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  • Open Access

Spectral correlations of dynamical resonance fluorescence

Santiago Bermúdez-Feijóo1,*,†, Eduardo Zubizarreta Casalengua2,*,‡, Kai Müller2, and Klaus D. Jöns1

  • 1Institute for Photonic Quantum Systems (PhoQS), Center for Optoelectronics and Photonics Paderborn (CeOPP), and Department of Physics, Paderborn University, 33098 Paderborn, Germany
  • 2Walter Schottky Institute, School of Computation, Information and Technology and MCQST, Technische Universität München, 85748 Garching, Germany

  • *These authors contributed equally to this work.
  • †Contact author: santiago.bermudez@uni-paderborn.de
  • ‡Contact author: eduardo.zubizarreta@tum.de
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Phys. Rev. Research 7, 033296 – Published 29 September, 2025

DOI: https://doi.org/10.1103/jmy9-bd3l

Abstract

Frequency-filtered photon correlations have been proven to be extremely useful in grasping how the detection process alters photon statistics. Harnessing the spectral correlations also permits refinement of the emission and unraveling of previously hidden strong correlations in a plethora of quantum-optical systems under continuous-wave excitation. In this work, we investigate such correlations for time-dependent excitation and develop a methodology to compute efficiently time-integrated correlations, which are at the heart of the photon-counting theory, and subsequently apply it to analyze the photon emission of pulsed systems. By combining this formalism with the sensor method—which facilitates frequency-resolved correlations—we demonstrate how spectral filtering enhances single-photon purity and suppresses multiphoton noise in time-bin-encoded quantum states. Specifically, filtering the central spectral peak of a dynamically driven two-level system boosts temporal coherence and improves the fidelity of time-bin entanglement preparation, even under conditions favoring multiphoton emission. These results establish spectral filtering as a critical tool for tailoring photon statistics in pulsed quantum light sources.

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Phys. Rev. Research 7, 033296– Published 29 September, 2025
  • Received 8 April 2025
  • Accepted 29 July 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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