Joint spectral intensity of entangled photon pairs from a warm atomic ensemble via stimulated emission beat interferometry

Photonic quantum states generated from atomic systems play prominent roles in long-distance quantum networks and scalable quantum communication, because entangled photon pairs from atomic ensembles possess a universal identity and narrow spectral bandwidth for quantum repeaters. In this study, we pr...

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Bibliographic Details
Published in:Optics letters 2020-05, Vol.45 (9), p.2668-2671
Main Authors: Jeong, Taek, Moon, Han Seb
Format: Article
Language:English
Subjects:
Atomic structure
Bandwidths
Continuous radiation
Emission
Interferometry
Narrowband
Optical frequency
Photons
Repeaters
Signal to noise ratio
Spectra
Stimulated emission
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Summary:Photonic quantum states generated from atomic systems play prominent roles in long-distance quantum networks and scalable quantum communication, because entangled photon pairs from atomic ensembles possess a universal identity and narrow spectral bandwidth for quantum repeaters. In this study, we propose and demonstrate a novel, to the best of our knowledge, method for the joint spectral intensity measurement of narrowband continuous wave (CW)-mode photon pairs from a warm atomic ensemble using stimulated emission and beat interferometry for the first time. Our approach offers the advantage of sub-megahertz resolution, absolute optical frequency measurements with megahertz-level accuracy, fast collection time, and high signal-to-noise ratio; thus, our method can find important applications in the characterization of narrowband photon pairs generated from sources including atoms and artificially structured material.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.391239