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

• URL: http://arxiv.org/abs/2410.00588v2
• Date: Wed, 2 Oct 2024 08:29:42 GMT
• Title: Quantum correlations, mixed states and bistability at the onset of lasing
• Authors: Francesco Papoff, Mark Anthony Carroll, Gian Luca Lippi, Gian-Luca Oppo, Giampaolo D'Alessandro,
• Abstract summary: We derive a model for a single mode laser that includes all two particle quantum correlations between photons and electrons. We find that lasing takes place in the presence of quantum bistability between a non-lasing and a non-classical coherent state.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• 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 semi-classical models, we find that lasing takes place in the presence of quantum bistability between a non-lasing and a non-classical 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 non-lasing states. In the limit of a macrolaser with a large number of emitters and non-resonant modes, the laser threshold approaches the prediction of the semi-classical theory, but with the important difference that lasing can be achieved only in the presence of finite size perturbations.

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