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Improvement of Hong-Ou-Mandel Interference Visibility by Using a Single-Mode Optical-Fiber Photon Collector
New Phys.: Sae Mulli 2018; 68: 1374~1377
Published online December 31, 2018;
© 2018 New Physics: Sae Mulli.

Sung-Wook HAN1, Heonoh KIM2, Joo Yeon SEO3, Kim MYUNG-WHUN*1,3

1 Department of Physics, Chonbuk National University, Jeonju 54896, Korea
2 Department of Physics, Busan National University, Busan 46241, Korea
3 Institute of Photonics and Information Technology, Chonbuk National University, Jeonju 54896, Korea
Correspondence to:
Received October 2, 2018; Revised October 17, 2018; Accepted October 17, 2018.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
We achieved 95% visibility in the Hong-Ou-Mandel interference experiment while we achieved only 56% visibility in a previous report. We used a 120 mW 405 nm single-mode continuous wave laser, a 5-mm-thick type-1 $\beta$-barium borate single crystal, standard Hong-Ou-Mandel interferometer optics, two avalanche photodiode single-photon counters, and a homemade coincidence counting unit. The photon collection unit was the key difference between the present study and the previous study. In the present experiment, we used single-mode optical fibers for photon collection, which suppressed accidental coincidence between-different mode photons by acting as a spatial filter because of its core size being much smaller than a multi-mode fiber.
PACS numbers: 07.60.Ly, 07.50.-e, 42.25.Hz, 42.50.-p, 42.50.Ar
Keywords: Spontaneous parametric down conversion, Hong-Ou-Mandel interferometer, Single-mode laser, Single-mode fiber

April 2019, 69 (4)
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