Closing the Objectivity Loophole in Bell Tests on a Public Quantum Computer
Abstract
ABSTRACT We have constructed and run a Bell test of local realism focusing on the objectivity criterion. Objectivity means that the outcomes are macroscopically confirmed by a few observers at each party. The IBM Quantum and IonQ devices turn out to be sufficiently accurate to pass such an extended Bell‐type test, although at the price of communication loopholes and residual but statistically significant signaling. The test also serves as a benchmark of entanglement spread across larger sets of qubits.
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Authors: Adam Bednorz, Josep Amengual i Batle, Tomasz Białecki, J. K. Korbicz
Institutions: University of Warsaw, Polish Academy of Sciences, Lodz University of Technology, University of Łódź, Health Research Institute of the Balearic Islands, Universitat de les Illes Balears, Center for Theoretical Physics