Best-kept secrets - quantum cryptography

Thursday, 20 January 2005, 9:17 AM EST

The National Security Agency or one of the Federal Reserve banks can now buy a quantum-cryptographic system from two small companies--and more products are on the way. This new method of encryption represents the first major commercial implementation for what has become known as quantum information science, which blends quantum mechanics and information theory. The ultimate technology to emerge from the field may be a quantum computer so powerful that the only way to protect against its prodigious code-breaking capability may be to deploy quantum-cryptographic techniques.

By Gary Stix at Scientific American.

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