Sagnac-type entangled photon source using only conventional polarization optics
- 1 April 2021
- journal article
- research article
- Published by IOP Publishing in Quantum Science and Technology
- Vol. 6 (2), 025004
- https://doi.org/10.1088/2058-9565/abd151
Abstract
We designed and implemented a novel combination of a Sagnac-interferometer with a Mach-Zehnder interferometer for a source of polarization-entangled photons. The new versatile configuration does not require multi-wavelength polarization optics, yet it performs with a good polarization quality and phase-stability over a wide wavelength range. We demonstrate the interferometer using only standard commercial optics to experimentally realize the pulsed generation of polarization-entangled photon-pairs at wavelengths of 764 nm and 1221 nm via type-I spontaneous four-wave mixing in a polarization-maintaining fiber. Polarization entanglement was verified by a polarization-correlation measurement with a visibility of 95.5% from raw coincidence counts and the violation of the Clauser-Horne-Shimony-Holt (CHSH) inequality with S = 2.70 +/- 0.04. The long-term phase-stability was characterized by an Allan deviation of 8 degrees over an integration time of about 1 h with no active phase-stabilization.Keywords
Funding Information
- Industry Canada
- Canadian Network for Research and Innovation in Machining Technology, Natural Sciences and Engineering Research Council of Canada (RGPIN-386329-2010)
- Ontario Research Foundation (098 / RE08-051)
- Canada Foundation for Innovation (25403 / 30833)
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