Open AccessTwo-photon interferences of nondegenerate photon pairs from Doppler-broadened atomic ensemble
Author(s) -
Jiho Park,
Heonoh Kim,
Han Seb Moon
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.032064
Subject(s) - physics , photon , interferometry , superposition principle , coherence (philosophical gambling strategy) , doppler effect , interference (communication) , optics , michelson interferometer , photon polarization , phase (matter) , polarization (electrochemistry) , coherent states , path length , quantum mechanics , quantum , channel (broadcasting) , chemistry , electrical engineering , engineering
We report two-photon interference experiments performed with correlated photon pairs generated via spontaneous four-wave mixing in a Doppler-broadened atomic ensemble involving the 5S 1/2 -5P 3/2 -5D 5/2 transition of 87 Rb atoms. When two photons with different wavelengths are incident on a polarization-based Michelson interferometer, two kinds of two-photon superposition states, the frequency-entangled state and dichromatic path-entangled state depending on whether the two photons are in different paths or in the same path, are probabilistically generated within the interferometer arms. Hong-Ou-Mandel-type interference fringes resulting from the frequency-entangled state are observed over the range of the single-photon coherence length, following introduction of a coarse path-length difference between the two interferometer arms and employing phase randomization. When the interferometer is highly phase-sensitive without phase randomization, a phase super-resolved fringe arising from the dichromatic path-entangled state is observed, both with and without the accompanying one-photon interference fringes.