Stimulated emission for a three-level artificial atom in waveguide quantum electrodynamics

Abstract:This work is devoted to a theoretical study of the interaction of a quantum three-level ladder system with a continuous electromagnetic field in a one-dimensional open waveguide. We consider a situation closely resembling stimulated emission - the scattering of a single-photon exponential pulse by an excited three-level emitter. Using the real-space formalism, we obtain an analytical expression for the wavefunction of our system. We show that, for the low anharmonicity of a three-level system inherent to a transmon (the most common type of artificial atom), the influence of the third level can have a significant effect on the system's behavior. Namely, the presence of the third level largely suppresses the stimulated emission effect if the relative anharmonicity is lower than $| \alpha_r | < 4\%$. However, for a three-level system, it is possible to obtain correlation effects such as photon bunching in the reflected field, which can also be 'switched off' by tuning the incident photon parameters.

arXiv:2610.09776 [quant-ph]

(or arXiv:2610.09776v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2610.09776 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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