Contextual advantage for state-dependent cloning

Seminar date and time: 
Monday, 27 May, 2019 - 12:00
Contact: 
Gabriel.Senno@icfo.eu
Affiliation: 
ICFO, Barcelona
Author: 
Gabriel Senno
Location: 
GIQ Seminar Room (C5/262)

A number of noncontextual models exist which reproduce different subsets of quantum theory and admit a no-cloning theorem. Therefore, if one chooses noncontextuality as one's notion of classicality, no-cloning cannot be regarded as a nonclassical phenomenon. However, in the work that I'll present in this talk, we show that the phenomenology of quantum state cloning is indeed nonclassical, but not for the reasons usually given. Specifically, we focus on the task of state-dependent cloning and prove that the optimal cloning fidelity predicted by quantum theory cannot be explained by any noncontextual model. We derive a noise-robust noncontextuality inequality whose violation by quantum theory not only implies a quantum advantage for the task of state-dependent cloning, but also provides an experimental witness of noncontextuality.

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