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Presentation 2018-06-05 15:00
Optimal conditions for Bell test using a spontaneous parametric down-conversion source
Yoshiaki Tsujimoto, Kentaro Wakui, Mikio Fujiwara, Kazuhiro Hayasaka, Shigehito Miki, Hirotaka Terai, Masahide Sasaki, Masahiro Takeoka (NICT)
Abstract (in Japanese) (See Japanese page) 
(in English) Loophole-free violation of the Bell inequality
is not only one of the most striking features of quantum mechanics,
but also consists the basis of
the unconditional security of device-independent quantum key distribution.
In this study, we theoretically and experimentally investigate the optimal conditions for
the Bell experiment using spontaneous parametric down conversion~(SPDC) sources.
It is theoretically revealed that setting the large average photon number~(around 1.0) is desirable for observing the
large violation of the Clauser-Horne-Shimony-Holt~(CHSH) inequality. In the experiment,
we performed the Bell experiment without postselection
using polarization entangled photon pairs generated by SPDC.
While the detection efficiencies of our system is too low to directly observe the CHSH violation,
we see that our theoretical values well agree with the experimental values. Furthermore,
by compensating the imperfect detection efficiencies using
the global optimization, we
confirmed that setting the large average photon number indeed lead to the large CHSH violation.
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Conference Information
Committee QIT  
Conference Date 2018-06-04 - 2018-06-05 
Place (in Japanese) (See Japanese page) 
Place (in English) ICCH Ran 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Quantum Information 
Paper Information
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Conference Code 2018-06-QIT 
Language English 
Title (in Japanese) (See Japanese page) 
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Title (in English) Optimal conditions for Bell test using a spontaneous parametric down-conversion source 
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1st Author's Name Yoshiaki Tsujimoto  
1st Author's Affiliation National Institute of Information and Communications Technology (NICT)
2nd Author's Name Kentaro Wakui  
2nd Author's Affiliation National Institute of Information and Communications Technology (NICT)
3rd Author's Name Mikio Fujiwara  
3rd Author's Affiliation National Institute of Information and Communications Technology (NICT)
4th Author's Name Kazuhiro Hayasaka  
4th Author's Affiliation National Institute of Information and Communications Technology (NICT)
5th Author's Name Shigehito Miki  
5th Author's Affiliation National Institute of Information and Communications Technology (NICT)
6th Author's Name Hirotaka Terai  
6th Author's Affiliation National Institute of Information and Communications Technology (NICT)
7th Author's Name Masahide Sasaki  
7th Author's Affiliation National Institute of Information and Communications Technology (NICT)
8th Author's Name Masahiro Takeoka  
8th Author's Affiliation National Institute of Information and Communications Technology (NICT)
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Speaker Author-1 
Date Time 2018-06-05 15:00:00 
Presentation Time 20 minutes 
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