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    Landau-Zener-Stückelberg-Majorana interferometry of a superconducting qubit in front of a mirror

    P. Y. Wen1, O. V. Ivakhnenko2,3, M. A. Nakonechnyi2, B. Suri4, J.-J. Lin1, W.-J. Lin5, J. C. Chen1, S. N. Shevchenko2,3,6,*, Franco Nori3,7 et al.

    I.-C. Hoi1,8,†

    • 1Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan
    • 2B. Verkin Institute for Low Temperature Physics and Engineering, Kharkov 61103, Ukraine
    • 3Theoretical Quantum Physics Laboratory, Cluster for Pioneering Research, RIKEN, Wako-shi, Saitama 351-0198, Japan
    • 4Department of Instrumentation and Applied Physics, Indian Institute of Science, Bengaluru 560012, India
    • 5Department of Physics, National Taiwan University, Taipei 10617, Taiwan
    • 6V. N. Karazin Kharkiv National University, Kharkov 61022, Ukraine
    • 7Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA
    • 8Center for Quantum Technology, National Tsing Hua University, Hsinchu 30013, Taiwan

    • *sshevchenko@ilt.kharkov.ua
    • †ichoi@phys.nthu.edu.tw
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    Phys. Rev. B 102, 075448 – Published 31 August, 2020

    DOI: https://doi.org/10.1103/PhysRevB.102.075448

    Abstract

    We investigate the Landau-Zener-Stückelberg-Majorana interferometry of a superconducting qubit in a semi-infinite transmission line terminated by a mirror. The transmon-type qubit is at the node of the resonant electromagnetic (EM) field, “hiding” from the EM field. We modulate the resonant frequency of the qubit by applying a sinusoidal flux pump. We perform spectroscopy by measuring the reflection coefficient of a weak probe in the system. Remarkable interference patterns emerge in the spectrum, which can be interpreted as multiphoton resonances in the dressed qubit. Our calculations agree well with the experiments.

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    Phys. Rev. B 102, 075448– Published 31 August, 2020
    • Received 1 March 2020
    • Revised 19 July 2020
    • Accepted 16 August 2020
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