Bell Experiments with Random Destination Sources

Abstract

It is generally assumed that sources sending randomly two particles to one or two different observers, named here random destination sources (RDS), cannot by used for genuine quantum nonlocality tests because of the postselection loophole. We demonstrate that Bell experiments not affected by the postselection loophole may be performed with: (i) RDS and local postselection using perfect detectors, (ii) RDS, local postselection, and fair sampling assumption with any detection efficiency, and (iii) RDS and a threshold detection efficiency required to avoid the detection loophole. These results allow the adoption of RDS setups, which are more simple and efficient, for long-distance free-space Bell tests, and extends the range of physical systems which can be used for loophole-free Bell tests.

rexTex4, 4 pages, revised version

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• $N$ identical particles and one particle to entangle them all
• Loophole-free Bell test based on local precertification of photon's presence
• Genuine multipartite nonlocality with causal-diagram postselection
• Bounding the detection efficiency threshold in Bell tests using multiple copies of the maximally entangled two-qubit state carried by a single pair of particles
• Coincidence postselection for genuine multipartite nonlocality: Causal diagrams and threshold efficiencies
• Extending the fair sampling assumption using causal diagrams
• Frequency and phase relations of entangled photons observed by a two-photon interference experiment
• On safe post-selection for Bell tests with ideal detectors: Causal diagram approach