On-off detection needs only 82.58% overall efficiency for a loophole-free Bell violation with a path-entangled single photon, and the practical bottleneck is spectral mode overlap rather than efficiency.
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Bell violation with path-entangled number states under realistic detection
On-off detection needs only 82.58% overall efficiency for a loophole-free Bell violation with a path-entangled single photon, and the practical bottleneck is spectral mode overlap rather than efficiency.