Quantum Computation with Quantum Dots

TL;DR

This paper proposes a method for quantum computation using spin states in coupled quantum dots, detailing gate implementation, analyzing decoherence effects, and suggesting experimental demonstrations.

Contribution

It introduces a new approach for universal quantum gates with quantum dots, including a spin master equation for decoherence analysis and experimental proposals.

Findings

Derived a spin master equation incorporating magnetic decoherence.

Analyzed gate quality measures under realistic conditions.

Proposed initial experiments for non-equilibrium spin dynamics.

Abstract

We propose a new implementation of a universal set of one- and two-qubit gates for quantum computation using the spin states of coupled single-electron quantum dots. Desired operations are effected by the gating of the tunneling barrier between neighboring dots. Several measures of the gate quality are computed within a newly derived spin master equation incorporating decoherence caused by a prototypical magnetic environment. Dot-array experiments which would provide an initial demonstration of the desired non-equilibrium spin dynamics are proposed.