Super-Heisenberg-limited Sensing via Collective Subradiance in Waveguide QED

• URL: http://arxiv.org/abs/2512.14463v1
• Date: Tue, 16 Dec 2025 14:49:19 GMT
• Title: Super-Heisenberg-limited Sensing via Collective Subradiance in Waveguide QED
• Authors: Xin Wang, Zeyang Liao,
• Abstract summary: We explore the quantum-metrological potential of subwavelength-spaced emitter arrays coupled to a one-dimensional nanophotonic waveguide.<n>Strong dipole--dipole interactions profoundly modify the collective optical response, leading to the emergence of ultranarrow subradiant resonances.<n>Our work bridges many-body waveguide quantum electrodynamics and high-precision sensing, opening a route toward scalable quantum sensors on integrated nanophotonic platforms.
• Score: 3.6641231031729173
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We explore the quantum-metrological potential of subwavelength-spaced emitter arrays coupled to a one-dimensional nanophotonic waveguide. In this system, strong dipole--dipole interactions profoundly modify the collective optical response, leading to the emergence of ultranarrow subradiant resonances. Through an eigenmode analysis of the effective non-Hermitian Hamiltonian, we derive a universal scaling law for the decay rate of the most subradiant state, which exhibits an $ N^{-3} $ scaling with even-odd oscillatory behavior in the deep-subwavelength regime. This scaling is directly observable in the single-photon scattering spectrum, enabling the detection of minute changes in atomic separation with a figure of merit that scales as $ N^3 $. The quantum Fisher information (QFI) scales as $N^6$ and can be closely approached by measuring spectral shifts near the steepest slope of the most subradiant resonance. These enhancements remain robust under realistic positional disorder, confirming that dipole--dipole-engineered subradiance provides a viable resource for quantum metrology. Our work bridges many-body waveguide quantum electrodynamics and high-precision sensing, opening a route toward scalable quantum sensors on integrated nanophotonic platforms.

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