Protocol for generation of high-dimensional entanglement from an array of non-interacting photon emitters

TL;DR

This paper proposes a near-deterministic protocol to generate high-dimensional entangled photon states using non-interacting emitters, enhancing quantum communication robustness and efficiency.

Contribution

It introduces a novel protocol for generating high-dimensional GHZ states from non-interacting photon emitters, addressing common error sources and improving quantum key distribution performance.

Findings

High-fidelity multi-qudit GHZ states achievable with error correction

Enhanced loss tolerance in quantum key distribution with higher dimensions

Protocol is near-deterministic and scalable for quantum technologies

Abstract

Encoding high-dimensional quantum information into single photons can provide a variety of benefits for quantum technologies, such as improved noise resilience. However, the efficient generation of on-demand, high-dimensional entanglement was thought to be out of reach for current and near-future photonic quantum technologies. We present a protocol for the near-deterministic generation of $N$-photon, $d$-dimensional photonic Greenberger-Horne-Zeilinger (GHZ) states using an array of $d$ non-interacting single-photon emitters. We analyse the impact on performance of common sources of error for quantum emitters, such as photon spectral distinguishability and temporal mismatch, and find they are readily correctable with time-resolved detection to yield high fidelity GHZ states of multiple qudits. When applied to a quantum key distribution scenario, our protocol exhibits improved loss tolerance and key rates when increasing the dimensionality beyond binary encodings.