Closing the Detection Loophole in Bell Experiments Using Qudits

Tamas Vertesi*, Stefano Pironio, Nicolas Brunner

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

193 Citations (Scopus)


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.

Original languageEnglish
Article number060401
Number of pages4
JournalPhysical Review Letters
Issue number6
Publication statusPublished - 12 Feb 2010




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