Entanglement and transport anomalies in nanowires

Abstract

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