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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Communication Games Reveal Preparation Contextuality

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Hameedi, Alley [1] ; Tavakoli, Armin [1, 2] ; Marques, Breno [3] ; Bourennane, Mohamed [1]
Total Authors: 4
[1] Stockholm Univ, Dept Phys, S-10691 Stockholm - Sweden
[2] Univ Geneva, Grp Phys Appl, CH-1211 Geneva - Switzerland
[3] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Physical Review Letters; v. 119, n. 22 NOV 29 2017.
Web of Science Citations: 6

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. (AU)

FAPESP's process: 14/27223-2 - Control of quantum information with continuous variables of light beams
Grantee:Breno Marques Goncalves Teixeira
Support type: Scholarships in Brazil - Post-Doctorate