In situ tunable nonlinearity and competing signal paths in coupled superconducting resonators
Fischer M, Chen QM, Besson C, Eder P, Goetz J, Pogorzalek S, Renger M, Xie E, Hartmann M, Fedorov KG, Marx A, Deppe F, Gross R (2021)
Publication Type: Journal article
Publication year: 2021
Journal
Book Volume: 103
Article Number: 094515
Journal Issue: 9
DOI: 10.1103/PhysRevB.103.094515
Abstract
We have fabricated and studied a system of two tunable and coupled nonlinear superconducting resonators. The nonlinearity is introduced by galvanically coupled dc superconducting quantum interference devices. We simulate the system response by means of a circuit model, which includes an additional signal path introduced by the electromagnetic environment. Furthermore, we present two methods allowing us to experimentally determine the nonlinearity. First, we fit the measured frequency and flux dependence of the transmission data to simulations based on the equivalent circuit model. Second, we fit the power dependence of the transmission data to a model that is predicted by the nonlinear equation of motion describing the system. Our results show that we are able to tune the nonlinearity of the resonators by almost two orders of magnitude via an external coil and two on-chip antennas. The studied system represents a basic building block for larger systems, allowing for quantum simulations of bosonic many-body systems with a larger number of lattice sites.
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Germany (DE)How to cite
APA:
Fischer, M., Chen, Q.M., Besson, C., Eder, P., Goetz, J., Pogorzalek, S.,... Gross, R. (2021). In situ tunable nonlinearity and competing signal paths in coupled superconducting resonators. Physical Review B, 103(9). https://doi.org/10.1103/PhysRevB.103.094515
MLA:
Fischer, Michael, et al. "In situ tunable nonlinearity and competing signal paths in coupled superconducting resonators." Physical Review B 103.9 (2021).
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