Dynamic generation of GHZ states with coupled charge qubits

Abstract

In this paper, we present a proof-of-principle of the formation of pure maximally entangled states from the Greenberger-Horne-Zeilinger class for three-qubits, in the experimental context of charged quantum dots. Each qubit must be identified as a pair of quantum dots coupled through a tunneling parameter, that allows electron tunneling between the dots. The Coulomb interaction is accounted for and is responsible for the coupling between the qubits. The interplay between coherent tunneling events and many-body interaction gives rise to the formation of highly entangled states. An effective model sheds light on the role of a third-order tunneling process behind the dynamics, and the action of charge dephasing is quantified in the process.