Towards Quantum Repeaters with Solid-State Qubits: Spin-Photon Entanglement Generation using Self-Assembled Quantum Dots

TL;DR

This paper reviews recent advances in using InAs quantum dots for spin-photon entanglement, a crucial step towards developing quantum repeaters for long-distance quantum communication.

Contribution

It highlights experimental demonstrations of entanglement between quantum dot-based quantum memories and photonic qubits, advancing the development of solid-state quantum repeaters.

Findings

Demonstrated entanglement between electron spin qubits and photonic qubits in quantum dots

Reviewed the potential of quantum dots for scalable quantum repeater architectures

Outlined challenges and future directions for implementing quantum repeaters

Abstract

In this chapter we review the use of spins in optically-active InAs quantum dots as the key physical building block for constructing a quantum repeater, with a particular focus on recent results demonstrating entanglement between a quantum memory (electron spin qubit) and a flying qubit (polarization- or frequency-encoded photonic qubit). This is a first step towards demonstrating entanglement between distant quantum memories (realized with quantum dots), which in turn is a milestone in the roadmap for building a functional quantum repeater. We also place this experimental work in context by providing an overview of quantum repeaters, their potential uses, and the challenges in implementing them.