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Planar Architecture for Studying a Fluxonium Qubit

  • Quantum Informatics
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Abstract

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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Acknowledgments

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

Funding

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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Authors and Affiliations

  1. National University of Science and Technology MISIS, Moscow, 119049, Russia

    I. N. Moskalenko, I. S. Besedin, I. A. Tsitsilin, N. N. Abramov, A. Grigor’ev & A. V. Ustinov

  2. Moscow Institute of Physics and Technology (National Research University), Dolgoprudnyi, Moscow region, 141701, Russia

    I. A. Tsitsilin, G. S. Mazhorin & A. A. Dobronosova

  3. Bauman Moscow State Technical University, Moscow, 105005, Russia

    I. A. Rodionov, D. O. Moskalev & A. A. Pishchimova

  4. All-Russia Research Institute of Automatics, Moscow, 127055, Russia

    I. A. Rodionov, A. A. Dobronosova & A. A. Pishchimova

  5. Karlsruhe Institute of Technology, Physikalisches Institut, 76131, Karlsruhe, Germany

    A. V. Ustinov

  6. Russian Quantum Center, Skolkovo, Moscow region, 143025, Russia

    A. V. Ustinov

Authors
  1. I. N. Moskalenko
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  2. I. S. Besedin
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  3. I. A. Tsitsilin
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  4. G. S. Mazhorin
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  5. N. N. Abramov
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  6. A. Grigor’ev
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  7. I. A. Rodionov
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  8. A. A. Dobronosova
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  9. D. O. Moskalev
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  10. A. A. Pishchimova
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  11. A. V. Ustinov
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Corresponding author

Correspondence to I. N. Moskalenko.

Additional information

Supplementary materials are available for this article at https://doi.org/10.1134/S0021364019200074 and are accessible for authorized users.

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). https://doi.org/10.1134/S0021364019200074

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  • DOI: https://doi.org/10.1134/S0021364019200074

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