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An experimental setup to generate narrowband bi-photons via four-wave mixing in cold atoms

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posted on 2023-06-08, 12:47 authored by N. Arias-Téllez, I. F. Ángeles-Aguillón, D. Martínez-Cara, A. Martínez-Vallejo, L. Y. Villegas-Aguilar, L. A. Mendoza-López, Y. M. Torres, R. A. Gutiérrez-Arenas, R. Jáuregui, I. Pérez Castillo, A. Cerè, D. Sahagún Sánchez
We present our recently-built experimental setup designed to generate near-infrared and narrow-band correlated photon pairs by inducing four-wave mixing in a cold gas of $^{87}$Rb 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 $\times 10^5$ in a Hanbury Brown - Twiss interferometer. A $1/e$ coherence time for the heralded, idler photons of $4.4 \pm 0.1$ ns is estimated from our observations. We are able to achieve a value of $10^{4}$ s$^{-1}$ pair-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.

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