We consider a Bell-like inequality performed using various instances ofmulti-photon entangled states to demonstrate that losses occurring after theunitary transformations used in the nonlocality test can be counteracted byenhancing the "size" of such entangled states. In turn, this feature can beused to overcome detection inefficiencies affecting the test itself: a slightincrease in the size of such states, pushing them towards a more "macroscopic"form of entanglement, significantly improves the state robustness againstdetection inefficiency, thus easing the closing of the detection loophole.Differently, losses before the unitary transformations cause decoherenceeffects that cannot be compensated using macroscroscopic entanglement.
展开▼
