Near-deterministic hybrid generation of arbitrary photonic graph states using a single quantum emitter and linear optics

TL;DR

This paper presents a near-deterministic method for generating complex photonic graph states by combining quantum emitters with linear optics, advancing towards practical quantum computing and communication.

Contribution

It introduces a hybrid approach that combines quantum emitter-based generation with all-photonic fusion gates to produce complex graph states near-deterministically.

Findings

Proposes hybrid generation method using current quantum emitter capabilities.

Achieves near-deterministic production of complex photonic graph states.

Facilitates practical implementation of measurement-based quantum information processing.

Abstract

Since linear-optical two-photon gates are inherently probabilistic, measurement-based implementations are particularly well suited for photonic platforms: a large highly-entangled photonic resource state, called a graph state, is consumed through measurements to perform a computation. The challenge is thus to produce these graph states. Several generation procedures, which use either interacting quantum emitters or efficient spin-photon interface, have been proposed to create these photonic graph states deterministically. Yet, these solutions are still out of reach experimentally since the state-of-the-art is the generation of a linear graph state. Here, we introduce near-deterministic solutions for the generation of graph states using the current quantum emitter capabilities. We propose hybridizing quantum-emitter-based graph state generation with all-photonic fusion gates to produce graph states of complex topology near-deterministically. Our results should pave the way towards the practical implementation of resource-efficient quantum information processing, including measurement-based quantum communication and quantum computing.