title: Experimental contextuality in classical light.
abstract: The Klyachko, Can, Binicioglu, and Shumovsky (KCBS) inequality is an important contextuality inequality in three-level system, which has been demonstrated experimentally by using quantum states. Using the path and polarization degrees of freedom of classical optics fields, we have constructed the classical trit (cetrit), tested the KCBS inequality and its geometrical form (Wright's inequality) in this work. The projection measurement has been implemented, the clear violations of the KCBS inequality and its geometrical form have been observed. This means that the contextuality inequality, which is commonly used in test of the conflict between quantum theory and noncontextual realism, may be used as a quantitative tool in classical optical coherence to describe correlation characteristics of the classical fields.
authors.affiliation: Beijing Key Laboratory of Nanophotonics &Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, 100081, Beijing, China.|Beijing Key Laboratory of Nanophotonics &Ultrafine Optoelectronic Systems, Kunming Institute of Physics, Kunming, 650223, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Li
authors.affiliation: Beijing Key Laboratory of Nanophotonics &Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, 100081, Beijing, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Zeng
authors.affiliation: Beijing Key Laboratory of Nanophotonics &Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, 100081, Beijing, China.
authors.forename: Xinbing
authors.initials: X
authors.lastname: Song
authors.affiliation: Beijing Key Laboratory of Nanophotonics &Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, 100081, Beijing, China.
authors.forename: Xiangdong
authors.initials: X
authors.lastname: Zhang