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<p>High kinetic inductance superconductors are gaining increasing interest for the realisation of qubits, amplifiers and detectors. Moreover, thanks to their high impedance, quantum buses made of such materials enable large zero-point fluctuations of the voltage, boosting the coupling rates to spin and charge qubits. However, fully exploiting the potential of disordered or granular superconductors is challenging, as their inductance and, therefore, impedance at high values are difficult to control. Here, we report a reproducible fabrication of granular aluminium resonators by developing a wireless ohmmeter, which allows in situ measurements during film deposition and, therefore, control of the kinetic inductance of granular aluminium films. Reproducible fabrication of circuits with impedances (inductances) exceeding 13 k<i>Ω</i> (1 nH per square) is now possible. By integrating a 7.9 k<i>Ω</i> resonator with a germanium double quantum dot, we demonstrate strong charge-photon coupling with a rate of <i>g</i><sub>c</sub>/2<i>π</i>&#xa0;=&#xa0;566&#xa0;±&#xa0;2 MHz. This broadly applicable method opens the path for novel qubits and high-fidelity, long-distance two-qubit gates.</p>

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Strong charge-photon coupling in planar germanium enabled by granular aluminium superinductors

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月1日

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  • Marián Janík,
  • Kevin Roux,
  • Carla Borja-Espinosa,
  • Oliver Sagi,
  • Abdulhamid Baghdadi,
  • Thomas Adletzberger,
  • Stefano Calcaterra,
  • Marc Botifoll,
  • Alba Garzón Manjón,
  • Jordi Arbiol,
  • Daniel Chrastina,
  • Giovanni Isella,
  • Ioan M. Pop,
  • Georgios Katsaros

摘要

High kinetic inductance superconductors are gaining increasing interest for the realisation of qubits, amplifiers and detectors. Moreover, thanks to their high impedance, quantum buses made of such materials enable large zero-point fluctuations of the voltage, boosting the coupling rates to spin and charge qubits. However, fully exploiting the potential of disordered or granular superconductors is challenging, as their inductance and, therefore, impedance at high values are difficult to control. Here, we report a reproducible fabrication of granular aluminium resonators by developing a wireless ohmmeter, which allows in situ measurements during film deposition and, therefore, control of the kinetic inductance of granular aluminium films. Reproducible fabrication of circuits with impedances (inductances) exceeding 13 kΩ (1 nH per square) is now possible. By integrating a 7.9 kΩ resonator with a germanium double quantum dot, we demonstrate strong charge-photon coupling with a rate of gc/2π = 566 ± 2 MHz. This broadly applicable method opens the path for novel qubits and high-fidelity, long-distance two-qubit gates.