2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/154614The Feynman integral can be seen as an attempt to relate, under certain circumstances, the quantum-information-theoretic separateness of mutually unbiased bases to causal proximity of the measuring processes.v3: fixed typos v2: two reference added, fixed some typos and one obvious error, 12 pagesQuantum PhysicsHigh Energy Physics - TheoryMathematical Physicstext