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    Two-photon superradiance and subradiance

    Wenxuan Xie*

    Imran M. Mirza†

    John C. Schotland‡

    • Department of Applied Physics, Yale University, New Haven, Connecticut 06511, USA

    • Macklin Quantum Information Sciences, Department of Physics, Miami University, Oxford, Ohio 45056, USA

    • Department of Mathematics and Department of Physics, Yale University, New Haven, Connecticut 06511, USA

    • *Contact author: wenxuan.xie@yale.edu
    • †Contact author: mirzaim@miamioh.edu
    • ‡Contact author: john.schotland@yale.edu
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    Phys. Rev. A 112, 043712 – Published 8 October, 2025

    DOI: https://doi.org/10.1103/dbny-pjqc

    Abstract

    We consider the problem of two-photon cooperative emission in systems of two-level atoms. Two physically distinct regimes are analyzed. First, we investigate the case of a small number of atoms. We study the evolution of two-photon super- and subradiant states and the associated two-photon spectra. Second, we investigate the problem of atoms at constant density confined to a spherical volume. We analyze separately the cases in which the radius is small or large compared to the resonant wavelength.

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    Phys. Rev. A 112, 043712– Published 8 October, 2025
    • Received 19 May 2025
    • Accepted 16 September 2025
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