In a recent paper (Khokhlov, 2016), a protocol was proposed for using weak measurement to attack BB84. This claimed the four basis states typically used could be perfectly discriminated, and so an interceptor could obtain all information carried. We show this attack fails when considered using standard quantum mechanics, as expected — such “single-shot” quantum state discrimination is impossible, even using weak measurement.

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评论“BB84协议攻击安排方案”

在最近的一篇论文 (Khokhlov, 2016) 中，提出了一种使用弱测量来攻击 BB84 的协议。这声称通常使用的四种基本状态可以完全区分，因此拦截器可以获得所有携带的信息。正如预期的那样，当考虑使用标准量子力学时，我们证明这种攻击会失败——即使使用弱测量，这种“单次”量子状态区分也是不可能的。