Superconducting resonators with voltage-controlled frequency and nonlinearity

Abstract

Voltage-tunable superconductor-semiconductor devices offer a unique platform to realize dynamic tunability in superconducting quantum circuits. By galvanically connecting a gated InAs-Al Josephson junction to a coplanar waveguide resonator, we demonstrate the use of a wide-range gate-tunable superconducting element. We show that the resonant frequency is controlled via a gate-tunable Josephson inductance and that the non-linearity of the voltage-controlled InAs-Al junction is non-dissipative as is the case with conventional Al-AlO${}_x$ junctions. As the gate voltage is decreased, the inductive participation of the junction increases up to $44\%$, resulting in the resonant frequency being tuned by over 2 GHz. Utilizing the wide tunability of the device, we demonstrate that two resonant modes can be adjusted such that they strongly hybridize, exhibiting an avoided level crossing with a coupling strength of 51 MHz. Implementing such voltage-tunable resonators is the first step toward realizing wafer-scale continuous voltage control in superconducting circuits for qubit-qubit coupling, quantum-limited amplifiers, and quantum memory platforms.

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Cited by in corpus (22)

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• Superconducting surface trap chips for microwave-driven trapped ions
• Detector of microwave photon pairs based on a Josephson photomultiplier
• Tunable superconducting resonators via on-chip control of local magnetic field
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• Determination of the current-phase relation of an InAs 2DEG Josephson junction with a microwave resonator
• On-Chip Resonator for Nonlinear Kinetic Inductance Characterisation and Future Spectrometry Applications