Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 35: Laser Development and Applications (Spectroscopy)
Q 35.2: Vortrag
Mittwoch, 8. März 2017, 14:45–15:00, P 5
Quantum metamaterials as an active lasing medium: Effects of disorder — •Martin Koppenhöfer1,2, Michael Marthaler2, and Gerd Schön2 — 1University of Basel, Basel, Switzerland — 2Karlsruhe Institute of Technology, Karlsruhe, Germany
A metamaterial formed by artificial atoms, e.g., superconducting circuits or quantum dots, can serve as an active lasing medium when coupled to a microwave resonator. For these artificial atoms, in contrast to real atoms, variations in their parameters cannot be avoided. We examine the influence of disorder on such a multiatom lasing setup. We find that the lasing process evolves into a self-organized stationary state that is quite robust against disorder. The reason is that photons created by those atoms which are in or close to resonance with the resonator stimulate the emission also of more detuned atoms. Not only the number of photons grows with the number of atoms but also the width of the resonance as a function of the detuning. Similar properties are found for other types of disorder such as variations in the individual coupling. We present relations on how the allowed disorder scales with the number of atoms and confirm it by a numerical analysis. We also provide estimates for the sample-to-sample variations to be expected for setups with moderate numbers of atoms.