Loophole-Free Bell Test Based on Local Precertification of Photon's Presence

Adán Cabello, Fabio Sciarrino
2012 Physical Review X  
A loophole-free violation of Bell inequalities is of fundamental importance for demonstrating quantum nonlocality and long-distance device-independent secure communication. However, transmission losses represent a fundamental limitation for photonic loophole-free Bell tests. A local precertification of the presence of the photons immediately before the local measurements may solve this problem. We show that local precertification is feasible by integrating three current technologies: (i)
more » ... ologies: (i) enhanced single-photon down-conversion to locally create a flag photon, (ii) nanowire-based superconducting single-photon detectors for a fast flag detection, and (iii) superconducting transition-edge sensors to close the detection loophole. We carry out a precise space-time analysis of the proposed scheme, showing its viability and feasibility.
doi:10.1103/physrevx.2.021010 fatcat:b46wfwa7drfq5lhrb7ycpcfroa