Shortcuts to Adiabaticity for Fast Qubit Readout in Circuit Quantum Electrodynamics

TL;DR

This paper introduces engineered shortcuts to adiabaticity for rapid qubit measurement in circuit QED, significantly improving signal-to-noise ratio and measurement speed through inverse engineering and counter-diabatic methods.

Contribution

It develops novel modulation protocols based on inverse engineering and counter-diabatic driving to enhance qubit readout speed and fidelity in circuit QED systems.

Findings

Protocols outperform traditional periodic modulations in SNR and pointer state separation

Achieves nanosecond-scale measurement times with improved accuracy

Proposes practical implementation in current circuit QED architectures

Abstract

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.