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Proceedings Paper

Bell inequality experiment for a high brightness time-energy entangled source
Author(s): Ian R. Nemitz; Jonathan Dietz; Evan J. Katz; Brian Vynhalek; Benjamin Child; Bertram M. Floyd; John D. Lekki
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Paper Abstract

A periodically poled MgO – doped LiNbO3 (MgO:LN) non-degenerate photon pair source is utilized for spontaneous parametric down-conversion of 532 nm photons into time-energy entangled pairs of 794 and 1614 nm photons. The entangled photons are separated using previously detailed sorting optics, such that each wavelength is independently directed through one of two modified Mach-Zehnder interferometers – also known as a Franson interferometer – after which they are fiber-optically guided to high-efficiency photon detectors. Output from the detectors is sent to a high resolution time tagger, where coincidences between the entangled photons are recorded. By varying the length of the long path in one Mach-Zehnder interferometer, it is possible to observe high visibility sinusoidal fringes in the measured coincidence rates (while no variation is seen in single photon detection rates). These fringes – due to interference between the photon probability amplitudes – are indicative of a violation of the Bell inequality, and confirm inconsistencies with local hidden variable theory for the correlations of the time-energy entangled photon pairs.

Paper Details

Date Published: 4 March 2019
PDF: 7 pages
Proc. SPIE 10902, Nonlinear Frequency Generation and Conversion: Materials and Devices XVIII, 109021U (4 March 2019);
Show Author Affiliations
Ian R. Nemitz, NASA Glenn Research Ctr. (United States)
Jonathan Dietz, Harvard Univ. (United States)
Evan J. Katz, NASA Glenn Research Ctr. (United States)
Brian Vynhalek, NASA Glenn Research Ctr. (United States)
Benjamin Child, Worcester Polytechnic Institute (United States)
Bertram M. Floyd, Sierra Lobo, Inc. (United States)
John D. Lekki, NASA Glenn Research Ctr. (United States)


Published in SPIE Proceedings Vol. 10902:
Nonlinear Frequency Generation and Conversion: Materials and Devices XVIII
Peter G. Schunemann; Kenneth L. Schepler, Editor(s)

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