An experimental setup to generate narrowband bi-photons via four-wave mixing in cold atoms
DOI:
https://doi.org/10.31349/RevMexFis.68.031303Keywords:
cold atoms, bi-photons, quantum optics, complete quantum systems, four-wave mixingAbstract
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.
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Copyright (c) 2022 N. Arias-Tellez, I. F. Angeles-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. Ceré, Daniel Sahagún Sánchez
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