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arXiv 0705.3456quant-phcond-mat.str-el
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模拟量子多体系统的统一变分方法

Unifying variational methods for simulating quantum many-body systems

Christopher M. Dawson, Jens Eisert, Tobias J. Osborne

摘要:

介绍了一种统一的变分方法,用于模拟量子多体系统的基态性质。其主要特点是一种新的变分方法,通过无穷小的酉变换,在量子线路,灵感来自流方程方法。变分类被表示为有效收缩的酉网络,包括密度矩阵重整化的矩阵乘积态、多尺度纠缠重整化(MERA)态、加权图态和量子元胞自动机。特别是,这提供了一种工具,用于改变状态的类别,如MERA,迄今为止还没有有效的变化方式。该计划在混合方法或制定新方法方面是灵活的。我们演示了MERA,矩阵产品状态,和一个新的变集基准的数值实现的功能。

英文摘要:

We introduce a unified formulation of variational methods for simulating ground state properties of quantum many-body systems. The key feature is a novel variational method over quantum circuits via infinitesimal unitary transformations, inspired by flow equation methods. Variational classes are represented as efficiently contractible unitary networks, including the matrix-product states of density matrix renormalization, multiscale entanglement renormalization (MERA) states, weighted graph states, and quantum cellular automata. In particular, this provides a tool for varying over classes of states, such as MERA, for which so far no efficient way of variation has been known. The scheme is flexible when it comes to hybridizing methods or formulating new ones. We demonstrate the functioning by numerical implementations of MERA, matrix-product states, and a new variational set on benchmarks.

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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