We propose how to engineer the longitudinal coupling to accelerate the measurement of a qubit longitudinally coupled to a cavity, motivated by the concept of shortcuts to adiabaticity. Different modulations are inversely designed from two methods of inverse engineering and counter-diabatic driving, for achieving larger values of the signal-to-noise ratio (SNR) at nanosecond scale. By comparison, we demonstrate that our protocols outperform the usual periodic modulations on the pointer state separation and SNR. Finally, we show a possible implementation considering state-of-the-art circuit quantum electrodynamics architecture, estimating the minimal time allowed for the measurement process.
@article{arxiv.2201.06007,
title = {Shortcuts to Adiabaticity for Fast Qubit Readout in Circuit Quantum Electrodynamics},
author = {F. A. Cárdenas-López and Xi Chen},
journal= {arXiv preprint arXiv:2201.06007},
year = {2022}
}