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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 Negativity (quantum mechanics) ： ウィキペディア英語版 Negativity (quantum mechanics) In quantum mechanics, negativity is a measure of quantum entanglement which is easy to compute. It is a measure deriving from the PPT criterion for separability. It has shown to be an entanglement monotone and hence a proper measure of entanglement. ==Definition== The negativity of a subsystem $A$ can be defined in terms of a density matrix $\backslash rho$ as: :$\backslash mathcal(\backslash rho)\; \backslash equiv\; \backslash frac$ where: *$\backslash rho^$ is the partial transpose of $\backslash rho$ with respect to subsystem $A$ *$||X||\_1\; =\; \backslash text|X|\; =\; \backslash text\; \backslash sqrt$ is the trace norm or the sum of the singular values of the operator $X$. An alternative and equivalent definition is the absolute sum of the negative eigenvalues of $\backslash rho^$: :$\backslash mathcal(\backslash rho)\; =\; \backslash sum\_i\; \backslash frac\}$ where $\backslash lambda\_i$ are all of the eigenvalues. 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「Negativity (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.