On the stability of quantum holonomic gates

TL;DR

This paper analyzes the stability of holonomic quantum gates under parametric noise, providing a geometric framework to identify conditions where noise effects cancel out, thus enhancing gate robustness.

Contribution

It introduces a unified geometric approach to assess holonomic gate stability against control noise, supporting previous simulations and suggesting ways to improve gate fidelity.

Findings

Noise correlation time and strength affect gate stability

Certain noise conditions lead to cancellation of fluctuations

Increasing adiabatic time reduces timing mismatch errors

Abstract

We provide a unified geometrical description for analyzing the stability of holonomic quantum gates in the presence of imprecise driving controls (parametric noise). We consider the situation in which these fluctuations do not affect the adiabatic evolution but can reduce the logical gate performance. Using the intrinsic geometric properties of the holonomic gates, we show under which conditions on noise's correlation time and strength, the fluctuations in the driving field cancel out. In this way, we provide theoretical support to previous numerical simulations. We also briefly comment on the error due to the mismatch between real and nominal time of the period of the driving fields and show that it can be reduced by suitably increasing the adiabatic time.