Entangling photons using a charged quantum dot in a microcavity

TL;DR

This paper introduces two deterministic methods for generating photon polarization entanglement using single electron spins in charged quantum dots within microcavities, enabling scalable multi-photon entanglement and a photon-spin interface.

Contribution

The paper proposes two novel, deterministic schemes for photon entanglement using quantum dots in microcavities, leveraging giant birefringence and Faraday rotation, and introduces a photon-spin quantum interface.

Findings

Schemes are deterministic and scalable for multi-photon entanglement.

Utilizes giant circular birefringence and Faraday rotation induced by a single electron spin.

Proposes a quantum interface between photons and spins.

Abstract

We present two novel schemes to generate photon polarization entanglement via single electron spins confined in charged quantum dots inside microcavities. One scheme is via entangled remote electron spins followed by negatively-charged exciton emissions, and another scheme is via a single electron spin followed by the spin state measurement. Both schemes are based on giant circular birefringence and giant Faraday rotation induced by a single electron spin in a microcavity. Our schemes are deterministic and can generate an arbitrary amount of multi-photon entanglement. Following similar procedures, a scheme for a photon-spin quantum interface is proposed.