| 講演抄録／キーワード |
| 講演名 |
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） |
| 抄録 |
（和） |
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. |
| （英） |
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. |
| キーワード |
（和） |
Quantum communication / Quantum optics / Bell's inequality / / / / / |
| （英） |
/ / / / / / / |
| 文献情報 |
信学技報 |
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