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  • Letter
  • Open Access
  • Access by Xinjiang University

Optimal quantum spectroscopy using single-photon pulses

Sourav Das1,*, Aiman Khan2,†, Francesco Albarelli3,‡, and Animesh Datta1,§

  • *Contact author: sourav.iisermohali@gmail.com
  • †Contact author: aimankhan1509@protonmail.com
  • ‡Contact author: francesco.albarelli@gmail.com
  • §Contact author: animesh.datta@warwick.ac.uk
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Phys. Rev. A 113, L030402 – Published 13 March, 2026

DOI: https://doi.org/10.1103/dv49-gwsb

Abstract

We provide the ultimate precision attainable in spectroscopy of a quantum emitter using single-photon pulses. We find that the maximum precision of linewidth estimation is independent of the details of the emitter's bare Hamiltonian, though this is not true for the detunings. We also identify optimal pulse shapes attaining these precisions.

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Outline

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Phys. Rev. A 113, L030402– Published 13 March, 2026
  • Received 15 October 2025
  • Accepted 24 February 2026
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