Interference of an entangled two-photon state by use of two Michelson interferometers and a 50-picosecond coincidence time window
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Sergienko, A. V., Y. H. Shih, and M. H. Rubin. “Interference of an Entangled Two-Photon State by Use of Two Michelson Interferometers and a 50-Picosecond Coincidence Time Window.” Quantum Electronics and Laser Science Conference (1992), Paper QTuM5, Optica Publishing Group, May 10, 1992, QTuM5. https://opg.optica.org/abstract.cfm?uri=QELS-1992-QTuM5.
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Abstract
An Einstein-Podolsky-Rosen (EPR) experiment by means of second-order interference of a two-photon entangled state was studied for the first time with a 50-ps coincidence time window. Franson proposed a new type of EPR experiment¹ for measurement of position and time correlation in contrast to the historical measurement of polarization correlation²⁻⁴ and to study Bell's inequality. This effect arises from the existence of two-photon entangled states.⁵ A spontaneous parametric downconversion process creates a two-photon state that is highly correlated in frequency and time regardless of the distance between the photon pair after they leave the nonlinear crystal.