Deterministic and Robust Generation of Single Photons On a Chip with   99.5% Indistinguishability Using Rapid Adiabatic Passage
  We demonstrate deterministic and robust generation of pulsed resonance fluorescence single photons from a single InGaAs quantum dot using the method of rapid adiabatic passage. Comparative study is performed with transform-limited, negatively chirped and positively chirped pulses, identifying the last one to be the most robust against fluctuation of driving strength. The generated single 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. The single-photon source can be readily scaled up to multi-photon entanglement and used for quantum metrology, boson sampling and linear optical quantum computing. 
Yu-Jia Wei, Yu-Ming He, Ming-Cheng Chen, Yi-Nan Hu, Yu He, Dian Wu,   Christian Schneider, Martin Kamp, Sven H\"ofling, Chao...
quant-ph cond-mat.mes-hall