A 3D quantum configuration (Yu-Oh) is shown to need four colors in any consistent coloring even though every measurement context has three outcomes, giving a chromatic analogue of Kochen-Specker contextuality.
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Chromatic Quantum Contextuality
A 3D quantum configuration (Yu-Oh) is shown to need four colors in any consistent coloring even though every measurement context has three outcomes, giving a chromatic analogue of Kochen-Specker contextuality.