arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1508.03468cond-mat.str-elhep-thquant-ph
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具有广义整体对称性的拓扑相

Topological phases with generalized global symmetries

Beni Yoshida

摘要:

我们提出了简单的晶格实现具有$q$形式的全局对称性的拓扑保护(SPT)相位,其中带电激发具有$q$空间维度。具体地说,我们构建$d$空间维模型上支持的$(d+1)$着色图使用一族酉相位门,称为多量子比特控制$Z$门在量子信息社区。在我们的结构中,不同维度的带电激发可以共存,形成一个短程纠缠态,并由不同维度的对称性算符保护。从量子线路复杂性的意义上说,所提出的模型的非平凡性,通过研究保护边界模式,规范模型和相应的带隙畴壁得到证实。我们也评论我们的建设量子纠错码的应用,并讨论相应的容错逻辑门。

英文摘要:

We present simple lattice realizations of symmetry-protected topological (SPT) phases with $q$-form global symmetries where charged excitations have $q$ spatial dimensions. Specifically, we construct $d$ space-dimensional models supported on a $(d+1)$-colorable graph by using a family of unitary phase gates, known as multi-qubit control-$Z$ gates in quantum information community. In our construction, charged excitations of different dimensionality may coexist and form a short-range entangled state which is protected by symmetry operators of different dimensionality. Non-triviality of proposed models, in a sense of quantum circuit complexity, is confirmed by studying protected boundary modes, gauged models and corresponding gapped domain walls. We also comment on applications of our construction to quantum error-correcting codes, and discuss corresponding fault-tolerant logical gates.

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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