A projector overlap matrix unifies contextuality indicators and yields S2 as a state-independent witness that remains positive for KCBS contextuality even when Maassen-Uffink bounds become trivial.
R´ enyi, inProceedings of the Fourth Berkeley Sympo- sium on Mathematical Statistics and Probability, 1960, Vol
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Contextuality from the Projector Overlap Matrix
A projector overlap matrix unifies contextuality indicators and yields S2 as a state-independent witness that remains positive for KCBS contextuality even when Maassen-Uffink bounds become trivial.