The improved Bostrom-Felbinger protocol against attacks without eavesdropping
In this paper, by introducing the additional classical information and taking advantage of the property of quantum entanglement swapping of two photon pairs instead of the property of quantum entanglement of a photon pair, the Bostrom-Felbinger protocol [Phys. Rev. Lett. 89, 187902 (2002)] is improved. In the improved protocol, when the photon travels from the message receiver's site to the message sender's site, any attack can be detected in the control mode. Moreover, it is deterministically successful to transmit the secret messages in the message mode. The security of the present improved protocol against the eavesdropping is ensured by the Bostrom-Felbinger protocol, and besides, the attacks proposed by Cai [Phys. Rev. Lett. 90, 109801 (2003)] to attack the Bostrom-Felbinger protocol without eavesdropping can be prevented.
bostrom-felbinger protocol attack without eavesdropping quantum entanglement swapping