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Further Reading




A. Witze. Quantum teleportation leaps forward. Science News. Vol. 181,
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, June 30,
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, 2012, p. 10.
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D. Castelvecchi. Welcome to the quantum internet. Science News. Vol. 174,
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, August 16, 2008, p. 24.
[Go to]




T. Siegfried,
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, L. Sanders. Quantum weirdness. Science News. Vol. 178, November 20, 2010, p. 20.
[Go to]




Quantum cryptography has entered the friendly skies. A precise beam of photons sent from an airplane allowed researchers on the ground to create a nearly unbreakable encryption key to protect information. The experiment, reported March 31 in Nature Photonics,
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, is an important step toward creating a secure global communication network based on beaming photons to and from satellites.

“It is a technical tour de force,” says Seth Lloyd, a mechanical engineer at MIT who was not involved in the study.

The idea of exploiting quantum mechanics to secure communication lines is not new: Since the 1980s, scientists have created encryption keys with sets of photons whose individual spins are known only to the sender and receiver. If a third party eavesdrops on the conversation,
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, the photon spins change,
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, alerting the communicating parties to stop exchanging information.

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