We propose a novel advantage distillation strategy for physical layer-based secret-key-agreement (SKA). We consider a scenario where Alice and Bob aim at extracting a common bit sequence, which should remain secret to Eve, by quantizing a random number obtained from measurements at their communication channel. We propose an asymmetric advantage distillation protocol with two novel features: i) Alice quantizes her measurement and sends partial information on it over an authenticated public side channel, and ii) Bob quantizes his measurement by exploiting the partial information. The partial information on the position of the measurement in the quantization interval and its sharing allows Bob to obtain a quantized value closer to that of Alice. Both strategies increase the lower bound of the secret key rate.

翻译：我们提出了一种新颖的基于物理层的秘钥协议优势提取策略。我们考虑Alice和Bob通过量化在通信通道测量到的随机数来提取一致的比特序列，这个序列应该对Eve保持保密。我们提出了一种不对称的优势提取协议，具有两个新特性：i）Alice将她的测量量化并通过经过验证的公共侧通道发送部分信息，ii）Bob通过利用部分信息量化他的测量。测量在量化区间内的位置和共享的部分信息使Bob可以获得更接近Alice的量化值。这两种策略都可以增加秘钥速率的下边界。