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quant-ph2026
Forbidden Subspaces in Quantum State Smoothing
Chon-Fai Kam, Kai-Wen Wong
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 th…
quant-ph2026
Nodal obstruction to conditioned-diffusion representations of the weak momentum
Chon-Fai Kam, Kai-Wen Wong
Quantum Schrödinger bridge constructions establish the existence of a conditioned process under a positivity hypothesis on the endpoint data, and three independent ones adopt it. W…