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Communication Games Reveal Preparation Contextuality

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Autor(es):
Hameedi, Alley [1] ; Tavakoli, Armin [1, 2] ; Marques, Breno [3] ; Bourennane, Mohamed [1]
Número total de Autores: 4
Afiliação do(s) autor(es):
[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
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Physical Review Letters; v. 119, n. 22 NOV 29 2017.
Citações Web of Science: 6
Resumo

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)

Processo FAPESP: 14/27223-2 - Controle de informação quântica com variáveis contínuas de feixes de luz
Beneficiário:Breno Marques Goncalves Teixeira
Linha de fomento: Bolsas no Brasil - Pós-Doutorado