Simple proof that anomalous weak values require coherence
Rafael Wagner, Ernesto F. Galvão
Abstract
The significance of anomalous weak values has been a matter of great debate in quantum foundations and quantum information. Here, a simple proof shows that the weak-value anomaly requires both negativity of a certain quasiprobability representation and coherence of pre- and postselected states in the observable's basis.
Topics & Concepts
ObservableSimple (philosophy)Coherence (philosophical gambling strategy)PhysicsNegativity effectBasis (linear algebra)Anomaly (physics)Theoretical physicsQuantum mechanicsQuantumRepresentation (politics)Statistical physicsMathematicsPhilosophyEpistemologyGeometrySocial psychologyPsychologyPolitical sciencePoliticsLawQuantum Mechanics and ApplicationsQuantum Information and Cryptography