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arXiv 1210.5477cond-mat.str-elquant-ph
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亚辛任意子、马约拉纳零模及其计算能力

Metaplectic Anyons, Majorana Zero Modes, and their Computational Power

Matthew B. Hastings, Chetan Nayak, Zhenghan Wang

摘要:

我们介绍和研究一类任意子模型,是一个自然的推广伊辛任意子和马约拉纳费米子零模式。这些模型结合了一个伊辛任意子部门与$SO(m)_2$陈-西蒙斯理论相关的部门。我们展示了它们是如何在一个简单的情况下产生电子分馏,并给出了它们的准粒子类型,融合规则和编织的完整说明。我们证明了对于$2n$基本准粒子的集合,辫子群的象是有限的,并且是$Sp(2n-2,\mathbb{F}_m)\ltimes H(2n-2,\mathbb{F}_m)$的亚群表示的真子群,其中$Sp(2n-2,\mathbb{F}_m)$是有限域$\mathbb{F}_m$上的辛群,$H(2n-2,\mathbb{F}_m)$是$\mathbb{F}_m$上的额外特殊群(也称为$(2n-1)$维海森堡群).此外,编织的基本准粒子可以有效地模拟经典。然而,计算编织某种类型的复合准粒子的结果是$# P$ -困难的,尽管它对于量子计算不是通用的,因为它具有有限的编织群图像。这是一个罕见的拓扑阶段的例子,该阶段对于通过编织的量子计算来说并不通用,但仍然具有$# P$ -硬链接不变量。我们认为,我们的模型是密切相关的,最近的分析发现非阿贝尔的任何性质的量子霍尔系统中的缺陷,推广马约拉纳零模式准一维系统。

英文摘要:

We introduce and study a class of anyon models that are a natural generalization of Ising anyons and Majorana fermion zero modes. These models combine an Ising anyon sector with a sector associated with $SO(m)_2$ Chern-Simons theory. We show how they can arise in a simple scenario for electron fractionalization and give a complete account of their quasiparticles types, fusion rules, and braiding. We show that the image of the braid group is finite for a collection of $2n$ fundamental quasiparticles and is a proper subgroup of the metaplectic representation of $Sp(2n-2,\mathbb{F}_m)\ltimes H(2n-2,\mathbb{F}_m)$, where $Sp(2n-2,\mathbb{F}_m)$ is the symplectic group over the finite field $\mathbb{F}_m$ and $H(2n-2,\mathbb{F}_m)$ is the extra special group (also called the $(2n-1)$-dimensional Heisenberg group) over $\mathbb{F}_m$. Moreover, the braiding of fundamental quasiparticles can be efficiently simulated classically. However, computing the result of braiding a certain type of composite quasiparticle is $# P$-hard, although it is not universal for quantum computation because it has a finite braid group image. This a rare example of a topological phase that is not universal for quantum computation through braiding but nevertheless has $# P$-hard link invariants. We argue that our models are closely related to recent analyses finding non-Abelian anyonic properties for defects in quantum Hall systems, generalizing Majorana zero modes in quasi-1D systems.

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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