In recent years, research on integrated quantum circuits has developed rapidly and exciting results have been achieved. The overarching goal of this emerging research direction in the field of modern quantum technology is the scalable integration of quantum functionality on robust chips. Such chips can work independently of one another, but it is even more interesting to develop them modularly for integration into larger quantum networks, thereby linking quantum computation and quantum communication in the same framework. In this context, the ongoing development and further optimization of integrated quantum circuits aim, inter alia, to achieve a quantum advantage in the area of quantum computing and to pave the way for multipartite quantum networks. The functionality of such chips is essentially based on single-photon operations, such as interference at beam splitters in combination with phase shifters in the field of linear optical quantum computing and Bell-state measurements for entanglement swapping in long-distance quantum networks. While individual functionalities such as CNOT gates and more complex quantum computing operations such as boson sampling in a combination of waveguide chips and external photon sources and detectors were successfully demonstrated, the field is currently facing the major challenge of integrating all necessary components monolithically on chip in order to exploit the full potential of integrated quantum nanophotonics. The present Perspective discusses the status and the present challenges of integrated quantum nanophotonics based on on-demand single-photon emitters and gives an outlook on required developments to enter the next level of fully functional quantum circuits for photonic quantum technology.

中文翻译：

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集成纳米光子学，用于开发基于按需单光子发射器的全功能量子电路

近年来，对集成量子电路的研究发展迅速，并取得了令人兴奋的结果。在现代量子技术领域，这一新兴研究方向的总体目标是在坚固的芯片上可扩展地集成量子功能。这样的芯片可以彼此独立地工作，但是更有趣的是模块化地开发它们以集成到更大的量子网络中，从而在同一框架中链接量子计算和量子通信。在这种情况下，集成量子电路的不断发展和进一步优化的目标尤其是，以在量子计算领域获得量子优势，并为多方量子网络铺平道路。这种芯片的功能性基本上基于单光子操作，例如在线性光学量子计算领域的分束器与相移器相结合的干扰以及用于长距离量子网络中纠缠交换的贝尔状态测量。虽然成功地展示了诸如CNOT门之类的单个功能以及诸如波导芯片与外部光子源和检测器相结合的玻色子采样之类的更复杂的量子计算操作，但该领域目前面临着将所有必要组件单片集成到芯片中的主要挑战。为了开发集成量子纳米光子学的全部潜力。