半导体量子点量子光源研究进展

半导体量子点被认为是制备量子光源的最佳方案。量子点量子光源的可控性、纯度、亮度、全同性和相干性都有了很大的提高，已接近于应用水平。归纳了基于半导体量子点的量子光源研究进展中的关键问题，指出了半导体量子点量子光源在3个方面的主要进展，并讨论了关键制备技术，即半导体量子点作为单光子光源，实现了高全同性、高纯度、高收集效率等特性; 通过降低精细结构分裂效应等措施，量子点量子光源实现了具有高比特率、高保真度特性的光子纠缠; 量子点量子光源与平面电子线路和纳米光子系统的芯片集成取得了显著成效。在此基础上，对半导体量子点量子光源在量子信息领域的研究前景进行了展望。

The progress of semiconductor quantum dot based quantum emitter

Quantum emitters serve as the building blocks of quantum network, connecting quantum computing, quantum communication and quantum metrology. Semiconductor quantum dots (QDs) are widely considered as the best candidate for quantum emitters. By a decade of effort, the controllability, purity, brightness, indistinguishability, and coherence of QD emitters are greatly improved so that they are much closer to the application level. In this paper, the scientific and technological development of quantum emitters based on QDs were reviewed. Firstly, QD-based single photon sources have achieved indistinguishability of near unity, high purity, and high extraction efficiency. Secondly, QD-based entangled photon emitters have achieved high bit rate, high entanglement fidelity by improvements such as eliminating fine structure splitting. Thirdly, remarkable development has been made towards on-chip integration of QD emitters into planar circuits and nano-photonic systems. It turns out that quantum emitters based on semiconductor QDs are greatly potential to be applied in quantum information processing systems in the near future.