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arXiv math-ph/0610054math-phmath.MP
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Pauli-Fierz算子弱耦合极限的推广

Extended Weak Coupling Limit for Pauli-Fierz Operators

Jan Derezinski, Wojciech De Roeck

摘要:

研究了由一个小子系统和贮库组成的量子系统的弱耦合极限。自[Dav 74]以来,严格地知道限制于小系统的海森堡演化在适当的意义上收敛于马尔可夫半群。九十年代,Accardi、Frigerio和Lu [AFL 90]发起了对未约化么正演化到量子朗之万方程产生的奇异么正演化的收敛性的研究。我们提出了一个版本的这种收敛,这是既简单又强于我们知道的配方。我们的主要结果表明,在适当理解的弱耦合极限下,小系统与环境的相互作用可以用所谓的量子白噪声来表示。

英文摘要:

We consider the weak coupling limit for a quantum system consisting of a small subsystem and reservoirs. It is known rigorously since [Dav74] that the Heisenberg evolution restricted to the small system converges in an appropriate sense to a Markovian semigroup. In the nineties, Accardi, Frigerio and Lu [AFL90] initiated an investigation of the convergence of the unreduced unitary evolution to a singular unitary evolution generated by a quantum Langevin equation. We present a version of this convergence which is both simpler and stronger than the formulations which we know. Our main result says that in an appropriately understood weak coupling limit the interaction of the small system with environment can be expressed in terms of the so-called quantum white noise.

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