Cai–Li Communication Protocol in Noisy Quantum Channel

Since the original Cai–Li protocol [Chin. Phys. Lett. 21 (2004) 601] can be used only in an ideal quantum communication, we present the modified Cai–Li protocol that can be used in the a noisy quantum channel by using Calderbank–Shor–Steane (CSS) codes to correct errors. We also give a tight bound on the connection between information Eve eavesdropped with a measurement attack in line B→A and detection probability, which shows that the Cai–Li protocol can be used as a quasisecure direct quantum communication.

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