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Planar Architecture for Studying a Fluxonium Qubit

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The spectral and temporal characteristics of a fluxonium qubit coupled to a coplanar resonator on a chip have been experimentally studied. The system has been implemented as a planar integral electric circuit, where the fluxonium qubit itself consists of a tunnel Josephson junction with a small area shunted by a high inductance of a series of Josephson junctions with larger areas. To analyze the experimental data, an extended model of the fluxonium qubit capacitively coupled to the resonator has been proposed, and the structure of the energy levels has been obtained by full diagonalization of the Hamiltonian of the system. Numerical predictions of the model allow interpreting the results of two-tone spectroscopy obtained at various external magnetic fluxes in a wide frequency range.

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The samples were fabricated at the Nanofabrication Facility Functional Micro/Nanosystems (ID 74300), Bauman Moscow State Technical University


The development of a theoretical model to describe the fluxonium qubit coupled to the coplanar resonator, as well as the development of layer-by-layer geometry and fabrication of experimental fluxonium samples, was supported by the Russian Science Foundation (project no. 19-42-04137). Experimental studies of the spectral and temporal characteristics of fluxonium qubits were supported by the Ministry of Science and Higher Education of the Russian Federation (project no. K2A-2018-048).

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Correspondence to I. N. Moskalenko.

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Russian Text © The Author(s), 2019, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2019, Vol. 110, No. 8, pp. 569–574.

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Moskalenko, I.N., Besedin, I.S., Tsitsilin, I.A. et al. Planar Architecture for Studying a Fluxonium Qubit. Jetp Lett. 110, 574–579 (2019).

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