Superior properties in room-temperature colloidal-dot quantum emitters revealed by ultralow-dark-count detections of temporally-purified single photons
Superior properties in room-temperature colloidal-dot quantum emitters revealed by ultralow-dark-count detections of temporally-purified single photons
复制标题
DOI：
10.1038/s41598-019-52377-1
复制
发表时间：
2019-11
影响因子：
4.6
通讯作者：
T. Ihara;S. Miki;Toshiki Yamada;T. Kaji;A. Otomo;I. Hosako;H. Terai
中科院分区：
文献类型：
--
作者：
T. Ihara;S. Miki;Toshiki Yamada;T. Kaji;A. Otomo;I. Hosako;H. Terai
实现可在室温下工作的高质量量子发射器对于加速量子通信、量子信息处理和量子计量等量子技术的应用具有重要意义。在这项工作中，我们使用超导纳米线单光子探测器和光致发光衰减曲线的时间滤波来研究单个胶体量子点（CQD）室温发射的光子反聚束特性。我们发现，通过去除由多个激发脉冲产生的双激子连续双光子发射产生的信号，可以同时实现高单光子纯度和高光子生成速率。我们成功地证明了室温单光子源的超高性能，显示 g(2)(0) ≪ 10−2 可以通过对时间纯化的单光子的超低暗计数检测来证实。这些发现为 CQD 作为高质量室温量子光源的候选者的吸引力提供了有力的证据。
The realization of high-quality quantum emitters that can operate at room temperature is important for accelerating the application of quantum technologies, such as quantum communication, quantum information processing, and quantum metrology. In this work, we study the photon-antibunching properties on room-temperature emission from individual colloidal quantum dots (CQDs) using superconducting-nanowire single-photon detectors and temporal filtering of the photoluminescence decay curve. We find that high single-photon purities and high photon-generation rates can be simultaneously achieved by removing the signals originating from the sequential two-photon emission of biexcitons created by multiple excitation pulses. We successfully demonstrate that the ultrahigh performance of the room-temperature single-photon sources showing g(2)(0) ≪ 10−2can be confirmed by the ultralow-dark-count detection of the temporally purified single photons. These findings provide strong evidence for the attractiveness of CQDs as candidates for high-quality room-temperature quantum light sources.