Tomography of the two-electron spin qubits in semiconductors

TL;DR

This paper introduces a tomography method for two-electron spin qubits in semiconductor quantum dots, enabling complete state reconstruction using fast gates and nuclear polarization, crucial for quantum computing.

Contribution

It presents a novel tomography approach combining spin gates and nuclear polarization for full qubit state characterization in solid-state systems.

Findings

Enables complete two-electron spin qubit state reconstruction.

Utilizes dynamical nuclear polarization to enhance measurement accuracy.

Applicable for solid-state quantum computing implementations.

Abstract

We propose an approach to reconstruct two-electron spin qubit states in semiconductor quantum dots by employing tomographic techniques. This procedure exploits the combination of fast gate operations on electron spins trapped in dots and dynamical nuclear polarization of the underlying Ga and As nuclei. The presented method can be an important tool in solid state quantum computation for complete characterization of qubit states and theirs correlations.