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Séminaire NANO

Mardi 23 septembre à 9h30,
salle Rémy Lemaire, K223

Orateur : Cyril Branciard (NPSC, Nano, Néel)
"Does a quantum state represent reality, or just our knowledge of it ?"

Abstract :

The status of the wave function has been the subject of active debates since the very birth of quantum theory. What is it ? Does it represent reality, or our knowledge of it ? A general framework has recently been developed, allowing one to address these questions formally. In late 2011 Pusey, Barrett and Rudolph (PBR) proved a breakthrough theorem, suggesting that the knowledge interpretation was not tenable [1]. I will review these results and present new developments, showing in particular that the knowledge interpretation cannot (fully) explain the indistinguishability of nonorthogonal quantum states [2].

[1] M. F. Pusey, J. Barrett, T. Rudolph, Nat. Phys. 8, 475–478 (2012).
[2] J. Barrett et al., Phys. Rev. Lett. 112, 250403 (2014) ; M. S. Leifer, Phys. Rev. Lett. 112, 160404 (2014) ; C. Branciard, Phys. Rev. Lett. 113, 020409 (2014).

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