Pulsed Sagnac source of polarization-entangled photon pairs in telecommunication band

We report a source of polarization-entangled photon pairs in the 1550-nm telecommunication band, which is based on non-collinear spontaneous parametric down-conversion in a periodically poled lithium niobate crystal pumped by picosecond pulses. This source is realized utilizing a polarization-based...

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Bibliographic Details
Published in:Scientific reports 2019-03, Vol.9 (1), p.5031-5031, Article 5031
Main Authors: Kim, Heonoh, Kwon, Osung, Moon, Han Seb
Format: Article
Language:English
Subjects:
639/624/400/3925
639/624/400/482
Bandwidths
Efficiency
Humanities and Social Sciences
Lithium
multidisciplinary
Polarization
Science
Science (multidisciplinary)
Sensors
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Summary:We report a source of polarization-entangled photon pairs in the 1550-nm telecommunication band, which is based on non-collinear spontaneous parametric down-conversion in a periodically poled lithium niobate crystal pumped by picosecond pulses. This source is realized utilizing a polarization-based Sagnac interferometer employing a type-0 non-collinear quasi-phase-matching configuration. Polarization entanglement is verified through measurement of the polarization-correlation interference fringes with visibility >96% and by testing the experimental violation of the Clauser-Horne-Shimony-Holt (CHSH) form of Bell’s inequality. The CHSH-Bell parameter S is found to be 2.72 ± 0.04, with 18 standard deviations from the statistical uncertainty.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-019-41633-z