds to the biphoton temporal waveform with a temporal width of ∼26 ns. We believe that our results can contribute to the characterization of narrowband photons generated from atomic ensembles and aid in the development of new photonic quantum states generated from atomic systems.