Metrology to Enable Higher Temperature/Frequency Qubits

Typical quantum information systems using superconducting qubits operate in the (4-8) GHz frequency range and at temperatures below 50 mK. Operating superconducting qubits at temperatures above ~0.5 K is a likely essential requirement in order to scale system sizes to larger and larger numbers of qubits. To operate at higher temperatures and remain above the thermal background, qubits must operate at higher frequencies where the appropriate materials, designs, and metrology need to be developed and characterized. In this presentation, we discuss the measurement science tools we are developing and plan to use to quantify sources of loss and decoherence in resonators and qubits at frequencies above ten gigahertz. Specifically, we demonstrate cryogenic high-Q resonators, parametric amplifiers, and harmonic generating devices using kinetic inductance and present our measured characterizations of these devices up to 30 GHz freq and 0.5 K temperature.