Entanglement and transport anomalies in nanowires

TL;DR

This paper explores how a shallow potential well in quantum wires can create entanglement between static and flying spin-qubits and explains conductance anomalies through pairwise scattering and many-body effects.

Contribution

It demonstrates the use of Coulomb and Pauli effects in quantum wires to generate entanglement and explains transport anomalies without Kondo effects.

Findings

Entanglement between static and flying spin-qubits is achievable near resonance.

Transport anomalies can be explained by pairwise scattering in many-electron wires.

Kondo-like effects are negligible at sufficiently high temperatures.

Abstract

A shallow potential well in a near-perfect quantum wire will bind a single-electron and behave like a quantum dot, giving rise to spin-dependent resonances of propagating electrons due to Coulomb repulsion and Pauli blocking. It is shown how this may be used to generate full entanglement between static and flying spin-qubits near resonance in a two-electron system via singlet or triplet spin-filtering. In a quantum wire with many electrons, the same pairwise scattering may be used to explain conductance, thermopower and shot-noise anomalies, provided the temperature/energy scale is sufficiently high for Kondo-like many-body effects to be negligible.