Sagnac-type entangled photon source using only conventional polarization optics

• URL: http://arxiv.org/abs/2007.05095v1
• Date: Thu, 9 Jul 2020 22:13:30 GMT
• Title: Sagnac-type entangled photon source using only conventional polarization optics
• Authors: Youn Seok Lee (1), Mengyu Xie (1 and 2), Ramy Tannous (1) and Thomas Jennewein (1) ((1) Institute for quantum computing, University of Waterloo, (2) State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University)
• Abstract summary: We demonstrate the pulsed generation of polarization-entangled photon-pairs at wavelengths of 764nm and 1221nm via type-I spontaneous four-wave mixing in a polarization-maintaining fiber. The long-term phase-stability was characterized by an Allan deviation of 8$circ$ over an integration time of about 1 hour with no active phase-stabilization.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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 764nm and 1221nm 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 $S=2.70\pm0.04$. The long-term phase-stability was characterized by an Allan deviation of 8$^\circ$ over an integration time of about 1 hour with no active phase-stabilization.

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