If Eve intercepts Bob's pulses and changes the separation between them, she can trick Alice into sending photons that have slightly different polarisations from those that were intended.
如果伊娃能够截取鲍勃方发送的这两道脉冲，并改变其间距，就可以诱使爱丽丝方发送出与原计划略有不同的极性光子。
By comparing a subset of the photons that Alice sends with what Bob measures, the pair can check for the presence of errors introduced by Eve.
通过与爱丽丝发送给鲍勃的光子子集进行比对，双方就可以发现在传输过程中出现了错误，伊娃也就暴露出来了。
By comparing a subset of the photons that Alice sends with what Bob measures, the pair can check for the presence of errors introduced by Eve.
通过与爱丽丝发送给鲍勃的光子子集进行比对，双方就可以发现在传输过程中出现了错误，伊娃也就暴露出来了。
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