= Channel-state duality
{wiki=Channel-state_duality}
Channel-state duality is a concept in quantum information theory that highlights a fundamental relationship between quantum channels and quantum states. It provides a framework for understanding how information can be transmitted or processed using quantum systems. In quantum information, a *quantum channel* refers to a completely positive, trace-preserving linear map that can transmit quantum information from one system to another, typically representing the effect of noise and other physical processes on the quantum states.
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