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arXiv quant-ph/0307237quant-phcond-mathep-th
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量子力学中的强耦合微扰理论

Strong Coupling Perturbation Theory in Quantum Mechanics

Marco Frasca

摘要:

我们全面介绍了最近设计的量子力学强耦合微扰理论。为了把理论在一个适当的历史角度,方法设计的量子场论迅速提出,显示它如何意味着一种对偶性的微扰理论,从一开始。然后介绍了微扰论中的重整化群方法。这种方法允许在微扰理论中恢复常值,并使重新计算完全算法化,将微扰计算转化为一步一步的计算过程。然后,根据量子绝热理论中的一个结果,揭示了强耦合展开式的适当应用所依据的一般定理。这个定理给出了强耦合展开式的首阶。然后,在引入微扰论中的对偶性原理,使之与量子场论方法相结合后,给出了由此产生的强耦合展开理论和自由图像。最后给出了一种计算摄动级数的算法。这种方法在量子光学、凝聚态等领域有着广泛的应用,扩展了量子场论方法的原有期望。因此,我们给出了一些应用的例子,在最近几年,被证明是非常重要的一类二能级系统。可以以这种方式获得的最有趣的概念之一是量子放大器(QAMP),其允许获得单个辐射模式的基态的量子波动的经典水平的放大。

英文摘要:

We present a full introduction to the recent devised perturbation theory for strong coupling in quantum mechanics. In order to put the theory in a proper historical perspective, the approach devised in quantum field theory is rapidly presented, showing how it implies a kind of duality in perturbation theory, from the start. The approach of renormalization group in perturbation theory is then presented. This method permits to resum secularities in perturbation theory and makes fully algorithmical the resummation, transforming the perturbation calculations in a step by step computational procedure. The general theorem on which is founded a proper application of the strong coupling expansion, based on a result in the quantum adiabatic theory, is then exposed. This theorem gives the leading order of a strong coupling expansion. Then, after the introduction of the principle of duality in perturbation theory that puts in a proper context the quantum field theory method, the resulting theory of the strong coupling expansion and the free picture are presented. An algorithm for the computation of the perturbation series is finally given. This approach has a lot of applications in fields as quantum optics, condensed matter and so on, extending the original expectations of the quantum field theory method. So, we give some examples of application for a class of two-level systems that, in recent years, proved to be extremely important. One of the most interesting concepts that can be obtained in this way is that of a Quantum Amplifier (QAMP) that permits to obtain an amplification to the classical level of the quantum fluctuations of the ground state of a single radiation mode.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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