Gate fidelity comparison in semiconducting spin qubit implementations affected by control noises

TL;DR

This paper compares the gate fidelities of five different semiconducting spin qubit types in quantum dots and donors, analyzing how control noise affects their performance using analytical sequences and realistic error models.

Contribution

It introduces analytical time sequences for single-qubit rotations across five qubit types and compares their gate fidelities under control noise, providing a comprehensive performance assessment.

Findings

Quantum dot spin qubit shows higher fidelity under certain control errors.

Double quantum dot singlet-triplet qubit is more sensitive to pulse timing errors.

Donor qubit exhibits robustness against amplitude control noise.

Abstract

A comparison of gate fidelities between different spin qubit types defined in quantum dots and a donor under different control errors is reported. We studied five qubit types, namely the quantum dot spin qubit, the double quantum dot singlet-triplet qubit, the double quantum dot hybrid qubit, the donor qubit and the quantum dot spin-donor qubit. For each one, we derived analytical time sequences that realize single qubit rotations along the principal axis of the Bloch sphere. We estimated the effects of control errors on the gate fidelity by using a Gaussian noise model. Then we compared the gate fidelities among qubit implementations due to pulse timing errors by using a realistic set of values for the error parameters of control amplitudes.