Regensburg 2022 – scientific programme

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QI: Fachverband Quanteninformation

QI 14: Quantum Foundations

QI 14.2: Talk

Friday, September 9, 2022, 10:00–10:15, H9

Proposal for demonstrating hidden nonlocality without assumptions — •Jonathan Steinberg, H. Chau Nguyen, and Matthias Kleinmann — University of Siegen, Siegen, Germany

A quantum state with hidden nonlocality does not violate any Bell inequality unless its hidden nonlocality is activated using local filters. This phenomenon has been demonstrated in experiments, however only when special Bell inequalities are considered [Kwiat et al., Nature 409, 1014 (2001)], or under the assumption that the quantum state is constrained to a special form which has a known local hidden variable [Opt. Express 28, 13638 (2020)]. Developing a general method for constructing local models for bipartite systems of a qubit and a qudit, we propose a protocol which allows one to conclusively demonstrate hidden nonlocality which is free from assumptions on both, the form of Bell inequalities and the special form of the state. By an optimization over the states and measurement directions we obtain that the required precision is within reach of near future experiments.