Institut für Festkörperphysik, Technische Universität Berlin, 10623, Berlin, Germany.
Abteilung für Halbleiterepitaxie, Otto-von-Guericke Universität, 39106, Magdeburg, Germany.
Sci Rep. 2018 Jan 22;8(1):1340. doi: 10.1038/s41598-017-19049-4.
In this work, we present a stand-alone and fiber-coupled quantum-light source. The plug-and-play device is based on an optically driven quantum dot delivering single photons via an optical fiber. The quantum dot is deterministically integrated in a monolithic microlens which is precisely coupled to the core of an optical fiber via active optical alignment and epoxide adhesive bonding. The rigidly coupled fiber-emitter assembly is integrated in a compact Stirling cryocooler with a base temperature of 35 K. We benchmark our practical quantum device via photon auto-correlation measurements revealing g(0) = 0.07 ± 0.05 under continuous-wave excitation and we demonstrate triggered non-classical light at a repetition rate of 80 MHz. The long-term stability of our quantum light source is evaluated by endurance tests showing that the fiber-coupled quantum dot emission is stable within 4% over several successive cool-down/warm-up cycles. Additionally, we demonstrate non-classical photon emission for a user-intervention-free 100-hour test run and stable single-photon count rates up to 11.7 kHz with a standard deviation of 4%.
在这项工作中，我们展示了一个独立的光纤耦合量子光源。该即插即用设备基于一个光学驱动的量子点，通过光纤传输单光子。量子点被确定性地集成在一个单片微透镜中，通过主动光学对准和环氧树脂胶黏合，精确地耦合到光纤的核心。刚性耦合的光纤发射器组件集成在一个紧凑的斯特林制冷机中，其基底温度为 35 K。我们通过光子自相关测量来基准测试我们的实际量子器件，结果表明在连续波激发下 g(0) = 0.07 ± 0.05，并且我们在 80 MHz 的重复率下演示了触发的非经典光。我们通过耐久性测试评估了我们的量子光源的长期稳定性，结果表明，在几个连续的冷却/加热循环中，光纤耦合的量子点发射稳定在 4%以内。此外，我们还演示了在无需用户干预的情况下进行 100 小时的测试运行时的非经典光子发射，以及稳定的单光子计数率高达 11.7 kHz，标准偏差为 4%。
