Entangled Bell and GHZ states of excitons in coupled quantum dots

TL;DR

This paper demonstrates how excitons in coupled quantum dots can be optically controlled to reliably generate Bell and GHZ entangled states, with analysis of pulse parameters and experimental feasibility.

Contribution

It introduces a method for creating Bell and GHZ states in quantum dots using optical control, combining analytic and numerical solutions for optimal pulse parameters.

Findings

Optical pulses can generate Bell and GHZ states in quantum dots.

Analytic and numerical methods identify optimal pulse parameters.

Discussion of experimental requirements for state preparation.

Abstract

We show that excitons in coupled quantum dots are ideal candidates for reliable preparation of entangled states in solid-state systems. An optically controlled exciton transfer process is shown to lead to the generation of Bell and GHZ states in systems comprising two and three coupled dots, respectively. The strength and duration of selective light-pulses for producing maximally entangled states are identified by both analytic, and full numerical, solution of the quantum dynamical equations. Experimental requirements to build such entangled states are discussed.