High-impedance superconducting resonator for the dispersive readout of a nanomechanical qubit

Abstract

Mechanical resonators are good candidates for processing quantum information. In particular, the development of a nanomechanical qubit with a larger coherence time than other solid-state qubit architectures can pave the way towards the creation of novel quantum devices. To access the qubit state, we design and characterize a high-impedance superconducting resonator in a separate chip with a resonant frequency of 2-9 GHz and internal quality factors of Qi ≥ 103 , including the losses added by the use of wirebonds. This type of resonator can be used to couple to other hybrid systems that are not compatible with conventional fabrication of superconducting circuits.