Refocussing off-resonant spin-1/2 evolution using spinor behavior

TL;DR

This paper introduces a systematic method to design sequences that effectively refocus off-resonant spin-1/2 evolution, especially useful for quantum dot electron spins and similar qubit systems with control limitations.

Contribution

It presents a new systematic approach for constructing precise sequences to correct off-resonant spin evolution under limited control amplitude.

Findings

Sequences improve refocusing accuracy for off-resonant spins.

Applicable to electron spin qubits in quantum dots.

Effective under severely limited control amplitudes.

Abstract

A systematic method is presented for constructing increasingly precise sequences to refocus off-resonant spin evolution with severely limited control amplitude. Sequences obtained should be readily applicable to the case of electron spin qubits in quantum dots with random nuclear fields, and other qubit systems with systematic qubit splitting errors comparable to control field amplitude.