Quantum-dot spin qubit and hyperfine interaction

TL;DR

This paper reviews the spin dynamics of two electrons in a double quantum dot influenced by hyperfine interactions and proposes a scheme to reduce decoherence by narrowing nuclear polarization differences.

Contribution

It introduces a novel scheme to suppress hyperfine-induced decoherence by narrowing nuclear polarization differences in double quantum dots.

Findings

Analysis of spin dynamics under hyperfine interaction

Proposal of a polarization narrowing scheme to improve coherence

Potential reduction in decoherence effects in quantum dot qubits

Abstract

We review our investigation of the spin dynamics for two electrons confined to a double quantum dot under the influence of the hyperfine interaction between the electron spins and the surrounding nuclei. Further we propose a scheme to narrow the distribution of difference in polarization between the two dots in order to suppress hyperfine induced decoherence.