High-fidelity Pulsed Electron Spin Resonance with High-Sensitivity... - Troy Borneman

High-fidelity Pulsed Electron Spin Resonance with High-Sensitivity Superconducting Resonators Recorded from IQC's NanoMRI conference 2015. Recent advancements in the fabrication of superconducting devices, primarily driven by efforts to implement solid-state quantum information processors, has renewed interest in using superconducting resonators for pulsed electron spin resonance spectroscopy. Superconducting resonators offer enhanced measurement sensitivity by enabling high quality factors and small mode volumes. We present a variety of novel superconducting resonators and devices that exhibit small mode volumes (~100 um^3), high quality factor (~10^4 – 10^5), and excellent microwave homogeneity over planar 2D and small 3D samples. Additionally, we discuss the development of high-fidelity control sequences that account for the unique microwave waveform distortions present in such superconducting devices. The control sequences are optimized by including a circuit model of the resonator transient response and ringdown suppression in standard optimal control theory algorithm to directly optimize pulse superoperators without any form of predistortion. In this way, non-invertible hardware distortions, including kinetic inductance non-linearity, are accounted for.