Laferrière Patrick, Yeung Edith, Giner Lambert, Haffouz Sofiane, Lapointe Jean, Aers Geof C, Poole Philip J, Williams Robin L, Dalacu Dan
National Research Council of Canada, Ottawa, Ontario, Canada K1A 0R6.
University of Ottawa, Ottawa, Ontario, Canada K1N 6N5.
Nano Lett. 2020 May 13;20(5):3688-3693. doi: 10.1021/acs.nanolett.0c00607. Epub 2020 Apr 16.
Photonics-based quantum information technologies require efficient, high emission rate sources of single photons. Position-controlled quantum dots embedded within a broadband nanowire waveguide provide a fully scalable route to fabricating highly efficient single-photon sources. However, emission rates for single-photon devices are limited by radiative recombination lifetimes. Here, we demonstrate a multiplexed single-photon source based on a multidot nanowire. Using epitaxially grown nanowires, we incorporate multiple energy-tuned dots, each optimally positioned within the nanowire waveguide, providing single photons with high efficiency. This linear scaling of the single-photon emission rate with number of emitters is demonstrated using a five-dot nanowire with an average multiphoton emission probability of <4% when excited at saturation. This represents the first ever demonstration of multiple single-photon emitters deterministically incorporated in a single photonic device and is a major step toward achieving GHz single-photon emission rates from a scalable multi-quantum-dot system.
基于光子学的量子信息技术需要高效、高发射率的单光子源。嵌入宽带纳米线波导中的位置可控量子点为制造高效单光子源提供了一条完全可扩展的途径。然而，单光子器件的发射率受到辐射复合寿命的限制。在此，我们展示了一种基于多量子点纳米线的复用单光子源。利用外延生长的纳米线，我们纳入了多个能量调谐的量子点，每个量子点都在纳米线波导中处于最佳位置，从而高效地提供单光子。使用具有五个量子点的纳米线证明了单光子发射率与发射器数量的这种线性比例关系，当在饱和状态下激发时，其平均多光子发射概率<4%。这代表了首次在单个光子器件中确定性地集成多个单光子发射器，并且是朝着从可扩展的多量子点系统实现千兆赫兹单光子发射率迈出的重要一步。
