Acín Antonio, Gisin Nicolas, Masanes Lluis
ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain.
Phys Rev Lett. 2006 Sep 22;97(12):120405. doi: 10.1103/PhysRevLett.97.120405. Epub 2006 Sep 20.
The first step in any quantum key distribution (QKD) protocol consists of sequences of measurements that produce correlated classical data. We show that these correlation data must violate some Bell inequality in order to contain distillable secrecy, if not they could be produced by quantum measurements performed on a separable state of larger dimension. We introduce a new QKD protocol and prove its security against any individual attack by an adversary only limited by the no-signaling condition.
任何量子密钥分发（QKD）协议的第一步都包含一系列测量，这些测量会产生相关的经典数据。我们证明，为了包含可提取的保密性，这些相关数据必须违反某些贝尔不等式，否则它们可能由对更大维度的可分态进行的量子测量产生。我们引入了一种新的QKD协议，并证明了它对任何仅受无信号条件限制的对手的个体攻击具有安全性。
