Analog Approach to Quantum Computing Enhanced Sensing

Quantum information processing can significantly enhance certain quantum sensing tasks. Recent proposals, however, require sophisticated gate sequences with large depth, limiting their accessibility to near-term devices. Since sensing is inherently analog—and fault-tolerant quantum computers could add unnecessary overhead for such targeted tasks—this motivates simpler, purpose-built implementations of quantum-enhanced sensing algorithms. Here, we propose a fully analog implementation of Grover-enhanced, broadband AC signal detection. Our approach requires using only pairwise interactions and a small set of parametric modulations whose number scales logarithmically with the searched bandwidth. By engineering a driven Hamiltonian and working in a suitable rotating frame, the unknown AC signal acts as an effective oracle potential that produces analog Grover dynamics. We characterize performance and robustness via numerical simulations including control noise and decoherence, and discuss feasibility in Rydberg arrays, NV-center registers, and superconducting qubits.