TY - JOUR
T1 - Anomalous Weak Values Are Proofs of Contextuality
AU - Pusey, Matthew F.
N1 - © 2014 American Physical Society
PY - 2014/11/12
Y1 - 2014/11/12
N2 - The average result of a weak measurement of some observable A can, under postselection of the measured quantum system, exceed the largest eigenvalue of A. The nature of weak measurements, as well as the presence of postselection and hence possible contribution of measurement disturbance, has led to a long-running debate about whether or not this is surprising. Here, it is shown that such “anomalous weak values” are nonclassical in a precise sense: a sufficiently weak measurement of one constitutes a proof of contextuality. This clarifies, for example, which features must be present (and in an experiment, verified) to demonstrate an effect with no satisfying classical explanation.
AB - The average result of a weak measurement of some observable A can, under postselection of the measured quantum system, exceed the largest eigenvalue of A. The nature of weak measurements, as well as the presence of postselection and hence possible contribution of measurement disturbance, has led to a long-running debate about whether or not this is surprising. Here, it is shown that such “anomalous weak values” are nonclassical in a precise sense: a sufficiently weak measurement of one constitutes a proof of contextuality. This clarifies, for example, which features must be present (and in an experiment, verified) to demonstrate an effect with no satisfying classical explanation.
U2 - 10.1103/PhysRevLett.113.200401
DO - 10.1103/PhysRevLett.113.200401
M3 - Article
SN - 0031-9007
VL - 113
JO - Physical Review Letters
JF - Physical Review Letters
M1 - 200401
ER -
