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Published online 27 September 2007 | Nature | doi:10.1038/news070924-10
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This quantum stuff just doesn't add up
Mathematical quirk of light shines a path to quantum cryptography.
When does taking one thing away give you more than what you started with? When quantum mechanics gets involved.
Researchers have shown that removing a photon from a laser beam can lead to it containing more photons than it had before1.
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