Open AccessActive stabilization of a fiber-optic two-photon interferometer using continuous optical length control
Author(s) -
Seok-Beom Cho,
Heonoh Kim
Publication year - 2016
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.24.010980
Subject(s) - interferometry , optics , interference (communication) , physics , photon , optical path length , path length , optical fiber , coherence (philosophical gambling strategy) , coherence length , quantum optics , optical path , telecommunications , computer science , channel (broadcasting) , quantum mechanics , superconductivity
The practical realization of long-distance entanglement-based quantum communication systems strongly rely on the observation of highly stable quantum interference between correlated single photons. This task must accompany active stabilization of the optical path lengths within the single-photon coherence length. Here, we provide two-step interferometer stabilization methods employing continuous optical length control and experimentally demonstrate two-photon quantum interference using an actively stabilized 6-km-long fiber-optic Hong-Ou-Mandel interferometer. The two-step active control techniques are applied for measuring highly stable two-photon interference fringes by scanning the optical path-length difference. The obtained two-photon interference visibilities with and without accidental subtraction are found to be approximately 90.7% and 65.4%, respectively.