Bell states and entanglement dynamics on two coupled quantum molecules

TL;DR

This paper analyzes entanglement in coupled quantum molecules, showing Bell states as a natural basis, exploring eigenstate properties, and detailing how to generate highly entangled states through system dynamics.

Contribution

It provides a complete description of entanglement properties and dynamics in coupled quantum molecules, highlighting Bell states as a natural basis and conditions for high entanglement.

Findings

Bell states form a natural basis for the system

Eigenstates' entanglement depends on physical parameters

High entanglement states can be generated through coherent oscillations

Abstract

This work provides a complete description of entanglement properties between electrons inside coupled quantum molecules, nanoestructures which consist of two quantum dots. Each electron can tunnel between the two quantum dots inside the molecule, being also coupled by Coulomb interaction. First, it is shown that Bell states act as a natural basis for the description of this physical system, defining the characteristics of the energy spectrum and the eigenstates. Then, the entanglement properties of the eigenstates are discussed, shedding light on the roles of each physical parameters on experimental setup. Finally, a detailed analysis of the dynamics shows the path to generate states with a high degree of entanglement, as well as physical conditions associated with coherent oscillations between separable and Bell states.