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This video is adapted from 10.3390/e25081117
Quantum contextuality attracted a lot of attention recently. It precludes classically predetermined values from being assigned to quantum states and that enables its application in quantum communication, quantum computation, quantum steering, etc.
The best-known contextual sets are the Kochen-Specker sets. The conditions that define them can be relaxed and that leads us to contextual sets which we call non-Kochen-Specker sets.
In the video, researchers give pedestrian explanations of conditions that define each of these two kinds of sets in a relaxed oyster approach.