基于机架集成量子点的电信C波段单光子和纠缠光子源
Rack-integrated quantum dot-based source of single and entangled photons at telecom C-band
AI总结：
研究在量子通信网络发展中，将基于半导体量子点的量子光源在优化机架装置中运行，实现电信C波段纠缠光子发射高符合率，光子传输率超50%，可集成到光纤基础设施，推动量子互联网可行性。
AI中文摘要：
对于日常电信网络中的量子光源，量子科学需要全面转化为量子技术。迈向受控实验室环境之外的第一步需要使用工作在技术相关的电信O和C波段的量子光源。外延量子点可作为量子光的确定性源。特别有趣的是，电信波长的发射器在性能上正迅速赶上短波长的同类产品。在此，我们在量子通信网络发展中迈出决定性一步：在优化的基于机架的装置中运行一种最先进的量子光源——半导体量子点，其在电信C波段纠缠光子发射的符合率创纪录。该装置包括用于量子点激发的可调谐脉冲激光器、用于激发滤波的所有光学器件以及量子点信号耦合到单模光纤。总体而言，该装置对激子和双激子光子的传输率均超过50%。这些结果表明基于量子点的电信光源现在可以传输并集成到现有的光纤基础设施中，这是证明即将到来的量子互联网可行性的重要一步。
英文摘要：
For quantum light sources in everyday telecommunication networks, quantum science needs to be fully transformed into quantum technology. The first necessary step to move outside a well-controlled lab environment requires the use of quantum light sources operating in the technologically relevant telecom O- and C-band. This can be provided using epitaxial quantum dots as deterministic sources of quantum light. Particularly intriguing is that emitters operating at telecom wavelengths are rapidly catching up with their short wavelength counterparts in terms of performances. Here, we make a decisive step forward in the development of quantum communication networks: a state-of-the-art source of quantum light, a semiconductor quantum dot (QD), with record coincidence rate for entangled photon emission in the telecom C-band, is operated inside an optimized rack-based setup. This setup includes a tunable pulsed laser for the QD excitation (from quasi- to fully resonant excitation), all optics for the excitation filtering, and QD signal coupling into single-mode fibers. Overall, the setup allows for above $50\%$ transmission for both exciton and biexciton photons. These results show that quantum dots-based telecom light sources can now be transported and integrated into existing fiber infrastructures, an important step to demonstrate the feasibility of the upcoming quantum internet.
