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密碼學中的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.
關于“墨子沙龍”
墨子沙龍是由中國科學技術大學上海研究院主辦、上海市浦東新區(qū)科學技術協(xié)會及中國科大新創(chuàng)校友基金會協(xié)辦的公益性大型科普論壇 。沙龍的科普對象為對科學有濃厚興趣、熱愛科普的普通民眾,力圖打造具有中學生學力便可以了解當下全球最尖端科學資訊的科普講壇 。

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