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Motional averaging in a superconducting qubit

Author

Listed:
  • Jian Li

    (O. V. Lounasmaa Laboratory, Aalto University School of Science, P.O. Box 15100, FI-00076 AALTO, Espoo, Finland)

  • M.P. Silveri

    (University of Oulu)

  • K.S. Kumar

    (O. V. Lounasmaa Laboratory, Aalto University School of Science, P.O. Box 15100, FI-00076 AALTO, Espoo, Finland)

  • J.-M. Pirkkalainen

    (O. V. Lounasmaa Laboratory, Aalto University School of Science, P.O. Box 15100, FI-00076 AALTO, Espoo, Finland)

  • A. Vepsäläinen

    (O. V. Lounasmaa Laboratory, Aalto University School of Science, P.O. Box 15100, FI-00076 AALTO, Espoo, Finland)

  • W.C. Chien

    (O. V. Lounasmaa Laboratory, Aalto University School of Science, P.O. Box 15100, FI-00076 AALTO, Espoo, Finland)

  • J. Tuorila

    (University of Oulu)

  • M.A. Sillanpää

    (O. V. Lounasmaa Laboratory, Aalto University School of Science, P.O. Box 15100, FI-00076 AALTO, Espoo, Finland
    Aalto University School of Science)

  • P.J. Hakonen

    (O. V. Lounasmaa Laboratory, Aalto University School of Science, P.O. Box 15100, FI-00076 AALTO, Espoo, Finland)

  • E.V. Thuneberg

    (University of Oulu)

  • G.S. Paraoanu

    (O. V. Lounasmaa Laboratory, Aalto University School of Science, P.O. Box 15100, FI-00076 AALTO, Espoo, Finland)

Abstract

Superconducting circuits with Josephson junctions are promising candidates for developing future quantum technologies. Of particular interest is to use these circuits to study effects that typically occur in complex condensed-matter systems. Here we employ a superconducting quantum bit—a transmon—to perform an analogue simulation of motional averaging, a phenomenon initially observed in nuclear magnetic resonance spectroscopy. By modulating the flux bias of a transmon with controllable pseudo-random telegraph noise we create a stochastic jump of its energy level separation between two discrete values. When the jumping is faster than a dynamical threshold set by the frequency displacement of the levels, the initially separate spectral lines merge into a single, narrow, motional-averaged line. With sinusoidal modulation a complex pattern of additional sidebands is observed. We show that the modulated system remains quantum coherent, with modified transition frequencies, Rabi couplings, and dephasing rates. These results represent the first steps towards more advanced quantum simulations using artificial atoms.

Suggested Citation

  • Jian Li & M.P. Silveri & K.S. Kumar & J.-M. Pirkkalainen & A. Vepsäläinen & W.C. Chien & J. Tuorila & M.A. Sillanpää & P.J. Hakonen & E.V. Thuneberg & G.S. Paraoanu, 2013. "Motional averaging in a superconducting qubit," Nature Communications, Nature, vol. 4(1), pages 1-6, June.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms2383
    DOI: 10.1038/ncomms2383
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    Cited by:

    1. Yu Zhou & Zhenxing Zhang & Zelong Yin & Sainan Huai & Xiu Gu & Xiong Xu & Jonathan Allcock & Fuming Liu & Guanglei Xi & Qiaonian Yu & Hualiang Zhang & Mengyu Zhang & Hekang Li & Xiaohui Song & Zhan Wa, 2021. "Rapid and unconditional parametric reset protocol for tunable superconducting qubits," Nature Communications, Nature, vol. 12(1), pages 1-8, December.

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