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arXiv 1609.02574quant-phcond-mat.str-elmath-phmath.MP
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作为张量网络的费米拓扑量子态

Fermionic topological quantum states as tensor networks

C. Wille, O. Buerschaper, J. Eisert

摘要:

张量网络态,特别是投影纠缠对态,在强关联量子晶格系统的描述中起着重要的作用。它们不仅在数值模拟方法中充当变分态,而且还提供了一个框架,用于对量子物质的相进行分类,并以严格和严格的语言捕获拓扑序的概念。自旋模型和玻色子系统在这一领域的快速发展还没有被费米模型的类似发展所反映。在这项工作中,我们介绍了一个框架的张量网络具有费米组件能够捕捉拓扑秩序的概念。形式主义的核心是费米子矩阵乘积算子的单射性公理,在级联下是稳定的。在此基础上,我们构造了费米子扭曲量子双模型基态的格拉斯曼数张量网络模型。一个具体的重点是把费米子环面代码的范例。这项工作表明,使用张量网络描述拓扑有序系统的程序延续到费米子模型。

英文摘要:

Tensor network states, and in particular projected entangled pair states, play an important role in the description of strongly correlated quantum lattice systems. They do not only serve as variational states in numerical simulation methods, but also provide a framework for classifying phases of quantum matter and capture notions of topological order in a stringent and rigorous language. The rapid development in this field for spin models and bosonic systems has not yet been mirrored by an analogous development for fermionic models. In this work, we introduce a framework of tensor networks having a fermionic component capable of capturing notions of topological order. At the heart of the formalism are axioms of fermionic matrix product operator injectivity, stable under concatenation. Building upon that, we formulate a Grassmann number tensor network ansatz for the ground state of fermionic twisted quantum double models. A specific focus is put on the paradigmatic example of the fermionic toric code. This work shows that the program of describing topologically ordered systems using tensor networks carries over to fermionic models.

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