Yin Hua-Lei, Chen Zeng-Bing
Opt Lett. 2020 Apr 1;45(7):1627-1630. doi: 10.1364/OL.387877.
The BB84-based quantum key distribution system is limited in high-speed and chip integration due to the requirement of preparing and measuring four states. Recently, the simplified BB84 protocol with preparation and measurement of only three states has showed the approximate secret key rate with standard BB84. However, the security proof is valid only under the collective attack and requires the basis-independent detection efficiency condition. Here, we provide a security proof against the coherent attack, which simultaneously removes the basis-independent detection efficiency condition. Importantly, the phase error rate formula is quite simple through subtle observation. We expect that the simplified BB84 protocol with the decoy-state method can be implemented widely in reality.
基于BB84的量子密钥分发系统由于需要制备和测量四种状态，在高速和芯片集成方面受到限制。最近，仅制备和测量三种状态的简化BB84协议已显示出与标准BB84近似的密钥率。然而，其安全性证明仅在集体攻击下有效，并且需要与基无关的探测效率条件。在此，我们提供了一种针对相干攻击的安全性证明，同时消除了与基无关的探测效率条件。重要的是，通过巧妙观察，相位错误率公式相当简单。我们期望采用诱骗态方法的简化BB84协议能够在实际中得到广泛应用。
