Quantum frequency down-conversion of single photons at 1552 nm from single InAs quantum dot
Ma Ben1, 2, 3, Wei Si-Hang1, 2, 3, Chen Ze-Sheng1, 2, 3, Shang Xiang-Jun1, 2, 3, Ni Hai-Qiao1, 2, 3, Niu Zhi-Chuan1, 2, 3, †
       

(color online) Schematic structures of (a) the test sample and (b) the sample of QDs in a DBR cavity.