Interaction between quantized light and matter lies at the heart of a broad range of applications, such as frequency down-conversion in ultrastrong cavity QED [1]. Frequency down-conversion schemes are often treated with few-level approximations of the matter subsystem. In the present work, we consider the case of a semiconductor quantum ring described in real space coupled to more than one mode and investigate a down-conversion process. We show that the down-converted photons have unique features such as non-classicality and entanglement. In addition, we show shortcomings of few-level approximations and mean-field theory. An interesting outcome for down-conversion is that ultrastrong coupling is more efficient than just increasing the incoming field strength.
[1] Anton F. Kockum et al., Scientific Reports vol. 7, 5313 (2017).
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Presenters
Davis Dave Welakuh
Max Planck Inst Structure & Dynamics of Matter
Authors
Davis Dave Welakuh
Max Planck Inst Structure & Dynamics of Matter
Mary-Leena Martine Tchenkoue Djouom
Max Planck Inst Structure & Dynamics of Matter
Michael Ruggenthaler
Max Planck Inst Structure & Dynamics of Matter
Heiko Appel
Max Planck Inst Structure & Dynamics of Matter
Theory, Max Planck Institute for the Structure & Dynamics of Matter
Angel Rubio
Theory Department, Max Planck Institute for the Structure and Dynamics of Matter
Center for Computational Quantum Physics (CCQ), The Flatiron Institute
Max Planck Institute for Structure and Dynamics of Matter
Department of Physics, Columbia University, New York, New York 10027, USA
Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany
Max Planck Institute for the Structure and Dynamics of Matter
Structure and Dynamics of Matter, Max Planck Institute
Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany
Max Planck Inst Structure & Dynamics of Matter
Max Planck Institue for the Structure and Dynamics of Matter
Theory, Max Planck Institute for the Structure & Dynamics of Matter
