Pulsed single-photon spectroscopy of an emitter with vibrational coupling

• URL: http://arxiv.org/abs/2512.14964v1
• Date: Tue, 16 Dec 2025 23:24:31 GMT
• Title: Pulsed single-photon spectroscopy of an emitter with vibrational coupling
• Authors: Sourav Das, Aiman Khan, Elnaz Darsheshdar, Francesco Albarelli, Animesh Datta,
• Abstract summary: We analytically derive the quantum state of a single-photon pulse scattered from a single quantum two-level emitter interacting with a vibrational bath.<n>We show that vibration-induced dephasing reduces the quantum Fisher information for estimating the emitter's linewidth.
• Score: 4.177878810736875
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We analytically derive the quantum state of a single-photon pulse scattered from a single quantum two-level emitter interacting with a vibrational bath. This solution for the quadripartite system enables an information-theoretic characterization of vibrational effects in quantum light spectroscopy. We show that vibration-induced dephasing reduces the quantum Fisher information (QFI) for estimating the emitter's linewidth, largely reflecting the Franck-Condon suppression of light-matter coupling. Comparing time- and frequency-resolved photodetection, we find the latter to be more informative in estimating the emitter's linewidth for stronger vibrational coupling.

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