Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, & Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China , Hefei, Anhui 230026, China.
Nano Lett. 2014 Nov 12;14(11):6515-9. doi: 10.1021/nl503081n. Epub 2014 Oct 30.
Single photons are attractive candidates of quantum bits (qubits) for quantum computation and are the best messengers in quantum networks. Future scalable, fault-tolerant photonic quantum technologies demand both stringently high levels of photon indistinguishability and generation efficiency. Here, we demonstrate deterministic and robust generation of pulsed resonance fluorescence single photons from a single semiconductor quantum dot using adiabatic rapid passage, a method robust against fluctuation of driving pulse area and dipole moments of solid-state emitters. The emitted photons are background-free, have a vanishing two-photon emission probability of 0.3% and a raw (corrected) two-photon Hong-Ou-Mandel interference visibility of 97.9% (99.5%), reaching a precision that places single photons at the threshold for fault-tolerant surface-code quantum computing. This single-photon source can be readily scaled up to multiphoton entanglement and used for quantum metrology, boson sampling, and linear optical quantum computing.
单光子是量子计算中量子比特（qubit）的理想候选者，也是量子网络中的最佳信息载体。未来可扩展、容错的光子量子技术既需要严格高的光子不可分辨性，又需要高效率的单光子产生。在这里，我们使用绝热快速通道，演示了从单个半导体量子点中确定性和稳健地产生共振荧光单光子。该方法对驱动脉冲面积和固态发射器偶极矩的波动具有鲁棒性。所发射的光子是无背景的，双光子发射概率为 0.3%，原始（校正后）双光子 Hong-Ou-Mandel 干涉可见度为 97.9%（99.5%），达到了容错表面码量子计算的单光子阈值的精度。这种单光子源可以很容易地扩展到多光子纠缠，并用于量子计量学、玻色子抽样和线性光学量子计算。
