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We describe a simple experimental setting where joint measurements performedon a single (classical or quantum) entity can violate both the Bell-CHSHinequality and the marginal laws (also called no-signaling conditions). Onceemitted by a source, the entity propagates within the space of Alice's andBob's detection screens, with the measurements' outcomes corresponding to theentity being absorbed or not absorbed in a given time interval. The violationof the marginal laws results from the fact that the choice of the screen on theside of Alice affects the detection probability on the side of Bob, and viceversa, and we show that for certain screen choices the Bell-CHSH inequality canbe violated up to its mathematical maximum. Our analysis provides aclarification of the mechanisms that could be at play when the Bell-CHSHinequality and marginal laws are violated in entangled bipartite systems, whichwould not primarily depend on the presence of a bipartite structure but on thefact that the latter can manifest as an undivided whole.

Violation of the Bell-CHSH inequality and marginal laws in a single-entity Bell-test experiment