Voltage-controlled coded qubit based on electron spin

TL;DR

This paper proposes a solid-state electron spin qubit controlled electrically via a three-dot quantum dot system, enabling manipulation of quantum states through voltage tuning of electron interactions.

Contribution

It introduces a novel voltage-controlled coded qubit design based on three-electron complexes in quantum dots, with detailed analysis of state manipulation.

Findings

Voltage control enables qubit state manipulation.

Electron-electron interactions translate voltage changes into energy state adjustments.

Logical qubit states are encoded in a degenerate spin subspace.

Abstract

We design and analyze a solid state qubit based on electron spin and controlled by electrical means. The coded qubit is composed of a three-electron complex in three tunable gated quantum dots. The two logical states of a qubit, |0L> and |1L>, reside in a degenerate subspace of total spin S=1/2 states. We demonstrate how applying voltages to specific gates changes the one-electron properties of the structure, and show how electron-electron interaction translates these changes into the manipulation of the two lowest energy states of the three-electron complex.