Down-conversion processes in ab initio nonrelativistic quantum electrodynamics

Phys. Rev. Research 3, 033067 (2021)

Down-conversion processes in ab initio nonrelativistic quantum electrodynamics

Davis M. Welakuh, Michael Ruggenthaler, Mary-Leena M. Tchenkoue, Heiko Appel,, Angel Rubio

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.

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We would like to thank Frank Schlawin, Nicolas Tancogne- Dejean, and Arunangshu Debnath for insightful discussions and Sebastian Ohlmann for the help with the efficient massive parallel implementation of our code. We acknowledge financial support from the European Research Council (Grant No. ERC-2015-AdG-694097) and the SFB925 “Light induced dynamics and control of correlated quantum systems.” This work was supported by the Excellence Cluster “CUI: Advanced Imaging of Matter” of the Deutsche Forschungsgemeinschaft, EXC 2056, Project No. 390715994.

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