因为伊芙要想读到这个信息,从而获得密钥,她必须要破坏一些光量子。
Since Bob will certainly notice the missing photons, Eve will need to create and sendidentical ones to Bob to avoid detection.
因为鲍伯肯定会注意到这些消失的光子,伊芙就必须创造并向鲍伯发送相同的光子,才能不会被发觉。
But Alice and Bob can stop that by using two different quantum properties, such as thepolarities of the photons, to encode the ones and zeros of which the key is composed.
但是艾莉斯和鲍伯通过将两种不同属性比如不同极性的光子--的量子转译成1和0,以阻止伊芙的拦截。
According to Werner Heisenberg s Uncertainty Principle, only one of these two properties canbe measured, so Eve cannot reconstruct each photon without making errors.
根据海森堡的不确定性原理,伊芙只能捕捉到这两种不同属性光子中的一种,所以她无法完全再造出一模一样的光子。
If Bob detects such errors he can tell Alice not to send the actual message until the line hasbeen secured.
如果鲍伯发现这种错误的话,他就会通知艾莉斯,在通信渠道安全之前,不要发送真正的信息。
One exponent of this approach is ID Quantique, a Swiss firm.
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