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Bell Inequality Experiment for a High Brightness Time-Energy Entangled SourceA 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 800 and 1600 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.

Document ID
Acquisition Source
Glenn Research Center
Document Type
Nemitz, Ian R.
(NASA Glenn Research Center Cleveland, OH, United States)
Dietz, Jonathan
(Harvard Univ. Cambridge, MA, United States)
Katz, Evan J.
(NASA Glenn Research Center Cleveland, OH, United States)
Vyhnalek, Brian E.
(NASA Glenn Research Center Cleveland, OH, United States)
Child, Benjamin
(Worcester Polytechnic Institute Worcester, MA, United States)
Floyd, Bertram
(HX5 Sierra, LLC Cleveland, OH, United States)
Lekki, John D.
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
May 15, 2019
Publication Date
February 2, 2019
Subject Category
Physics (General)
Report/Patent Number
Meeting Information
Meeting: SPIE Photonics West
Location: San Francisco, CA
Country: United States
Start Date: February 2, 2019
End Date: February 7, 2019
Sponsors: International Society for Optical Engineering
Funding Number(s)
WBS: 553323.
Distribution Limits
Public Use Permitted.
time-energy entanglement
Franson interferometer
spontaneous parametric down conversion
bell inequality
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