Effect of Static Disorder in an Electron Fabry-Perot Interferometer with Two Quantum Scattering Centers

TL;DR

This paper investigates how static disorder in exchange coupling constants affects electron transmission and entanglement control in a 1D wire with two quantum impurities, showing robustness of the entanglement-based transmission scheme.

Contribution

It extends previous work by analyzing the impact of disorder on entanglement effects in electron transport through quantum impurities.

Findings

Robustness of entanglement-dependent transmission against impurity disorder

Maintenance of maximally entangled state generation despite static disorder

Minimal impact of coupling variation on transmission properties

Abstract

In a recent paper -- F. Ciccarello \emph{et al.}, New J. Phys. \textbf{8}, 214 (2006) -- we have demonstrated that the electron transmission properties of a one-dimensional (1D) wire with two identical embedded spin-1/2 impurities can be significantly affected by entanglement between the spins of the scattering centers. Such effect is of particular interest in the control of transmission of quantum information in nanostructures and can be used as a detection scheme of maximally entangled states of two localized spins. In this letter, we relax the constraint that the two magnetic impurities are equal and investigate how the main results presented in the above paper are affected by a static disorder in the exchange coupling constants of the impurities. Good robustness against deviation from impurity symmetry is found for both the entanglement dependent transmission and the maximally entangled states generation scheme.