Nonclassicality, quasiprobabilities and weak values explored in neutron interferometry

Résumé :

The violation of Bell inequalities has demonstrated that quantum mechanics exhibits features with no classical counterpart; however, identifying the boundary between quantumness and classicality remains a nontrivial task. Quasiprobability representations and weak values are valuable tools for investigating these boundaries, and their physical relevance has been confirmed across a range of impactful experiments. Several of these experiments have been implemented in neutron interferometry, a platform that has historically played a central role in the study of foundational quantum mechanics and nonclassicality. Compared to typical photonic implementations, it is less susceptible to classical reinterpretations, as it involves a single massive particle in a superposition of two or three spatially separated paths. Moreover, it offers several experimental advantages, such as macroscopic beam separation, individual control of the sub-beams, and long interaction and coherence times at room temperature and ambient pressure. In this talk, I will introduce weak values and quasiprobabilities as tools to investigate the quantum–classical boundary and present results obtained in neutron interferometry.
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