Upper bound on key generation rate of quantum key distribution with two-way or two-step quantum channels

作者：Lu, Hua^*

来源：Optics Communications, 2011, 284(8): 2254-2256.

DOI：10.1016/j.optcom.2011.01.007

• Asymptotic security
• Two-way quantum channel
• Key generation rate

We present an asymptotic security proof of deterministic quantum key distribution (DQKD) with a two-way quantum channel. The security proof of DQKD with a two-way quantum channel is different from that of BB84, because Eve can attack the travel qubits twice, both in line Bob to Alice and in line Alice to Bob. With the no-signaling principle and the property of mutual information, we obtain an upper bound of the final key generation of entanglement-based DQKD and hence single-photon four-state DQKD. Our results can be applied to the protocol of QKD with two-step quantum channels.

• 出版日期2011-4-15
• 单位湖北工业大学