Highly indistinguishable and strongly entangled photons from symmetric GaAs quantum dots.
Highly indistinguishable and strongly entangled photons from symmetric GaAs quantum dots.
复制标题
DOI：
10.1038/ncomms15506
复制
发表时间：
2017-05-26
影响因子：
16.6
通讯作者：
Trotta R
中科院分区：
文献类型：
--
作者：
Huber D;Reindl M;Huo Y;Huang H;Wildmann JS;Schmidt OG;Rastelli A;Trotta R
可伸缩非经典光源的开发是释放量子光子学技术潜力的基础。半导体量子点正在成为难以区分的单光子的近乎最佳的来源。然而，与参数下变频器相比，它们作为纠缠光子对的来源的性能仍然不是很好。从传统的STranski-Krastanov InGaAs量子点发射的光子已经显示出非最佳的纠缠和不可分辨水平。对于量子网络，这两个标准必须同时满足。在这里，我们展示了一种到目前为止受到的关注有限的系统：GaAs量子点，这是可能的。它们可以发射高纯度(g(2)(0)=0.002±0.002)、高不可分辨(2 ns脉冲间隔为0.93±0.07)和高纠缠保真度(0.94±0.01)的触发偏振纠缠光子。我们的结果表明，在未来的量子技术中，GaAs可能是量子点纠缠源的首选材料。可扩展和可集成的纠缠光子对源是量子光子应用的重要组成部分。这里，Huber等人。证明了液滴刻蚀的砷化镓量子点可以发射高度纠缠的难以区分的光子对。
The development of scalable sources of non-classical light is fundamental to unlocking the technological potential of quantum photonics. Semiconductor quantum dots are emerging as near-optimal sources of indistinguishable single photons. However, their performance as sources of entangled-photon pairs are still modest compared to parametric down converters. Photons emitted from conventional Stranski–Krastanov InGaAs quantum dots have shown non-optimal levels of entanglement and indistinguishability. For quantum networks, both criteria must be met simultaneously. Here, we show that this is possible with a system that has received limited attention so far: GaAs quantum dots. They can emit triggered polarization-entangled photons with high purity (g(2)(0) = 0.002±0.002), high indistinguishability (0.93±0.07 for 2 ns pulse separation) and high entanglement fidelity (0.94±0.01). Our results show that GaAs might be the material of choice for quantum-dot entanglement sources in future quantum technologies. Scalable and integratable sources of entangled-photon pairs are an important building block for quantum photonic applications. Here, Huber et al. demonstrate that droplet-etched gallium arsenide quantum dots can emit highly indistinguishable photon pairs with a high degree of entanglement.