title: Experimental observation of Hardy-like quantum contextuality.
abstract: Contextuality is a fundamental property of quantum theory and a critical resource for quantum computation. Here, we experimentally observe the arguably cleanest form of contextuality in quantum theory [A. Cabello et al., Phys. Rev. Lett. 111, 180404 (2013)] by implementing a novel method for performing two sequential measurements on heralded photons. This method opens the door to a variety of fundamental experiments and applications.
authors.affiliation: Department of Physics, Stockholm University, S-10691 Stockholm, Sweden.
authors.forename: Breno
authors.initials: B
authors.lastname: Marques
authors.affiliation: Department of Physics, Stockholm University, S-10691 Stockholm, Sweden.
authors.forename: Johan
authors.initials: J
authors.lastname: Ahrens
authors.affiliation: Department of Physics, Stockholm University, S-10691 Stockholm, Sweden and Instytut Fizyki Teoretycznej i Astrofizyki, Uniwersytet Gdański, PL-80-952 Gdańsk, Poland.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Nawareg
authors.affiliation: Departamento de Física Aplicada II, Universidad de Sevilla, E-41012 Sevilla, Spain.
authors.forename: Adán
authors.initials: A
authors.lastname: Cabello
authors.affiliation: Department of Physics, Stockholm University, S-10691 Stockholm, Sweden.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Bourennane