通过量子干涉消除量子点纠缠光子源中的时间相关性。

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

机构信息

Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China; Shanghai Research Center for Quantum Science and CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China.

Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China.

出版信息

Sci Bull (Beijing). 2023 Apr 30;68(8):807-812. doi: 10.1016/j.scib.2023.03.022. Epub 2023 Mar 16.

DOI:10.1016/j.scib.2023.03.022

PMID:36990872

Abstract

Semiconductor quantum dots, as promising solid-state platform, have exhibited deterministic photon pair generation with high polarization entanglement fidelity 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 four-photon Greenberger-Horne-Zeilinger (GHZ) state entanglement fidelity from (58.7±2.2)% to (75.5±2.0)%. Our work paves the way to realize scalable and high-quality multi-photon states from quantum dots.

摘要

半导体量子点作为一种很有前途的固态平台，已经展示出具有高偏振纠缠保真度的确定性光子对产生，可用于量子信息应用。然而，由于固有级联发射的时间相关性，光子不可区分性受到限制，这限制了它们在多光子实验中的潜在可扩展性。在这里，我们利用量子干涉将偏振纠缠与时间相关性解耦，将四光子 Greenberger-Horne-Zeilinger (GHZ) 态纠缠保真度从 (58.7±2.2)%提高到 (75.5±2.0)%。我们的工作为实现可扩展和高质量的多光子量子点态铺平了道路。