Penalized N-product Bell inequalities allow the critical detection efficiency for any original Bell inequality to decay exponentially with N by parallelizing N tests across orthogonal subspaces.
Branciard, Phys
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Exponentially decreasing critical detection efficiency for any Bell inequality
Penalized N-product Bell inequalities allow the critical detection efficiency for any original Bell inequality to decay exponentially with N by parallelizing N tests across orthogonal subspaces.