Quantum correlations, mixed states, and bistability at the onset of lasing

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Papoff, Francesco and Carroll, Mark Anthony and Lippi, Gian Luca and Oppo, Gian-Luca and D’Alessandro, Giampaolo (2025) Quantum correlations, mixed states, and bistability at the onset of lasing. Physical Review A, 111 (1). L011501. ISSN 2469-9926 (https://doi.org/10.1103/PhysRevA.111.L011501)

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Abstract

We derive a model for a single-mode laser that includes all two-particle quantum correlations between photons and electrons. In contrast to the predictions of semiclassical models, we find that lasing takes place in the presence of quantum bistability between a nonlasing and a nonclassical coherent state. The coherent state is characterized by a central frequency and a finite linewidth and emerges with finite amplitude from a saddle-node bifurcation together with an unstable coherent state. Hence coherent emission in nanolasers originates through a mixing of lasing and nonlasing states. In the limit of a macrolaser with a large number of emitters and nonresonant modes, the laser threshold approaches the prediction of the semiclassical theory, but with the important difference that lasing can be achieved only in the presence of finite-size perturbations.

ORCID iDs

Papoff, Francesco ORCID logoORCID: https://orcid.org/0000-0002-3456-343X, Carroll, Mark Anthony, Lippi, Gian Luca, Oppo, Gian-Luca ORCID logoORCID: https://orcid.org/0000-0002-5376-4309 and D’Alessandro, Giampaolo;
  • Item type:Article
    ID code:91631
    Dates:
    Date
    Event
    7 January 2025
    Published
    17 December 2024
    Accepted
    10 June 2024
    Submitted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:19 Dec 2024 16:47
    Last modified:20 Jan 2025 09:20
    URI:https://strathprints.strath.ac.uk/id/eprint/91631
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