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Superconducting resonators with voltage-controlled frequency and nonlinearity

William M. StricklandBassel Heiba ElfekyJoseph O'Connell Yuan ...+5 Javad Shabani
Oct 2022
摘要
Voltage-tunable superconductor-semiconductor devices offer a unique platformto realize dynamic tunability in superconducting quantum circuits. Bygalvanically connecting a gated InAs-Al Josephson junction to a coplanarwaveguide resonator, we demonstrate the use of a wide-range gate-tunablesuperconducting element. We show that the resonant frequency is controlled viaa gate-tunable Josephson inductance and that the non-linearity of thevoltage-controlled InAs-Al junction is non-dissipative as is the case withconventional Al-AlO$_{x}$ junctions. As the gate voltage is decreased, theinductive participation of the junction increases up to $44\%$, resulting inthe resonant frequency being tuned by over 2 GHz. Utilizing the wide tunabilityof the device, we demonstrate that two resonant modes can be adjusted such thatthey strongly hybridize, exhibiting an avoided level crossing with a couplingstrength of 51 MHz. Implementing such voltage-tunable resonators is the firststep toward realizing wafer-scale continuous voltage control in superconductingcircuits for qubit-qubit coupling, quantum-limited amplifiers, and quantummemory platforms.
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