Speaker
Michał Banacki, University of Cologne
Abstract
Motivated by Tsirelson’s problem for sets of quantum correlations, we investigate a bipartite steering scenario in which the local subsystems of the separated parties are modeled by operator algebras. Using an operational characterization of unital C*-algebras with the Weak Expectation Property, we demonstrate the existence of a gap between quantum steering descriptions based on the tensor product model and the commuting operator model. Furthermore, we establish a no-go result for post-quantum steering. We also demonstrate that the identified gap between steering models is independent of nonlocality effects arising from the refutation of Tsirelson’s conjecture. Finally, we discuss an auxiliary observation related to free probability.