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arXiv 1507.05643quant-phmath-phmath.MP
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一类非一般系统的量子遍历性

Quantum ergodicity for a class of non-generic systems

Pouya Asadi, Faraj Bakhshinezhad, Ali T. Rezakhani

摘要:

我们研究量子系统的动力学所产生的哈密顿有剩余的简并在其频谱和共振在其能隙的量子正常典型性和遍历性属性。这样的系统可以被认为是非典型的,在这个意义上,简并,这通常是对称性的标志,自然打破了典型的系统,由于随机扰动。特别是,我们证明了一个版本的冯诺依曼的量子遍历定理,修改后的条件需要举行,以具有正常的典型性和遍历性。结果表明,谱的简并性并不显著地改变定理的条件,而共振的存在对于阻碍遍历性更占主导地位。

英文摘要:

We examine quantum normal typicality and ergodicity properties for quantum systems whose dynamics are generated by Hamiltonians which have residual degeneracy in their spectrum and resonance in their energy gaps. Such systems can be considered atypical in the sense that degeneracy, which is usually a sign of symmetry, is naturally broken in typical systems due to stochastic perturbations. In particular, we prove a version of von Neumann's quantum ergodic theorem, where a modified condition needs to hold in order to have normal typicality and ergodicity. As a result, we show that degeneracy of spectrum does not considerably modify the condition of the theorem, whereas the existence of resonance is more dominant for obstructing ergodicity.

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