Violation of Bell’s Inequality in 1550 nm Band without Subtraction of Accidental Coincidences
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概要
- 論文の詳細を見る
A violation of Bell’s inequalities using quantum entanglement indicates the nonlocality of two particles such as photons and electrons. We observe a violation of the Clauser-Horne-Shimony-Holt (CHSH) inequality, a particular Bell’s inequality, in polarization-entangled photon pairs in the 1550 nm band. For photon pair generation based on spontaneous parametric down conversion, a fiber-optic two-photon interferometer with two periodically poled lithium niobate waveguides is adopted. The obtained $S$ value of the CHSH inequality is $2.44 \pm 0.02$ without subtraction of accidental coincidences, yielding a violation by ${\sim}22$ standard deviations in an hour. Two-photon interference with a visibility of 0.885 is also observed. If those coincidences are subtracted, the visibility becomes almost unity.
- Japan Society of Applied Physicsの論文
- 2005-03-10
著者
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Yoshizawa Akio
National Inst. Of Advanced Industrial Sci. And Technol. (aist) Ibaraki Jpn
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Tsuchida Hidemi
National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba 305-
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Tsuchida Hidemi
National Inst. Of Advanced Industrial Sci. And Technol. (aist) Ibaraki Jpn
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