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arXiv · 2610.08749

No-Disturbance-without-Uncertainty generates the Quantum set in the simplest Bell scenario

Ravishankar Ramanathan
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Abstract

Characterizing the set of quantum nonlocal correlations through information-theoretic constraints is a central problem in quantum foundations. We show that the convex hull of no-signalling behaviors in a bipartite Bell experiment satisfying a common-overlap no-disturbance-without-uncertainty condition is exactly the finite-dimensional quantum set whenever one party has two binary measurements and the other has an arbitrary finite number of settings, each with an arbitrary finite number of outcomes. In the simplest binary input-output Bell scenario, this characterizes the full eight-dimensional set of quantum behaviors, including the local marginals. The proof constructs a quantum realization directly from the conditional probabilities and no-signalling. The characterization also reduces optimization of any linear Bell expression in these scenarios to maximization over a one-parameter family of second-order cone programs. The results establish a connection between local uncertainty-disturbance constraints and quantum nonlocality, mediated by no-signalling and shared classical randomness.

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Ravishankar Ramanathan. 2026-10-06. No-Disturbance-without-Uncertainty generates the Quantum set in the simplest Bell scenario. https://arxiv.org/abs/2610.08749

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