The Essence of More Nonlocality with Less Entanglement in Bell Tests |
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Authors: | TAN Yong-Gang LIU Qiang HU Yao-Hua LU Hua |
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Institution: | 1. Physics and Information Engineering Department, Luoyang Normal College, Luoyang 471022, China;
2. Department of Mathematics and Physics, Hubei University of Technology, Wuhan 430068, China |
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Abstract: | In this paper,we will explore the essence of the phenomenon that state with less entanglement may generate greater Bell violation in the two-qubit Bell tests with CH-type inequalities,i.e.,more nonlocality with less entanglement.We will show that this interesting but counterintuitive phenomenon is caused by the rotational asymmetry of the nonmaximally entangled state in the measurement plane.This asymmetry allows the both-side detection probabilities and the one-side detection probabilities obtain their maximal values with nonmaximally entangled state.But the maximal Bell violation may not always happen on nonmaximally entangled state,because these probabilities will compete with each other,and the Bell violation behaves diferently for various CH-type inequalities. |
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Keywords: | entanglement nonlocality Bell theorem |
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