Superconducting resonators with voltage-controlled frequency and nonlinearity

• URL: http://arxiv.org/abs/2210.02491v2
• Date: Sun, 25 Dec 2022 23:15:05 GMT
• Title: Superconducting resonators with voltage-controlled frequency and nonlinearity
• Authors: William M. Strickland, Bassel Heiba Elfeky, Joseph O'Connell Yuan, William F. Schiela, Peng Yu, Dylan Langone, Maxim G. Vavilov, Vladimir E. Manucharyan and Javad Shabani
• Abstract summary: Voltage-tunable superconductor-semiconductor devices offer a unique platform to realize dynamic tunability in quantum circuits. 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.
• Score: 0.7812194618516135
• License: http://creativecommons.org/licenses/by/4.0/
• 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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