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SUMMARY:Witnessing nonclassicality from statistical proofs of the Kochen-S
pecker theorem
DTSTART;VALUE=DATE-TIME:20180117T060000Z
DTEND;VALUE=DATE-TIME:20180117T070000Z
DTSTAMP;VALUE=DATE-TIME:20180920T031037Z
UID:indico-event-6167@cern.ch
DESCRIPTION:This talk will focus on the question of what precise signature
s one should look for in an experiment to rule out the possibility that it
admits a well- defined classical model. By a “classical” model\, I re
fer to a particular notion of classicality\, namely\, noncontextuality\, i
nspired by the Kochen Specker theorem. The Kochen-Specker theorem is a mat
hematical result that points out the inconsistency between quantum theory
and any putative underlying model of it where the outcomes of a measuremen
t are fixed prior to the act of measurement (that is\, deterministically)
by some (possibly hidden) physical states of the system in a manner that d
oes not depend on (operationally irrelevant) details of the measurement co
ntext\, i.e.\, the assignments are fixed noncontextually in the model. Thi
s theorem is not experimentally testable\, unlike Bell’s theorem\, becau
se of idealizations (such as noiseless measurements and outcome determinis
m) that are implicit in its statement. I will describe some recent work on
how to go from statistical proofs of the Kochen-Specker theorem to noise-
robust signatures of the failure of noncontextuality. Making minimal assum
ptions about the operational theory describing the experiment\, such signa
tures do not rely on the validity of the entire quantum formalism. In othe
r words\, they can be used to assess nonclassicality even if an experiment
admits deviations from quantum theory. Based on arXiv:1708.04793 and 1709
.01098 [quant-ph].\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.
py?confId=6167
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6167
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