Entanglement between static and flying qubits in quantum wires

TL;DR

This paper demonstrates that a weakly bound electron in a quantum wire can become entangled with a traveling electron through Coulomb interaction, with tunable entanglement based on energy, spin, and momentum.

Contribution

It introduces a method to generate and control entanglement between static and flying qubits in quantum wires using Coulomb interactions.

Findings

Maximum entanglement occurs near spin-dependent resonances.

Entanglement can be tuned by initial electron energy, spin, and momentum.

Potential device structures for realizing this entanglement are discussed.

Abstract

A weakly bound electron in a semiconductor quantum wire is shown to become entangled with an itinerant electron via the coulomb interaction. The degree of entanglement and its variation with energy of the injected electron, may be tuned by choice of spin and initial momentum. Full entanglement is achieved close to energies where there are spin-dependent resonances. Possible realisations of related device structures are discussed.