arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.05566cond-mat.str-elcond-mat.stat-mechhep-latquant-ph
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费米子和玻色手征拓扑物质中的内禀符号问题

Intrinsic sign problem in fermionic and bosonic chiral topological matter

Omri Golan, Adam Smith, Zohar Ringel

摘要:

在一般多体量子系统的蒙特卡罗模拟中,臭名昭著的符号问题导致了指数复杂性。尽管如此,物质的许多相都是已知的,可以接受无符号问题的代表,允许在经典计算机上进行有效的模拟。受多体物理学中长期存在的开放问题以及量子复杂性中的基本问题的启发,最近提出了内在符号问题的可能性,其中物质的一个阶段不允许无符号问题的代表,但在很大程度上尚未探索。在这里,我们建立了一个内在的符号问题的存在,在一个广泛的类间隙,手性,拓扑相的物质。在这一类中,我们排除了玻色子(或“量子”)的随机哈密顿的可能性,以及费米子的无符号问题的行列式蒙特卡罗算法。我们确定的本质上有符号问题的相位类定义在拓扑不变量与明确的可观察到的签名:手征中心荷,和拓扑自旋的任意子。我们得到类似的结果,自发手性相,并提出证据,我们的结果适用于手性和非手性拓扑物质的延伸。

英文摘要:

The infamous sign problem leads to an exponential complexity in Monte Carlo simulations of generic many-body quantum systems. Nevertheless, many phases of matter are known to admit a sign-problem-free representative, allowing efficient simulations on classical computers. Motivated by long standing open problems in many-body physics, as well as fundamental questions in quantum complexity, the possibility of intrinsic sign problems, where a phase of matter admits no sign-problem-free representative, was recently raised but remains largely unexplored. Here, we establish the existence of an intrinsic sign problem in a broad class of gapped, chiral, topological phases of matter. Within this class, we exclude the possibility of stoquastic Hamiltonians for bosons (or 'qudits'), and of sign-problem-free determinantal Monte Carlo algorithms for fermions. The intrinsically sign-problematic class of phases we identify is defined in terms of topological invariants with clear observable signatures: the chiral central charge, and the topological spins of anyons. We obtain analogous results for phases that are spontaneously chiral, and present evidence for an extension of our results that applies to both chiral and non-chiral topological matter.

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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