Editing Bell test (section)

=== Rauch et al (2018): measurement settings from distant quasars ===
In 2018, an international team used light from two [[quasar]]s (one whose light was generated approximately eight billion years ago and the other approximately twelve billion years ago) as the basis for their measurement settings.<ref name="Hamish 2018">{{cite news |last1=Johnston |first1=Hamish |title=Cosmic Bell test uses light from ancient quasars |url=https://physicsworld.com/a/cosmic-bell-test-uses-light-from-ancient-quasars/ |access-date=10 January 2021 |publisher=[[Physics World]] |date=21 Aug 2018}}</ref>  This experiment pushed the timeframe for when the settings could have been mutually determined to at least 7.8 billion years in the past, a substantial fraction of the [[superdeterminism|superdeterministic]] limit (that being the [[Big Bang|creation of the universe]] 13.8 billion years ago).<ref>{{Cite journal|title=Cosmic Bell Test Using Random Measurement Settings from High-Redshift Quasars|date=Aug 20, 2018|journal=Physical Review Letters|volume=121|issue=8|pages=080403|doi=10.1103/PhysRevLett.121.080403|pmid=30192604|last1 = Rauch|first1 = Dominik|last2=Handsteiner|first2=Johannes|last3=Hochrainer|first3=Armin|last4=Gallicchio|first4=Jason|last5=Friedman|first5=Andrew S.|last6=Leung|first6=Calvin|last7=Liu|first7=Bo|last8=Bulla|first8=Lukas|last9=Ecker|first9=Sebastian|last10=Steinlechner|first10=Fabian|last11=Ursin|first11=Rupert|last12=Hu|first12=Beili|last13=Leon|first13=David|last14=Benn|first14=Chris|last15=Ghedina|first15=Adriano|last16=Cecconi|first16=Massimo|last17=Guth|first17=Alan H.|last18=Kaiser|first18=David I.|last19=Scheidl|first19=Thomas|last20=Zeilinger|first20=Anton|arxiv=1808.05966|bibcode=2018PhRvL.121h0403R |s2cid=52059624 }}</ref>

The 2019 [[PBS Nova]] episode ''Einstein's Quantum Riddle'' documents this "cosmic Bell test" measurement, with footage of the scientific team on-site at the high-altitude [[Teide Observatory]] located in the [[Canary Islands]].<ref>{{cite web |title=Einstein's Quantum Riddle |url=https://www.pbs.org/wgbh/nova/video/einsteins-quantum-riddle/ |publisher=[[PBS Nova]] |access-date=23 December 2020 |date=9 Jan 2019}}</ref>