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Applied Physics Letters

Publisher's Note: “Collective strong coupling with homogeneous Rabi frequencies using a 3D lumped element microwave resonator” [Appl. Phys. Lett. 109 , 033508 (2016)]

Andreas Angerer, Thomas Astner, Daniel Wirtitsch, Hitoshi Sumiya, Shinobu Onoda, Junichi Isoya, Stefan Putz, Johannes Majer

Published Aug 22, 2016• 0 citations
Publisher
DOI
10.1063/1.4961449

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We present a method to identify the coupled, normal modes of a superconducting transmission line with an embedded lumped element circuit. We evaluate the effective transmission-line nonlinearities in the case of Kerr-like Josephson interactions in the circuit and in the case where the embedded circuit constitutes a qubit degree of freedom, which is Rabi coupled to the field in the transmission line. Our theory quantitatively accounts for the very high and positive Kerr nonlinearities observed in a recent experiment [M. Reh\'ak, P. Neilinger, M. Grajcar, G. Oelsner, U. H\"ubner, E. Il'ichev, and H.-G. Meyer, Appl. Phys. Lett. 104, 162604 (2014)], and we can evaluate the accomplishments of modified versions of the experimental circuit.