Please use this identifier to cite or link to this item: https://doi.org/10.1038/s41598-020-70045-7
Title: Bright-light detector control emulates the local bounds of Bell-type inequalities
Authors: Sajeed, S.
Sultana, N.
Lim, Charles Ci Wen 
Makarov, V.
Issue Date: 2020
Publisher: Nature Research
Citation: Sajeed, S., Sultana, N., Lim, Charles Ci Wen, Makarov, V. (2020). Bright-light detector control emulates the local bounds of Bell-type inequalities. Scientific Reports 10 (1) : 13205. ScholarBank@NUS Repository. https://doi.org/10.1038/s41598-020-70045-7
Rights: Attribution 4.0 International
Abstract: It is well-known that no local model—in theory—can simulate the outcome statistics of a Bell-type experiment as long as the detection efficiency is higher than a threshold value. For the Clauser–Horne–Shimony–Holt (CHSH) Bell inequality this theoretical threshold value is ?T=2(2-1)?0.8284. On the other hand, Phys. Rev. Lett. 107, 170404 (2011) outlined an explicit practical model that can fake the CHSH inequality for a detection efficiency of up to 0.5. In this work, we close this gap. More specifically, we propose a method to emulate a Bell inequality at the threshold detection efficiency using existing optical detector control techniques. For a Clauser–Horne–Shimony–Holt inequality, it emulates the CHSH violation predicted by quantum mechanics up to ?T. For the Garg–Mermin inequality—re-calibrated by incorporating non-detection events—our method emulates its exact local bound at any efficiency above the threshold. This confirms that attacks on secure quantum communication protocols based on Bell violation is a real threat if the detection efficiency loophole is not closed. © 2020, The Author(s).
Source Title: Scientific Reports
URI: https://scholarbank.nus.edu.sg/handle/10635/199534
ISSN: 2045-2322
DOI: 10.1038/s41598-020-70045-7
Rights: Attribution 4.0 International
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