Experimental demonstration of counterfactual quantum communication.

@article{Liu2012ExperimentalDO,
  title={Experimental demonstration of counterfactual quantum communication.},
  author={Yang Liu and Lei Ju and Xiao-lei Liang and Shi-Biao Tang and Guo-Liang Shen Tu and Lei Zhou and Cheng-Zhi Peng and Kai Chen and Teng-Yun Chen and Zeng-Bing Chen and Jian-Wei Pan},
  journal={Physical review letters},
  year={2012},
  volume={109 3},
  pages={
          030501
        }
}
Quantum effects, besides offering substantial superiority in many tasks over classical methods, are also expected to provide interesting ways to establish secret keys between remote parties. A striking scheme called "counterfactual quantum cryptography" proposed by Noh [Phys. Rev. Lett. 103, 230501 (2009).] allows one to maintain secure key distributions, in which particles carrying secret information are seemingly not being transmitted through quantum channels. We have experimentally… 

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DWDM: Dense wavelength division multiplexer, FF: Fiber Filter, OD: Optical delay line

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