Achieving High-Fidelity Single-Qubit Gates in a Strongly Driven Charge Qubit with $1\!/\!f$ Charge Noise

TL;DR

This paper develops analytical methods to improve single-qubit gate fidelities in charge qubits affected by $1/f$ charge noise, achieving over 99.9% fidelity through specialized pulsing techniques, advancing quantum dot qubit performance.

Contribution

It introduces analytical techniques for strongly driven charge qubits with $1/f$ noise and demonstrates high-fidelity gate implementation using error-suppressing pulse sequences.

Findings

Achieved single-qubit gate fidelities above 99.9%.

Developed analytical models for strongly driven charge qubits with $1/f$ noise.

Identified pulsing strategies to suppress errors from strong driving and charge noise.

Abstract

Charge qubits formed in double quantum dots represent quintessential two-level systems that enjoy both ease of control and efficient readout. Unfortunately, charge noise can cause rapid decoherence, with typical single-qubit gate fidelities falling below $90\%$. Here, we develop analytical methods to study the evolution of strongly driven charge qubits, for general and $1\!/\!f$ charge-noise spectra. We show that special pulsing techniques can simultaneously suppress errors due to strong driving and charge noise, yielding single-qubit gates with fidelities above $99.9\%$. These results demonstrate that quantum dot charge qubits provide a potential route to high-fidelity quantum computation.