STEM与日常科技·英语30篇（2）
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Why Quantum Communication Is Hard to Eavesdrop On
量子通信在防窃听上的直觉
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Quantum communication encodes information in single photons — tiny particles of light — whose properties cannot be copied perfectly.
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If an eavesdropper tries to measure a photon’s polarization, the act itself changes its state, leaving detectable errors.
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Legitimate users compare a random subset of their shared bits over a public channel to spot unusual error rates.
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High error rates signal possible spying, so they discard that key and try again — security is built into the protocol itself.
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Unlike classical encryption, which relies on math problems being hard to solve, quantum security rests on physical laws.
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No device, however advanced, can clone an unknown quantum state — this is the no-cloning theorem, proven and fundamental.
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Current systems use fiber networks up to 100 km long or satellite links for longer distances, like China’s Micius mission.
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Even if hackers store intercepted photons, they cannot decode them later — quantum keys offer ‘forward secrecy’ by design.
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Commercial quantum networks already protect bank transfers and government documents in several countries today.
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It’s not magic — it’s careful engineering guided by quantum mechanics to make interception physically obvious and futile.