Deterministic generation of large-scale entangled photonic cluster state from interacting solid state emitters

TL;DR

This paper presents a method to deterministically generate large-scale entangled photonic cluster states using solid state quantum emitters, leveraging exchange interactions and single-qubit operations, suitable for quantum computing.

Contribution

It introduces a novel approach for creating multi-photon entanglement without two-qubit gates, using always-on exchange interactions in solid state emitters.

Findings

Deterministic generation of large entangled photonic cluster states demonstrated.

Method works with non-identical emitters and no two-qubit gates needed.

Compatible with current quantum dot experimental setups.

Abstract

The ability to create large highly entangled `cluster' states is crucial for measurement-based quantum computing. We show that deterministic multi-photon entanglement can be created from coupled solid state quantum emitters without the need for any two-qubit gates and regardless of whether the emitters are identical. In particular, we present a general method for controlled entanglement creation by making direct use of the always-on exchange interaction, in combination with single-qubit operations. This is used to provide a recipe for the generation of two-dimensional, cluster-state entangled photons that can be carried out with existing experimental capabilities in quantum dots.