发表机构
The Physics Department and the Solid State Institute, Technion-Israel Institute of Technology; Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area; State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-sen University; Guangdong Technion-Israel Institute of Technology（以色列理工学院物理系与固体研究所; 粤港澳大湾区量子科学中心; 中山大学物理学院光电材料与技术国家重点实验室; 广东以色列理工学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文展示一种基于半导体量子点的器件，利用自然自旋回波概念，可在GHz速率下确定性产生超过12个光子的GHZ态，有望改进为高性能GHZ源以降低光子量子技术开销。
AI 中文摘要
量子技术在当代发展迅速，正从抽象的科学思想和基础演示过渡到具备足够质量和规模、可实现实际应用的系统。光子量子技术在这些发展中发挥关键作用，因为光子具有鲁棒性、易操控、可探测和测量的特性，符合量子信息的飞行载体及纠缠分发器的要求。光子量子技术的发展得益于经典光学技术的成熟，已有研究表明，即使是一个可预告的三纠缠光子源，也足以利用其他经典光学元件构建大规模量子计算机。本文展示了一种新型基于半导体量子点的器件，其可在GHz速率下确定性产生超过12个光子的、鲁棒的Greenberger-Horne-Zeilinger（GHZ）态的不可区分单光子。该器件利用了新型自然自旋回波概念，该概念源于周期性激发的量子点在激发态和基态中，负、正载流子自旋分别具有相反的进动方向。激发速率经过精细调谐，以抵消两种自旋进动产生的相位。我们的创纪录长GHZ态产生器件仍可切实改进，以提供更高速率、更亮且更鲁棒的确定性GHZ源，显著降低光子量子技术的开销需求。
英文摘要
Quantum technologies witness rapid contemporary developments transitioning from abstract scientific ideas and fundamental demonstrations, into systems of sufficient quality and scale, enabling real applications. Photonic quantum technologies are playing a pivotal role in these developments, since photons are robust, easily controlled, detect and measured, thus qualify as flying carriers of quantum information and entanglement distributers. The efforts to develop photonic quantum technologies benefit from the maturity of the classical optical technologies. It was shown that even a source of heralded three entangled photons is sufficient for building large scale quantum computers using otherwise classical optical elements. Here, we demonstrate a novel semiconductor quantum dot based device, which deterministically generate at GHz rates, indistinguishable single photons in a robust Greenberger-Horne-Zeilinger (GHZ) state of more than a dozen photons. The device utilizes novel natural spin echo concept, provided by the opposite precession directions of the negative and positive carriers' spins in the excited and ground levels of the periodically excited dot, respectively. The excitation rate is finely tuned to nullify the phase acquired by both spins' precession. Our record long GHZ state producing device can yet be feasibly improved to provide higher-rate, brighter and more robust deterministic GHZ source, significantly reducing the overhead requirements for photonic quantum technologies.
Comments8 pages, 4 figures
