Bayes-Optimal Quantum Computational Sensing via Convex Spectral Design

arXiv:2611.10146v1 Announce Type: new Abstract: Quantum computational sensing performs task-specific inference directly through coherent sensing dynamics, avoiding an intermediate estimation step. Existing designs, however, typically optimize quantum control parameters through nonconvex programs whose performance can depend strongly on initialization. This contribution formulates binary phase classification directly in terms of the sensor's measurement response. For a fixed query budget, generalized quantum signal processing (GQSP) restricts this response to a bounded trigonometric polynomial, while the Bayes classification error is linear in the response. These properties yield an exact finite-dimensional semidefinite program for the globally Bayes-optimal sensor response.