Down-conversion processes in ab initio nonrelativistic quantum electrodynamics

Welakuh, D.; Ruggenthaler, M.; Tchenkoue Djouom, M.-L.; Appel, H.; Rubio, A.

doi:10.1103/PhysRevResearch.3.033067

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Down-conversion processes in ab initio nonrelativistic quantum electrodynamics

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Welakuh, D.
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science;
Department of Physics, Universität Hamburg;

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Ruggenthaler, M.
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science;
Department of Physics, Universität Hamburg;
The Hamburg Center for Ultrafast Imaging, Universität Hamburg;

/persons/resource/persons241951

Tchenkoue Djouom, M.-L.
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science;
Department of Physics, Universität Hamburg;

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Appel, H.
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science;
Department of Physics, Universität Hamburg;

/persons/resource/persons22028

Rubio, A.
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science;
Department of Physics, Universität Hamburg;
The Hamburg Center for Ultrafast Imaging, Universität Hamburg;
Center for Computational Quantum Physics, Flatiron Institute;

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https://arxiv.org/abs/2103.06947
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https://dx.doi.org/10.1103/PhysRevResearch.3.033067
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PhysRevResearch.3.033067.pdf
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Citation

Welakuh, D., Ruggenthaler, M., Tchenkoue Djouom, M.-L., Appel, H., & Rubio, A. (2021). Down-conversion processes in ab initio nonrelativistic quantum electrodynamics. Physical Review Research, 3(3): 033067. doi:10.1103/PhysRevResearch.3.033067.

Cite as: https://hdl.handle.net/21.11116/0000-0008-27FF-E

Abstract

The availability of efficient photon sources with specific properties is important for quantum-technological applications. However, the realization of such photon sources is often challenging and hence alternative perspectives that suggest different means to enhance desired properties while suppressing detrimental processes are valuable. In this work we highlight that ab initio simulations of coupled light-matter systems can provide such alternative avenues. We show for a simple model of a quantum ring that by treating light and matter on equal footing, we can create and enhance pathways for down-conversion processes. By changing the matter subsystem as well as the photonic environment in experimentally feasible ways, we can engineer hybrid light-matter states that enhance at the same time the efficiency of the down-conversion process and the nonclassicality of the created photons. Furthermore, we show that this also leads to a faster down-conversion, potentially avoiding detrimental decoherence effects.