Seminários

Seminário de Óptica e Informação Quântica

Gostaríamos de convidar a todos para o seminário do grupo de Óptica e Informação Quântica dessa semana

Data: Sexta-Feira 30/09/2016, Sala A5-01, 11 am.

Palestrante: Renato M. Angelo (UFPR)

Título: A measure of physical reality

Abstract: From the premise that an observable is real after it is measured, we envisage a tomography-based protocol that allows us to propose a quantifier for the degree of indefiniteness of an observable given a quantum state. Then, we find that the reality of an observable can be inferred locally only if this observable is not quantumly correlated with an informer. In other words, quantum discord precludes Einstein's notion of separable realities. Also, by monitoring changes in the local reality upon measurements on a remote system, we are led to define a measure of nonlocality. Proved upper bounded by discordlike correlations and requiring indefiniteness as a basic ingredient, our measure signals nonlocality even for separable states, thus revealing nonlocal aspects that are not captured by Bell inequality violations.

Europhysics Letters 112, 40005 (2015)