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Closing the detection loophole in Bell experiments using qudits · Around

2009

Closing the detection loophole in Bell experiments using qudits

Vertesi, Tamas, Pironio, Stefano, Brunner, Nicolas

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We show that the detection efficiencies required for closing the detection loophole in Bell tests can be significantly lowered using quantum systems of dimension larger than two.

We introduce a series of asymmetric Bell tests for which an efficiency arbitrarily close to 1/N can be tolerated using N-dimensional systems, and a symmetric Bell test for which the efficiency can be lowered down to 61.8% using four-dimensional systems.
Experimental perspectives for our schemes look promising considering recent progress in atom-photon entanglement and in photon hyperentanglement.

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