论文标题
基于腔体增强和应变的GAAS量子点的纠缠光子源
A source of entangled photons based on a cavity-enhanced and strain-tuned GaAs quantum dot
论文作者
论文摘要
提供具有高亮度和高度纠缠的光子的量子光源对于开发有效的基于纠缠的量子键分配系统至关重要。在所有可能的候选者中，外延量子点目前正在成为高度纠缠的光子中最亮的来源之一。但是，亮度和纠缠的优化目前需要不同的技术，这些技术难以以可扩展的方式组合。在这项工作中，我们通过开发一种新型设备来克服这一挑战，该新设备由嵌入在圆形bragg谐振器中的量子点组成，然后集成到微机械压电驱动器上。谐振器工程师的光结合相互作用，以提高提取效率高达0.69（4）。同时，执行器操纵应变场，以调整量子点，以生成具有校正忠诚度的纠缠光子的最大纠缠状态，最高为0.96（1）。这项混合技术有可能克服基于基于QD的基于QD的纠缠源来基于纠缠的量子密钥分布和基于纠缠的量子网络的关键利率局限性。
A quantum-light source that delivers photons with a high brightness and a high degree of entanglement is fundamental for the development of efficient entanglement-based quantum-key distribution systems. Among all possible candidates, epitaxial quantum dots are currently emerging as one of the brightest sources of highly entangled photons. However, the optimization of both brightness and entanglement currently requires different technologies that are difficult to combine in a scalable manner. In this work, we overcome this challenge by developing a novel device consisting of a quantum dot embedded in a circular Bragg resonator, in turn, integrated onto a micromachined piezoelectric actuator. The resonator engineers the light-matter interaction to empower extraction efficiencies up to 0.69(4). Simultaneously, the actuator manipulates strain fields that tune the quantum dot for the generation of entangled photons with corrected fidelities to a maximally entangled state up to 0.96(1). This hybrid technology has the potential to overcome the limitations of the key rates that plague QD-based entangled sources for entanglement-based quantum key distribution and entanglement-based quantum networks.
