# Measuring the Berry Phase in a Superconducting Phase Qubit by a Shortcut to Adiabaticity

## TL;DR

This paper demonstrates a fast method to measure the Berry phase in a superconducting qubit using a shortcut to adiabaticity, verifying the phase through trajectory analysis and noise robustness.

## Contribution

It introduces a shortcut to adiabaticity protocol for efficient Berry phase measurement in superconducting qubits, with experimental validation and noise analysis.

## Key findings

- Berry phase measured accurately in short time
- Trajectory verification via solid angle
- Robustness of phase under amplitude noise

## Abstract

With a counter-diabatic field supplemented to the reference control field, the `shortcut to adiabaticiy' (STA) protocol is implemented in a superconducting phase qubit. The Berry phase measured in a short time scale is in good agreement with the theoretical result acquired from an adiabatic loop. The trajectory of a qubit vector is extracted, verifying the Berry phase alternatively by the integrated solid angle. The classical noise is introduced to the amplitude or phase of the total control field. In the statistics of the Berry phase, the mean with either noise is almost equal to that without noise, while the variation with the amplitude noise can be described by an analytical expression.