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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Classical capacity ： ウィキペディア英語版 Classical capacity In quantum information theory, the classical capacity of a quantum channel is the maximum rate at which classical data can be sent over it error-free in the limit of many uses of the channel. Holevo, Schumacher, and Westmoreland proved the following lower bound on the classical capacity of any quantum channel $\backslash mathcal$: :$$ \chi(\mathcal) = \max_(\rho)} where $\backslash rho^$ is a classical-quantum state of the following form: :$$ \rho^ = \sum_x p_X(x) \vert x \rangle \langle x \vert^X \otimes \rho_x^A , $p\_X(x)$ is a probability distribution, and each $\backslash rho\_x^A$ is a density operator that can be input to the channel $\backslash mathcal$. == Achievability using sequential decoding == We briefly review the HSW coding theorem (the statement of the achievability of the Holevo information rate $I(X;B)$ for communicating classical data over a quantum channel). We first review the minimal amount of quantum mechanics needed for the theorem. We then cover quantum typicality, and finally we prove the theorem using a recent sequential decoding technique. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Classical capacity」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.