quantum cryptography

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quantum cryptography

An encryption method that can detect eavesdropping. Using optical transmission to send a secret key to the other side, quantum cryptography draws on the inherent properties of photons, which become slightly altered if they are observed by an intruder. When an alteration is detected, the receiver knows the sender's key has been compromised. See cryptography.

Polarized and Entangled Photons
One method relies on the polarization of the photons, which will be altered if observed (see QKD). Another method uses photon pairs that exhibit a correlation between them. Any observation along the way weakens the correlation, which can be detected.
References in periodicals archive ?
In addition to unbreakable quantum encryption and communication networks, they include quantum algorithms to solve computing problems that would take today's machines a century to crack and quantum sensors that exploit the mechanics of superposition and entanglement to achieve higher sensitivity and resolution, for instance, in measuring underground voids or providing noninvasive diagnostics.
A small number of commercial companies have offered quantum encryption systems.
Koashi and his colleagues developed a quantum encryption approach that seems to make the potential presence of snoops moot.
A recent quantum encryption test over Free Space Optical (FSO) links was completed by Aoptix Technologies, an ultra-high-bandwidth laser communication system developer, and Nucrypt, a provider of ultra-high security technology over optical communication networks, for the US Air Force Research Laboratory.
TELECOMWORLDWIRE-18 January 2010-AOptix and NuCrypt conduct quantum encryption test for AFRL(C)1994-2010 M2 COMMUNICATIONS http://www.
Quantum encryption is here, but the laws of physics can do much more than protect privacy
Company officials said the initial markets for these quantum encryption keys are government agencies and financial institutions.
According to Associated Press, the work is the closest scientists have come to a real-world quantum encryption system that uses light particles called photons to lock and unlock information instead of random-number "keys.
Just in time for the total surveillance state, here comes quantum encryption.
Qubitekk, a San Diego-based quantum technology company, which has been developing a quantum encryption device based on the single-photon source concept, hopes to strengthen that technology through further development of ORNLs novel approach.
00542) second transmitted quantum encryption keys between space and the ground, representing a secure communication that can travel long distances.

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