Guaranteed violation of a Bell inequality without aligned reference frames or calibrated devices

Shadbolt, Peter, Vertesi, Tamas, Liang, Yeong-Cherng, Branciard, Cyril, Brunner, Nicolas and O'Brien, Jeremy L. (2012) Guaranteed violation of a Bell inequality without aligned reference frames or calibrated devices. Scientific Reports, 2 . doi:10.1038/srep00470


Author Shadbolt, Peter
Vertesi, Tamas
Liang, Yeong-Cherng
Branciard, Cyril
Brunner, Nicolas
O'Brien, Jeremy L.
Total Author Count Override 6
Title Guaranteed violation of a Bell inequality without aligned reference frames or calibrated devices
Journal name Scientific Reports   Check publisher's open access policy
ISSN 2045-2322
Publication date 2012-06-25
Sub-type Article (original research)
DOI 10.1038/srep00470
Open Access Status DOI
Volume 2
Total pages 7
Place of publication London, United Kingdom
Publisher Nature Publishing Group
Collection year 2013
Language eng
Abstract Bell tests — the experimental demonstration of a Bell inequality violation — are central to understanding the foundations of quantum mechanics, and are a powerful diagnostic tool for the development of quantum technologies. To date, Bell tests have relied on careful calibration of measurement devices and alignment of a shared reference frame between two parties — both technically demanding tasks. We show that neither of these operations are necessary, violating Bell inequalities (i) with certainty using unaligned, but calibrated, measurement devices, and (ii) with near-certainty using uncalibrated and unaligned devices. We demonstrate generic quantum nonlocality with randomly chosen measurements on a singlet state of two photons, implemented using a reconfigurable integrated optical waveguide circuit. The observed results demonstrate the robustness of our schemes to imperfections and statistical noise. This approach is likely to have important applications both in fundamental science and quantum technologies, including device-independent quantum key distribution.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2013 Collection
 
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