Entanglement properties of a quantum-dot biexciton cascade in a chiral nanophotonic waveguide

TL;DR

This paper investigates how a quantum-dot biexciton cascade coupled to a chiral nanophotonic waveguide can generate entangled photon pairs, analyzing the effects of experimental imperfections on entanglement quality.

Contribution

It models the entanglement generation process considering realistic imperfections, demonstrating the potential of integrated nanophotonic systems for deterministic entanglement.

Findings

Entanglement remains robust despite imperfections.

Chiral waveguide coupling enhances entanglement.

Realistic models predict feasible experimental implementation.

Abstract

We analyse the entanglement properties of deterministic path-entangled photonic states generated by coupling the emission of a quantum-dot biexciton cascade to a chiral nanophotonic waveguide, as implemented by {\O}stfeldt et al. [PRX Quantum 3, 020363 (2022)]. We model the degree of entanglement through the concurrence of the two-photon entangled state in the presence of realistic experimental imperfections. The model accounts for imperfect chiral emitter-photon interactions in the waveguide and the asymmetric coupling of the exciton levels introduced by fine-structure splitting along with time-jitter in the detection of photons. The analysis shows that the approach offers a promising platform for deterministically generating entanglement in integrated nanophotonic systems in the presence of realistic experimental imperfections.