Closing the detection loophole in Bell experiments using qudits

Details Closing the detection loophole in Bell experiments using qudits Closing the detection loophole in Bell experiments using qudits

2009-09-17

arxiv.org/abs/0909.3171v2

Phys. Rev. Lett. 104, 060401 (2010)

Physics

Quantum Physics

7 pages, 4 figures. v2: improved experimental scheme

Scientific paper

10.1103/PhysRevLett.104.060401

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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