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The principle of `absoluteness of cause' (AC) assumes the cause-effectrelation to be observer independent and is a distinct assertion thanprohibiting occurrence of any causal loop. Here, we study implication of thisnovel principle to derive a fundamental no-go result in quantum world. ACprinciple restrains the `time order' of two spacelike separatedevents/processes to be a potential cause of another event in their commonfuture, and in turn negates existence of a quantum device that transforms anarbitrary pure state to its orthogonal one. The present {\it no-go} result isquite general as its domain of applicability stretches out from the standardlinear quantum theory to any of its generalizations allowing deterministic orstochastic nonlinear evolution. We also analyze different possibilities ofviolating the AC principle in generalized probability theory framework. Astrong form of violation enables instantaneous signaling, whereas a weak formof violation forbids the theory to be locally tomographic. On the other hand,impossibility of an intermediate violation suffices to discard the universalquantum NOT logic.

From no causal loop to absoluteness of cause: discarding the quantum NOT logic