Entangled microwave photons from quantum dots

TL;DR

This paper proposes a novel method to generate polarization-entangled microwave photons using quantum dots' orbital states, avoiding spin-orbit coupling or electron interaction control, with calculations showing maximal entanglement under certain conditions.

Contribution

It introduces a new mechanism for microwave entanglement via intra-band transitions in quantum dots, leveraging orbital degrees of freedom and magnetic fields, without relying on spin-orbit effects.

Findings

Maximal entanglement achieved with weak inter-dot coupling

Concurrence of photon pairs calculated and optimized

Method does not depend on spin-orbit coupling or electron interactions

Abstract

We describe a mechanism for the production of polarisation-entangled microwaves using intra-band transitions in a pair of quantum dots. This proposal relies neither on spin-orbit coupling nor on control over electron-electron interactions. The quantum correlation of microwave polarisations is obtained from orbital degrees of freedom in an external magnetic field. We calculate the concurrence of emitted microwave photon pairs, and show that a maximally entangled Bell pair is obtained in the limit of weak inter-dot coupling.