Towards quantum optics and entanglement with electron spin ensembles in semiconductors

TL;DR

This paper presents a method to generate and control quantum entanglement between electron spin ensembles in semiconductors using optical techniques, enabling advances in quantum information processing.

Contribution

It introduces a novel approach utilizing GaAs quantum wells in optical waveguides to achieve controlled entanglement of electron spin-wave modes.

Findings

Demonstrates entanglement of spin-wave modes via optical measurement

Uses quantum Hall states for selective addressing of electron spins

Achieves long-lived superpositions of electron spin states

Abstract

We discuss a technique and a material system that enable the controlled realization of quantum entanglement between spin-wave modes of electron ensembles in two spatially separated pieces of semiconductor material. The approach uses electron ensembles in GaAs quantum wells that are located inside optical waveguides. Bringing the electron ensembles in a quantum Hall state gives selection rules for optical transitions across the gap that can selectively address the two electron spin states. Long-lived superpositions of these electron spin states can then be controlled with a pair of optical fields that form a resonant Raman system. Entangled states of spin-wave modes are prepared by applying quantum-optical measurement techniques to optical signal pulses that result from Raman transitions in the electron ensembles.