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
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 ...
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Google Collaborates with D-Wave on Possible Quantum Image Search
4 hours ago |
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(PhysOrg.com) -- Always on the cutting edge of new computing technologies, Google has recently announced that it is investigating the use of quantum computing schemes to achieve faster image recognition rates. ...
AOptix Technologies and NuCrypt demonstrate physical-layer quantum encryption
Dec 14, 2009 |
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AOptix Technologies, a leading edge developer of ultra-high bandwidth laser communication solutions, and NuCrypt, a provider of technology for ultra-high security over optical communication networks, disclosed today the recent ...
Physicists lay the groundwork for cooler, faster computing
22 hours ago |
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University of Toronto quantum optics researchers Sajeev John and Xun Ma have discovered new behaviours of light within photonic crystals that could lead to faster optical information processing and compact computers that ...
Canadian first: The heart in telemonitoring
11 hours ago |
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The electrophysiology team at the Montreal Heart Institute (MHI) recently performed the first implantation of a new type of cardiac pacemaker (Accent RF) in Canada. This landmark procedure was carried out on October 22, 2009 ...
New structure could produce efficient semiconductor laser sources
Dec 14, 2009 |
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(PhysOrg.com) -- University of Wisconsin-Madison researchers have achieved a nanoscale laser structure they anticipate will produce semiconductor lasers in the next two years that are more than twice as efficient ...
Researchers Identify Key Molecules in Photosynthesis
Dec 02, 2009 |
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(PhysOrg.com) -- Chemistry professor Harry Frank led an international group of researchers that identified the molecules in algae which direct the organisms to convert sunlight into oxygen. The findings may ...
Scientists discover mechanism behind superinsulation
23 hours ago |
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(PhysOrg.com) -- Scientists at the U.S. Department of Energy's Argonne National Laboratory have discovered the microscopic mechanism behind the phenomenon of superinsulation, the ability of certain materials ...
Watermelon: Fruit on the Fast Track
Dec 14, 2009 |
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(PhysOrg.com) -- Agricultural Research Service (ARS) scientists are studying how watermelons grow from tiny flowers to plus-size, market-ready produce in only five weeks. Their findings have resulted in the ...
Sign language puzzle solved
Technology / Computer Sciences
8 hours ago |
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(PhysOrg.com) -- Scientists have known for 40 years that even though it takes longer to use sign language to sign individual words, sentences can be signed, on average, in the same time it takes to say them, ...
CEO charisma biases financial analysts, can hurt investors, study says
5 hours ago |
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Projecting the charisma of a newly hired Chief Executive Officer often leads financial analysts to make crucial errors in forecasting the company's future performance, according to a new study in the current issue of Organization Sc ...
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