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Sci Rep. 2016 Jun 30;6:28767. doi: 10.1038/srep28767.

One Step Quantum Key Distribution Based on EPR Entanglement.

Li J1,2, Li N1,3, Li LL1, Wang T1.

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School of Computer Science, Beijing University of Posts and Telecommunications, Beijing 100876, China.
Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
JiLin Medical University, Jilin, 132013, China.


A novel quantum key distribution protocol is presented, based on entanglement and dense coding and allowing asymptotically secure key distribution. Considering the storage time limit of quantum bits, a grouping quantum key distribution protocol is proposed, which overcomes the vulnerability of first protocol and improves the maneuverability. Moreover, a security analysis is given and a simple type of eavesdropper's attack would introduce at least an error rate of 46.875%. Compared with the "Ping-pong" protocol involving two steps, the proposed protocol does not need to store the qubit and only involves one step.

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