Witnessing the non-objectivity of an unknown quantum dynamics
- URL: http://arxiv.org/abs/2211.15638v2
- Date: Wed, 7 Dec 2022 16:33:47 GMT
- Title: Witnessing the non-objectivity of an unknown quantum dynamics
- Authors: Davide Poderini, Giovanni Rodari, George Moreno, Emanuele Polino,
Ranieri Nery, Alessia Suprano, Cristhiano Duarte, Fabio Sciarrino and Rafael
Chaves
- Abstract summary: We show that objectivity implies a Bell-like inequality.
Observers probing distinct parts of the environment can agree upon their measurement outcome of a given observable.
But such outcome can be totally uncorrelated from the property of the quantum system that fixed observable should be probing.
- Score: 0.6745502291821955
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Quantum Darwinism offers an explanation for the emergence of classical
objective features -- those we are used to at macroscopic scales -- from
quantum properties at the microscopic level. The interaction of a quantum
system with its surroundings redundantly proliferates information to many parts
of the environment, turning it accessible and objective to different observers.
But given that one cannot probe the quantum system directly, only its
environment, how to witness whether an unknown quantum property can be deemed
objective or not? Here we propose a probabilistic framework to analyze this
question and show that objectivity implies a Bell-like inequality. Among
several other results, we show quantum violations of this inequality, a
device-independent proof of the non-objectivity of quantum correlations that
give rise to the phenomenon we name "collective hallucination": observers
probing distinct parts of the environment can agree upon their measurement
outcome of a given observable but such outcome can be totally uncorrelated from
the property of the quantum system that fixed observable should be probing. We
also implement an appealing photonic experiment where the temporal degree of
freedom of photons is the quantum system of interest, while their polarization
acts as the environment. Employing a fully black-box approach, we achieve the
violation of a Bell inequality, thus certifying the non-objectivity of the
underlying quantum dynamics in a fully device-independent framework.
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