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Communication Games Reveal Preparation Contextuality
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics. Université de Genève, Switzerland.
Stockholm University, Faculty of Science, Department of Physics.
Number of Authors: 4
2017 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 119, no 22, 220402Article in journal (Refereed) Published
Abstract [en]

A communication game consists of distributed parties attempting to jointly complete a task with restricted communication. Such games are useful tools for studying limitations of physical theories. A theory exhibits preparation contextuality whenever its predictions cannot be explained by a preparation noncontextual model. Here, we show that communication games performed in operational theories reveal the preparation contextuality of that theory. For statistics obtained in a particular family of communication games, we show a direct correspondence with correlations in spacelike separated events obeying the no-signaling principle. Using this, we prove that all mixed quantum states of any finite dimension are preparation contextual. We report on an experimental realization of a communication game involving three-level quantum systems from which we observe a strong violation of the constraints of preparation noncontextuality.

Place, publisher, year, edition, pages
2017. Vol. 119, no 22, 220402
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-149966DOI: 10.1103/PhysRevLett.119.220402ISI: 000416433000001OAI: oai:DiVA.org:su-149966DiVA: diva2:1170046
Available from: 2018-01-02 Created: 2018-01-02 Last updated: 2018-01-02Bibliographically approved

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