N-fold parallel repetition of routed Bell tests lowers the detection-efficiency threshold for certifying non-jointly-measurable measurements on the distant device to eta*=1/2^N, matching the tight lower bound.
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Extending quantum correlations to arbitrary distances via parallel repetition of routed Bell tests
N-fold parallel repetition of routed Bell tests lowers the detection-efficiency threshold for certifying non-jointly-measurable measurements on the distant device to eta*=1/2^N, matching the tight lower bound.