In quantum information science, a classical information channel (often called simply classical channel) is a communication channel that can be used to transmit classical information (as opposed to quantum channel which can transmit quantum information). An example would be a light travelling over fiber optics lines or electricity travelling over phone lines. Although classical channels cannot transmit quantum information by themselves, they can be useful in combination with quantum channels. Examples of their use are: * In quantum teleportation, a classical channel together with a previously prepared entangled quantum state are used to transmit quantum information between two parties. Neither the classical channel nor the previously prepared quantum state alone can do this task. * In quantum cryptography, a classical channel is used along with a quantum channel in protocols for quantum key exchange. * In quantum communication, the information rate of a noisy quantum channel can be increased when used together with a noise-free classical channel. In particular, some very noisy quantum channels cannot transmit quantum information if used alone but can transmit it if used together with a classical channel (which is not capable of transmitting quantum information by itself). (Wikipedia).
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Experts examine a cylinder shaped "core" from ancient Egypt that could reveal more advanced technologies, in this clip from Ancient Mysteries. #AncientMysteries Subscribe for more from Ancient Mysteries and other great The HISTORY Channel shows: http://histv.co/SubscribeHistoryYT HISTOR
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Would humans be able to survive a mega-disaster such as this one? Find out in this clip from Mega Disasters. #MegaDisasters Subscribe for more from Mega Disasters and other great The HISTORY Channel shows: http://histv.co/SubscribeHistoryYT Check out exclusive The HISTORY Channel cont
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From playlist Mega Disasters | Official Series Playlist | History
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The History Channel - Welcome to a World Worth Knowing
What’s the fastest jet ever? When did people start using forks? You have questions and The HISTORY Channel has answers. Whether you’re listening to best-in-class podcasts, uncovering secrets behind notorious prison escapes with Morgan Freeman, or making ancient Chinese dumplings with Sohl
From playlist Sneak Peeks | History
The History Channel - Welcome To a World Worth Knowing
What’s the fastest jet ever? When did people start using forks? You have questions and The HISTORY Channel has answers. Whether you’re listening to best-in-class podcasts, uncovering secrets behind notorious prison escapes with Morgan Freeman, or making ancient Chinese dumplings with Sohl
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Matthias Christandl: "Fault-tolerant Coding for Quantum Communication"
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MagLab Theory Winter School 2018: Steven Girvin - Entanglement Entropy
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PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE ↓ More info below ↓ Check out the new Space Time Merch Store! https://pbsspacetime.com/ Support Space Time on Patreon https://www.patreon.com/pbsspacetime When we finally ha
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Fang Song - Introduction to quantum computing Part 3 of 3 - IPAM at UCLA
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History's Most Controversial Photos | History
Look back at some of the photographs and photography installations that left their mark on history. Newsletter: https://www.history.com/newsletter Website - http://www.history.com /posts Facebook - https://www.facebook.com/History Twitter - https://twitter.com/history HISTORY Topical Vid
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