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Observation of a collective mode of an array of transmon qubits

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Abstract

Arrays of transmon qubits coupled to a λ/2 superconducting coplanar waveguide resonator have been studied by microwave spectroscopy. The emergence of a collective mode has been discovered for a cluster of N > 5 qubits, whose coupling constant to the electromagnetic field in the resonator is √N times greater compared to a single qubit. In addition, the emergence of collective multiphoton transitions exciting higher levels of a qubit cluster has been demonstrated and the interaction of an individual qubit with such a cluster has been investigated.

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Authors and Affiliations

  1. National Research Technological University MISiS, Moscow, 119049, Russia

    K. V. Shulga, M. V. Fistul & A. V. Ustinov

  2. Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russia

    K. V. Shulga

  3. Physikalisches Institut, Karlsruhe Institute of Technology, D-76131, Karlsruhe, Germany

    P. Yang, M. Weides & A. V. Ustinov

  4. Theoretische Physik III, Ruhr-Universität Bochum, D-44801, Bochum, Germany

    M. V. Fistul

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

    K. V. Shulga, G. P. Fedorov, M. V. Fistul & A. V. Ustinov

  6. Moscow Institute of Physics and Technology (State University), Dolgoprudnyi, Moscow region, 141700, Russia

    K. V. Shulga & G. P. Fedorov

Authors
  1. K. V. Shulga
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  2. P. Yang
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  3. G. P. Fedorov
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  4. M. V. Fistul
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  5. M. Weides
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  6. A. V. Ustinov
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Corresponding author

Correspondence to K. V. Shulga.

Additional information

Original Russian Text © K.V. Shulga, P. Yang, G.P. Fedorov, M.V. Fistul, M. Weides, A.V. Ustinov, 2017, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2017, Vol. 105, No. 1, pp. 38–42.

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Shulga, K.V., Yang, P., Fedorov, G.P. et al. Observation of a collective mode of an array of transmon qubits. Jetp Lett. 105, 47–50 (2017). https://doi.org/10.1134/S0021364017010143

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  • DOI: https://doi.org/10.1134/S0021364017010143

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