Quantum entanglement, weak measurements and the conjunction and disjunction fallacies

The conjunction and disjunction fallacies are expressions of irrational judgments. We propose a quantum cognition model that represents each concept as a separate qubit and the measurement process as a weak measurement. Using an on-line questionnaire, we analyzed the relation between irrational judgment and the corresponding quantum state entanglement. The model enables us to follow an individuals' quantum cognitive representation throughout the questionnaire and shows that, on average, participants get more entangled as they progress in the questionnaire. Our model accounts for multiple concepts simultaneously for rational and irrational decisions and suggests that quantum entanglement of mental concepts is correlated with irrational judgments.