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arXiv 1607.00799quant-ph
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耦合量子力学中的自旋1/2子动力学

Spin-1/2 sub-dynamics nested in the quantum dynamics of two coupled qutrits

R. Grimaudo, A. Messina, P. A. Ivanov, N. V. Vitanov

摘要:

本文采用推广的$(\vec{\textbf{S}}_1+\vec{\textbf{S}}_2)^2$ -非守恒海森堡模型研究了两个自旋为1的系统$\vec{\textbf{S}}_1$和$\vec{\textbf{S}}_2$的量子动力学.我们表明,由于其对称性,九维动力学的两个qutrits完全重叠成两个子动力学生活在两个正交的四维和五维子空间的直和。这样的减少是进一步加强我们的中心结果组成的事实,即在四维动态不变的子空间,两个qutrits量子动力学,没有近似,相当于两个非相互作用的自旋1/2的。这种显着的和非直观的嵌套所产生的解释优势被系统地利用和各种有趣的功能,从而出现在两个qutrits的动态进行深入研究。利用动力学减少带来的光在本文中的可能性,以及我们的哈密顿模型的时间依赖的版本进行了简要的讨论。

英文摘要:

In this paper we investigate the quantum dynamics of two spin-1 systems, $\vec{\textbf{S}}_1$ and $\vec{\textbf{S}}_2$, adopting a generalized $(\vec{\textbf{S}}_1+\vec{\textbf{S}}_2)^2$-nonconserving Heisenberg model. We show that, due to its symmetry property, the nine-dimensional dynamics of the two qutrits exactly decouples into the direct sum of two sub-dynamics living in two orthogonal four- and five-dimensional subspaces. Such a reduction is further strengthened by our central result consisting in the fact that in the four-dimensional dynamically invariant subspace, the two qutrits quantum dynamics, with no approximations, is equivalent to that of two non interacting spin 1/2's. The interpretative advantages stemming from such a remarkable and non-intuitive nesting are systematically exploited and various intriguing features consequently emerging in the dynamics of the two qutrits are deeply scrutinised. The possibility of exploiting the dynamical reduction brought to light in this paper for exactly treating as well time-dependent versions of our Hamiltonian model is briefly discussed.

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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