![]() ![]() ![]() While most of the work produced so far has been focused on the case in which a given channel transformation acts identically and independently on the various elements of the sequence (memoryless configuration in jargon), correlated error models appear to be a more realistic way to approach the problem. The underlying assumption of this approach is to consider the channel not as acting on a single system, but on sequences of systems, which, when properly initialized allow one to overcome the noisy effects induced by the physical process under consideration. In this context the notion of codes and communication capacities have been introduced by generalizing them from the classical Shannon theory of information transmission and error correction. Quantum information provides a theoretical framework and the proper mathematical tools to accomplish this. Hence it can be characterized from the point of view of communication theory, i.e., in terms of its ability to transfer information. Filippo Caruso, Vittorio Giovannetti, Cosmo Lupo, and Stefano ManciniĪny physical process can be represented as a quantum channel mapping an initial state to a final state. ![]()
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