Quantum entanglement driven by electron-vibrational mode coupling

TL;DR

This paper demonstrates a method to generate maximally entangled states in quantum dots by leveraging electron-vibrational mode coupling, revealing a non-monotonic interaction effect that enhances entanglement.

Contribution

It introduces a novel approach to produce entangled states using vibrational mode coupling in quantum dots, with a detailed analysis of the underlying effective Hamiltonian.

Findings

Efficient production of maximally entangled states demonstrated.

Electron-vibrational coupling induces effective electron-electron interactions.

Non-monotonic behavior of entanglement related to vibrational mode coupling.

Abstract

In this work, we provided a proof-of-principle of efficient production of maximally entangled states using charged quantum dots coupled to vibrational modes. The physical system consists of two pairs of quantum dots, each pair with a single electron able to tunnel between the dots, thus encoding a qubit. The electrons, initially not coupled, interact with two bosonic vibrational modes. It is demonstrated that the electron-vibrational mode coupling drives to an effective electron-electron interaction, which is the main mechanism behind the formation of maximally quantum entangled electronic states. The effect of this coupling follows a non-monotonic behavior, which is explained through an effective hamiltonian which takes into account high order transition processes.