Hyper-entangled photon pairs from single quantum dots Geng Chen, Chuan-Feng Li, Zhen-Qiang Yin, Yang Zou, Li-Xin He and Guang-Can Guo EPL, 89 4 (2010) 44002 Published online: 09 March 2010 DOI: 10.1209/0295-5075/89/44002