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Multiple choice
To close the detection (fair-sampling) loophole in a CHSH Bell test using a maximally entangled state, the detector efficiency eta must exceed which threshold?
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eta > 2*(sqrt(2) - 1) approximately 0.828
eta > 1/2 = 0.5
eta > 1/sqrt(2) approximately 0.707
eta > 2/3 approximately 0.667, with no dependence on the state used
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