Tamaki Kiyoshi, Koashi Masato, Imoto Nobuyuki
CREST Research Team for Interacting Carrier Electronics, School of Advanced Sciences, The Graduate University for Advanced Studies (SOKENDAI), Hayama, Kanagawa, 240-0193, Japan.
Phys Rev Lett. 2003 Apr 25;90(16):167904. doi: 10.1103/PhysRevLett.90.167904. Epub 2003 Apr 24.
We prove the unconditional security of the Bennett 1992 protocol, by using a reduction to an entanglement distillation protocol initiated by a local filtering process. The bit errors and the phase errors are correlated after the filtering, and we can bound the amount of phase errors from the observed bit errors by an estimation method involving nonorthogonal measurements. The angle between the two states shows a trade-off between accuracy of the estimation and robustness to noises.
我们通过将其归约为由局部滤波过程启动的纠缠纯化协议，证明了1992年贝内特协议的无条件安全性。滤波后，比特错误和相位错误是相关的，并且我们可以通过一种涉及非正交测量的估计方法，根据观测到的比特错误来限制相位错误的数量。两个状态之间的角度显示了估计精度和噪声鲁棒性之间的权衡。
