Pulse calibration and non-adiabatic control of solid-state artificial atoms

TL;DR

This paper demonstrates precise pulse calibration and non-adiabatic control of a superconducting artificial atom by engineering the driving waveform, enabling accurate manipulation of quantum states.

Contribution

It introduces a method to map and engineer the waveform at the device using bi-harmonic signals, improving control over artificial atoms.

Findings

Successful waveform imaging at the device

Enhanced control of quantum state transitions

Agreement between experimental data and simulations

Abstract

Transitions in an artificial atom, driven non-adiabatically through an energy-level avoided crossing, can be controlled by carefully engineering the driving protocol. We have driven a superconducting persistent-current qubit with a large-amplitude, radio-frequency field. By applying a bi-harmonic waveform generated by a digital source, we demonstrate a mapping between the amplitude and phase of the harmonics produced at the source and those received by the device. This allows us to image the actual waveform at the device. This information is used to engineer a desired time dependence, as confirmed by detailed comparison with simulation.