Eliminating temporal correlation in quantum-dot entangled photon source by quantum interference

TL;DR

This paper demonstrates a method using quantum interference to eliminate temporal correlation in quantum-dot photon sources, significantly enhancing multi-photon entanglement fidelity and advancing scalable quantum information processing.

Contribution

It introduces a novel quantum interference technique to decouple polarization entanglement from temporal correlation in quantum dots, improving entanglement fidelity.

Findings

Multi-photon entanglement fidelity increased from 58.7% to 75.5%.

Method enables scalable, high-quality multi-photon state generation.

Decoupling polarization entanglement from temporal correlation enhances quantum dot performance.

Abstract

Semiconductor quantum dots, as promising solid-state platform, have exhibited deterministic photon pair generation with high polarization entanglement f\textcompwordmark idelity for quantum information applications. However, due to temporal correlation from inherently cascaded emission, photon indistinguishability is limited, which restricts their potential scalability to multi-photon experiments. Here, by utilizing quantum interferences to decouple polarization entanglement from temporal correlation, we improve multi-photon entanglement f\textcompwordmark idelity from $(58.7\pm 2.2)\%$ to $(75.5\pm 2.0)\%$. Our work paves the way to realize scalable and high-quality multi-photon states from quantum dots.