Mismatched-basis statistics enable quantum key distribution with   uncharacterized qubit sources
  In the postprocessing of quantum key distribution, the raw key bits from the mismatched-basis measurements, where two parties use different bases, are normally discarded. Here, we propose a postprocessing method that exploits measurement statistics from mismatched-basis cases, and prove that incorporating these statistics enables uncharacterized qubit sources to be used in the measurement-device-independent quantum key distribution protocol and the Bennett-Brassard 1984 protocol, a case which is otherwise impossible. 
Zhen-Qiang Yin, Chi-Hang Fred Fung, Xiongfeng Ma, Chun-Mei Zhang,   Hong-Wei Li, Wei Chen, Shuang Wang, Guang-Can Guo, and Z...
quant-ph