On-Chip Microwave Filters for High-Impedance Resonators with Gate-Defined Quantum Dots
Patrick Harvey-Collard, Guoji Zheng, Jurgen Dijkema, Nodar Samkharadze, Amir Sammak, Giordano Scappucci, Lieven M. K. Vandersypen
Abstract
Circuit quantum electrodynamics with qubits based on semiconductor quantum dots can enable long-range two-qubit gates between distant spins, or improve gate-based charge sensing for readout. Compared to conventional resonators, high-impedance resonators improve the coupling to the qubits, but their losses to the quantum dot's leads are also larger. This study implements on-chip filtering using high-kinetic-inductance nanowires and thin-film capacitors to mitigate this source of losses. These filters are very compact and easily extended to a large number of leads, all while preserving state-of-the-art resonator quality factors.