Closing the detection loophole in multipartite Bell experiments with a limited number of efficient detectors

Kamil Kostrzewa , Wiesław Laskowski , Tamás Vértesi


The problem of closing the detection loophole in Bell tests is investigated in the presence of a limited number of efficient detectors using emblematic multipartite quantum states. To this end, a family of multipartite Bell inequal- ities is introduced based on local projective measurements conducted by N − k parties and applying a k-party Bell inequality on the remaining parties. Surprisingly, we find that most of the studied pure multipartite states involving, e.g., cluster states, the Dicke states, and the Greenberger-Horne-Zeilinger states can violate our inequalities with only the use of two efficient detectors, whereas the remaining detectors may have arbitrary small efficiencies. We believe that our inequalities are useful in Bell experiments and device-independent applications if only a small number of highly efficient detectors are at our disposal or our physical system is asymmetric, e.g., atom-photon.
Author Kamil Kostrzewa (FMPI / ITPA)
Kamil Kostrzewa,,
- Institute of Theoretical Physics and Astrophysics
, Wiesław Laskowski (FMPI / ITPA)
Wiesław Laskowski,,
- Institute of Theoretical Physics and Astrophysics
, Tamás Vértesi
Tamás Vértesi,,
Journal seriesPhysical Review A, ISSN 1050-2947, (A 35 pkt)
Issue year2018
Publication size in sheets0.5
Languageen angielski
Score (nominal)35
ScoreMinisterial score = 35.0, 24-10-2018, ArticleFromJournal
Ministerial score (2013-2016) = 35.0, 24-10-2018, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 2.925 (2) - 2016=2.716 (5)
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