Quantum Bayesian retrodiction provably surpasses classical learning at a sharp threshold: 5-outcome measurements violate classical bounds, while ≤4-outcome measurements remain classically explainable—distinguishable by observer predictions alone.

#QuantumInference #BayesianLearning #Research

Establishes global Bayes optimality for quantum state prediction: highest-weight measurements provably maximize information from measured quantum copies to predict unmeasured ones, with exact fundamental performance bounds.

#QuantumInference #QuantumMeasurement #Research