Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 63: Strong Light-Matter Interaction

Q 63.7: Talk

Friday, March 15, 2024, 12:30–12:45, HS 3118

Breakdown of the Jaynes-Cummings model for cavities with small emitter-induced scattering loss. — •Jürgen Volz, Martin Blaha, and Arno Rauschenbeutel — Institut für Physik, Humboldt-Universität zu Berlin

Strong coupling between a single optical mode and a single quantum emitter is key for a plethora of applications in quantum science and technology and is commonly described by means of the Jaynes-Cummings (JC) model. A key aspect of many cavity quantum electrodynamics (CQED) experiments is to maximize the ratio between the emitter-mode coupling rate and the photon loss rates of the system in order to realize a coherent emitter-light interaction.

Here, we show that, surprisingly, the JC model in general does not provide a valid physical description when the emitter-induced scattering loss becomes too small. Indeed, the JC description is only valid when the solid angle covered by the cavity mode is small. We present a Hamiltonian description of CQED that correctly takes into account scattering loss [1]. For the case of large scattering loss, our model’s predictions agree with the JC model, while we observe qualitative and quantitative differences in the situation of large solid state angle cavities. As minimizing scattering loss into free-space modes is one of the key design goals for many experimental setups, e.g., in quantum technology, providing an accurate theoretical description is crucial for developing new and optimizing existing cavity-based quantum protocols.

[1] M. Blaha, A. Rauschenbeutel, J. Volz, arXiv:2301.07674 (2023)

Keywords: Resonator QED; Cavity QED; strong coupling regime