Gate-tunable kinetic inductance parametric amplifier
Lukas Johannes Splitthoff, Jaap J. Wesdorp, Marta Pita‐Vidal, Arno Bargerbos, Yu Liu, Christian Kraglund Andersen
Abstract
Reading out the state of a quantum system at low temperature is generally challenging, as weak quantum signals must be amplified while adding as little noise as possible. Also, some qubit types rely on external magnetic fields and require magnetic-field-compatible superconducting parametric amplifiers. Here an innovative amp design leverages the nonlinear response of the gate-tunable kinetic inductance of proximitized semiconducting nanowires. The tunability allows integration with superconducting quantum systems, thanks to minimal crosstalk, and this amp can work with semiconductor-based spin qubits and other hybrid systems in magnetic fields of 500 mT.