title: Classical Physics and the Bounds of Quantum Correlations.
abstract: A unifying principle explaining the numerical bounds of quantum correlations remains elusive, despite the efforts devoted to identifying it. Here, we show that these bounds are indeed not exclusive to quantum theory: for any abstract correlation scenario with compatible measurements, models based on classical waves produce probability distributions indistinguishable from those of quantum theory and, therefore, share the same bounds. We demonstrate this finding by implementing classical microwaves that propagate along meter-size transmission-line circuits and reproduce the probabilities of three emblematic quantum experiments. Our results show that the "quantum" bounds would also occur in a classical universe without quanta. The implications of this observation are discussed.
authors.affiliation: Departamento de Física Aplicada II, Universidad de Sevilla, E-41012 Sevilla, Spain.
authors.forename: Diego
authors.initials: D
authors.lastname: Frustaglia
authors.affiliation: Departamento de Física Aplicada II, Universidad de Sevilla, E-41012 Sevilla, Spain.
authors.forename: José P
authors.initials: JP
authors.lastname: Baltanás
authors.affiliation: Departamento de Electrónica y Electromagnetismo, Universidad de Sevilla, E-41012 Sevilla, Spain.
authors.forename: María C
authors.initials: MC
authors.lastname: Velázquez-Ahumada
authors.affiliation: Departamento de Electrónica y Electromagnetismo, Universidad de Sevilla, E-41012 Sevilla, Spain.
authors.forename: Armando
authors.initials: A
authors.lastname: Fernández-Prieto
authors.affiliation: Departamento de Electrónica y Electromagnetismo, Universidad de Sevilla, E-41012 Sevilla, Spain.
authors.forename: Aintzane
authors.initials: A
authors.lastname: Lujambio
authors.affiliation: Departamento de Física Aplicada I, Universidad de Sevilla, E-41011 Sevilla, Spain.
authors.forename: Vicente
authors.initials: V
authors.lastname: Losada
authors.affiliation: Departamento de Electrónica y Electromagnetismo, Universidad de Sevilla, E-41012 Sevilla, Spain.
authors.forename: Manuel J
authors.initials: MJ
authors.lastname: Freire
authors.affiliation: Departamento de Física Aplicada II, Universidad de Sevilla, E-41012 Sevilla, Spain.
authors.forename: Adán
authors.initials: A
authors.lastname: Cabello