information theory

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(computer science) a statistical theory dealing with the limits and efficiency of information processing

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In contrast, information theory based on the conventional probability theory is called classical information theory when we need to distinguish it from quantum information theory, even when the devices employ quantum effects in their insides, because the input and the output are based on classical mechanics.
Because the framework of classical information theory cannot deal with a quantum system, to consider optical communication within classical information theory, we need to fix the modulator converting the input signal to the input quantum state and the detector converting the output quantum state to the outcome, as shown in Fig.
In Section 2, we recall the results from classical information theory that are needed by the rest of this publication.
We present them with proofs, because the proofs are short, help reading the novel results in subsequent sections, and, unlike classical information theory, we also consider multiple representations of the same object.
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