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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 Purity (quantum mechanics) ： ウィキペディア英語版 Purity (quantum mechanics) In quantum mechanics, and especially quantum information theory, the purity of a quantum state is a scalar defined as :$\backslash gamma\; \backslash ,\; \backslash equiv\; \backslash ,\; \backslash mbox(\backslash rho^2)\; \backslash ,$ where $\backslash rho\; \backslash ,$ is the density matrix of the state. The purity can range between unity, corresponding to a completely pure state, and $1/d\; \backslash ,$, corresponding to a completely mixed state. (Here, $d\; \backslash ,$ is the dimension of the density matrix.) Purity is trivially related to the Linear entropy $S\_L\; \backslash ,$ of a state by :$\backslash gamma\; =\; 1-S\_L\; \backslash ,\; .$ == Projectivity of a measurement == For a quantum measurement, the projectivity〔Taoufik Amri, Quantum behavior of measurement apparatus, ( 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「Purity (quantum mechanics)」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.