Simple broadband signal detection at the fundamental limit

• URL: http://arxiv.org/abs/2601.19816v1
• Date: Tue, 27 Jan 2026 17:17:43 GMT
• Title: Simple broadband signal detection at the fundamental limit
• Authors: Anthony M. Polloreno, Graeme Smith,
• Abstract summary: We show that the Grover-like integration-time lower bound for this task is a geometric corollary an upper bound on the integrated quantum Fisher information.<n>We give an all-analog multi-resonant protocol based on a randomized Su-Schrieffer-Heeger control Hamiltonian and an m-register GHZ probe.
• Score: 2.3105015295906837
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Broadband detection of a weak oscillatory field with unknown carrier frequency underlies magnetometry, axion searches and gravitational-wave sensing. We show that the Grover-like integration-time lower bound for this task is a geometric corollary an upper bound on the integrated quantum Fisher information, a metrological constraint. We further give an all-analog multi-resonant protocol based on a randomized Su-Schrieffer-Heeger control Hamiltonian and an m-register GHZ probe and verify near-optimal scaling through simulation.

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