Quantum communication is a measure of our ability to encode and decode information in physical systems. The physical systems under consideration are presumed to obey the laws of quantum mechanics. The nature of the information in the quantum system may be considered as "classical" or "quantum". The term classical information refers to states that are discrete, distinguishable, and arbitrarily copyable. These assumptions are used to define alphabets in standard (non-quantum) information theory. Quantum information, on the other hand, has no analogue in standard information theory. In order to process information in a quantum computer, or distribute a secret key in quantum cryptography, the quantum nature of the systems must be preserved. The communication of quantum information therefore describes our ability to preserve an unknown quantum state with high fidelity.
Communication normally implies transmission of the encoded information to a remote location, however, the storing of information may be considered as transmission of information through time. The encoding of information may be used to decrease the resources needed to store the information (data compression), or used to add redundancy to the message to allow for correction of errors caused by noise during transmission (noisy channel capacity).
- Teleportation
- Channels
- Classical channel capacity
- Quantum channel capacity
- Channels (CP maps)
- Coherent information
- Enhancement of channel capacities with entanglement
- Additivity
See also
Articles in category "Quantum Communication"
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