Noise-robust preparation contextuality shared between any number of observers via unsharp measurements

Hammad Anwer1, Natalie Wilson1, Ralph Silva2, Sadiq Muhammad1, Armin Tavakoli3,4,5, and Mohamed Bourennane1

1Department of Physics, Stockholm University, S-10691 Stockholm, Sweden
2Institute for Theoretical Physics, ETH Zurich, Switzerland
3Département de Physique Appliquée, Université de Genève, CH-1211 Genève, Switzerland
4Institute for Quantum Optics and Quantum Information - IQOQI Vienna, Austrian Academy of Sciences, Boltzmanngasse 3, 1090 Vienna, Austria
5Institute for Atomic and Subatomic Physics, Vienna University of Technology, 1020 Vienna, Austria

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Multiple observers who independently harvest nonclassical correlations from a single physical system share the system's ability to enable quantum correlations. We show that any number of independent observers can share the preparation contextual outcome statistics enabled by state ensembles in quantum theory. Furthermore, we show that even in the presence of any amount of white noise, there exists quantum ensembles that enable such shared preparation contextuality. The findings are experimentally realised by applying sequential unsharp measurements to an optical qubit ensemble which reveals three shared demonstrations of preparation contextuality.

When a quantum resource is measured, information is extracted from it at the price of distorting the state. Here, we aim to extract information from a quantum ensemble in such a way that classical noncontextual models cannot account for the lab observations, while simultaneously not distorting the ensemble too much to prevent us from doing such an extraction once again. We show that, in fact, one can extract contextual quantum correlations indefinitely many times from a single ensemble and we demonstrate three sequential violations of noncontextuality in an optics experiment.

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