[2] Liu Dan, Pei Changxing, Quan Dongxiao, et al. A new quantum secure direct communication scheme with authentication ［J］. Chinese Physics Letters, 2010, 27(9): 301-304.

[11] Pan Jianwei, Christoph Simon, Caslav Brukner, et al. Entanglement purification for quantum communication ［J］. Nature, 410: 1067-1070.

[12] Pan Jianwei, Sara Gasparoni, Rupert Ursin, et al. Experimental entanglement purification of arbitrary unknown states ［J］. Nature, 423: 417-422.