密码学中的state是什么意思( 七 )


say a single photon,
it sometimes gets amplified, but it sometimes also doesn't get amplified
and you get a noise photon that comes out along with it.
So the beam gets brighter.
But it's no more useful in distinguishing the polarization
than the original unamplified beam.
So there's no way around this uncertainty principle.
关于“墨子沙龙”
墨子沙龙是由中国科学技术大学上海研究院主办、上海市浦东新区科学技术协会及中国科大新创校友基金会协办的公益性大型科普论坛 。沙龙的科普对象为对科学有浓厚兴趣、热爱科普的普通民众,力图打造具有中学生学力便可以了解当下全球最尖端科学资讯的科普讲坛 。

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