Pseudospin and Quantum Computation in Semiconductor Nanostructures

TL;DR

This paper reviews the theoretical framework for using pseudospin states in coupled quantum dots within the quantum Hall regime for quantum computation, highlighting their robustness, control, and experimental signatures.

Contribution

It introduces a model for pseudospin qubits in coupled quantum dots and predicts an experimental signature for their realization.

Findings

Effective quantum Ising model tunable via external gates

Prediction of an even-odd Coulomb blockade spectrum effect

Analysis of robustness and addressability of charge-based qubits

Abstract

We review the theoretical aspects of pseudospin quantum computation using vertically coupled quantum dots in the quantum Hall regime. We discuss the robustness and addressability of these collective, charge-based qubits. The low energy Hilbert space of a coupled set of qubits yields an effective quantum Ising model tunable through external gates. An experimental prediction of an even-odd effect in the Coulomb blockade spectra of the coupled quantum dot system probes the parameter regime necessary for realization of these qubits.