Closing the detection loophole in multipartite Bell tests using Greenberger-Horne-Zeilinger states

Karoly F. Pal*, Tamas Vertesi, Nicolas Brunner

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

9 Citations (Scopus)


We investigate the problem of closing the detection loophole in multipartite Bell tests, and show that the required detection efficiencies can be significantly lowered compared to the bipartite case. In particular, we present Bell tests based on n-qubit Greenberger-Horne-Zeilinger states, which can tolerate efficiencies as low as 38% for a reasonable number of parties and measurements. Even in the presence of a significant amount of noise, efficiencies below 50% can be tolerated, which is encouraging given recent experimental progress. Finally, we give strong evidence that, for a sufficiently large number of parties and measurements, arbitrarily small efficiencies can be tolerated, even in the presence of an arbitrary large amount of noise.

Original languageEnglish
Article number062111
Number of pages5
JournalPhysical Review A: Atomic, Molecular and Optical Physics
Issue number6
Publication statusPublished - 19 Dec 2012




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