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Universit'e Paris Cit'e

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Preprint Sep 2026

Nodal obstruction to conditioned-diffusion representations of the weak momentum

Quantum Schr\"odinger bridge constructions establish the existence of a conditioned process under a positivity hypothesis on the endpoint data, and three independent ones adopt it. We show that hypothesis fails on a definite locus once the conditioned object is the two-state amplitude $\phi^*\psi$ of a pre- and post-se...

Chon-Fai Kam, Kai-Wen Wong Università degli Studi di Palermo, I. U et al. · 0 citations

Preprint Sep 2026

Forbidden Subspaces in Quantum State Smoothing

A system between a preparation and a post-selection has had no agreed state since 1964. With positivity as the criterion, a post-selection admits an interval of orderings around the symmetric one exactly when the subspace it forbids is spanned by eigenvectors of a full-rank filtered state. Otherwise it certifies contex...

Chon-Fai Kam, Kai-Wen Wong Università degli Studi di Palermo, I. U et al. · 0 citations