Noise-resistant control for a spin qubit array

TL;DR

This paper introduces a systematic method for implementing noise-resistant gate operations on an array of exchange-coupled singlet-triplet qubits, addressing nuclear and charge noise to enable scalable quantum computing.

Contribution

It presents simple, short control sequences for corrected single-qubit and CNOT gates, advancing error reduction in semiconductor-based quantum architectures.

Findings

Control sequences effectively mitigate nuclear and charge noise.

Enables error rates below quantum error correction thresholds.

Facilitates scalable quantum computation with improved gate fidelity.

Abstract

We develop a systematic method of performing corrected gate operations on an array of exchange-coupled singlet-triplet qubits in the presence of both fluctuating nuclear Overhauser field gradients and charge noise. The single-qubit control sequences we present have a simple form, are relatively short, and form the building blocks of a corrected CNOT gate when also implemented on the inter-qubit exchange link. This is a key step towards enabling large-scale quantum computation in a semiconductor-based architecture by facilitating error reduction below the quantum error correction threshold for both single-qubit and multi-qubit gate operations.