Quantum channel
hideIn quantum information theory, a quantum channel is a communication channel which can transmit quantum information, as well as classical information. An example of quantum information is the state of a qubit. An example of classical information is a text document transmitted over the internet.
More formally, quantum channels are completely positive, trace preserving maps between spaces of operators, as defined more precisely below.
For more information about Quantum channel, read the full article at
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News tagged with quantum communication
In quantum channels, zero plus zero can equal non-zero
Oct 06, 2008 |
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(PhysOrg.com) -- Physicists have discovered a strange characteristic of quantum communication channels. If two quantum channels each have a transmission capacity of zero, they may still have a nonzero capacity ...
Long-Lasting Quantum Memory Leads to Long-Distance Quantum Communication
Oct 07, 2008 |
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(PhysOrg.com) -- Physicists have taken a step closer to realizing long-distance quantum communication, in which a quantum state is transferred from one location to another by becoming entangled with a traveling ...
Researchers Set New Distance Record for Quantum Key Distribution
Jul 21, 2009 |
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(PhysOrg.com) -- Quantum key distribution (QKD) could be the next commercial success of quantum physics, and a recent study has taken the field a step closer to this reality. Researchers from the University ...
Viterbi Algorithm goes quantum
Jul 31, 2008 |
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The Viterbi Algorithm, the elegant 41-year-old logical tool for rapidly eliminating dead end possibilities in data transmission, has a new application to go alongside its ubiquitous daily use in cell phone ...
Quantum communication through synergy
Jan 19, 2009 |
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(PhysOrg.com) -- When most people think of quantum communication, they think in terms of private communication channels - the ability to send messages without a third-party deciphering them. Indeed, quantum cryptography represents ...
Quantum calibration paves way for super-secure communication
Nov 17, 2008 |
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(PhysOrg.com) -- A new approach to calibrating quantum mechanical measurement has been developed with particular applications in optics and super-secure quantum communication.
Straightening messy correlations with a quantum comb
Nov 23, 2009 |
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Quantum computing promises ultra-fast communication, computation and more powerful ways to encrypt sensitive information. But trying to use quantum states as carriers of information is an extremely delicate ...
Scientists develop novel ion trap for sensing force and light
Jul 01, 2009 |
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Miniature devices for trapping ions (electrically charged atoms) are common components in atomic clocks and quantum computing research. Now, a novel ion trap geometry demonstrated at the National Institute ...
Scientists to study diamond-based quantum information processing, communication
Apr 15, 2009 |
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(Santa Barbara, Calif.) -- In the quest for quantum information processing, diamonds may be a physicist's best friend.
