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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 Bloch-Siegert shift ： ウィキペディア英語版 Bloch-Siegert shift The Bloch-Siegert shift is a phenomenon in quantum physics that becomes important for driven two-level systems when the driving gets strong (e.g. atoms driven by a strong laser drive or nuclear spins in NMR, driven by a strong oscillating magnetic field). When the rotating wave approximation (RWA) is invoked, the resonance between the driving field and a pseudospin occurs when the field frequency $\backslash omega$ is identical to the spin's transition frequency $\backslash omega\_0$. The RWA is, however, an approximation. In 1940 Bloch and Siegert showed that the dropped parts oscillating rapidly can give rise to a shift in the true resonance frequency of the dipoles. ==Rotating wave approximation== In RWA, when the perturbation to the two level system is $H\_\; =\; \backslash frac\; \backslash cos$, a linearly polarized field is considered as a superposition of two circularly polarized fields of the same amplitude rotating in opposite directions with frequencies $\backslash omega,\; -\backslash omega$. Then, in the rotating frame($\backslash omega$), we can neglect the counter-rotating field and the Rabi frequency is :$\backslash Omega\; =\; \backslash frac\; \backslash sqrt.$ 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「Bloch-Siegert shift」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.