Significant-Loophole-Free Test of Bells Theorem with Entangled Photons
2015 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 115, no 25, 250401- p.Article in journal (Refereed) PublishedText
Local realism is the worldview in which physical properties of objects exist independently of measurement and where physical influences cannot travel faster than the speed of light. Bells theorem states that this worldview is incompatible with the predictions of quantum mechanics, as is expressed in Bells inequalities. Previous experiments convincingly supported the quantum predictions. Yet, every experiment requires assumptions that provide loopholes for a local realist explanation. Here, we report a Bell test that closes the most significant of these loopholes simultaneously. Using a well-optimized source of entangled photons, rapid setting generation, and highly efficient superconducting detectors, we observe a violation of a Bell inequality with high statistical significance. The purely statistical probability of our results to occur under local realism does not exceed 3.74 x 10(-31), corresponding to an 11.5 standard deviation effect.
Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2015. Vol. 115, no 25, 250401- p.
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:liu:diva-123747DOI: 10.1103/PhysRevLett.115.250401ISI: 000366486600001PubMedID: 26722905OAI: oai:DiVA.org:liu-123747DiVA: diva2:892984
Funding Agencies|program CoQuS of the FWF (Austrian Science Fund); EU Integrated Project SIQS; European Union Project QUIC ; Spanish MINECO under the Severo Ochoa programme [SEV-2015-0522]; Project MAGO [FIS2011-23520]; Project EPEC [FIS2014-62181-EXP]; Catalan AGAUR SGR Grants [129, 1623]; European Regional Development Fund (FEDER) Grant [TEC2013-46168-R]; Fundacio Privada CELLEX; NIST Quantum Information Science Initiative; Austrian Academy of Sciences (OAW); European Research Council (SIQS) [600645 EU-FP7-ICT]; Austrian Science Fund (FWF) [SFB F40]; European Research Council Project AQUMET2016-01-112016-01-112016-08-31