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arXiv 2005.13543quant-phcond-mat.quant-gascond-mat.str-el
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来自随机测量的统计相关性的多体陈氏数

Many-body Chern number from statistical correlations of randomized measurements

Ze-Pei Cian, Hossein Dehghani, Andreas Elben, Benoît Vermersch, Guanyu Zhu, Maissam Barkeshli, Peter Zoller, Mohammad Hafezi

摘要:

表征几个拓扑有序相的主要拓扑不变量之一是多体陈数(MBCN)。典型的例子包括几个分数量子霍尔相位,预计将在不久的将来在不同的原子和光子量子平台上实现。该不变量的实验测量和数值计算通常基于线性响应技术,该技术需要访问作为外部参数的函数的一系列状态,这不适合许多量子模拟器。在这里,我们提出了一个无附属物的实验方案测量这个不变量,而不需要任何知识的哈密顿量。具体来说,我们使用随机测量的统计相关性来推断波函数的MBCN。值得注意的是,我们的结果适用于更适合当前量子模拟器架构的盘状几何结构。

英文摘要:

One of the main topological invariants that characterizes several topologically-ordered phases is the many-body Chern number (MBCN). Paradigmatic examples include several fractional quantum Hall phases, which are expected to be realized in different atomic and photonic quantum platforms in the near future. Experimental measurement and numerical computation of this invariant is conventionally based on the linear-response techniques which require having access to a family of states, as a function of an external parameter, which is not suitable for many quantum simulators. Here, we propose an ancilla-free experimental scheme for the measurement of this invariant, without requiring any knowledge of the Hamiltonian. Specifically, we use the statistical correlations of randomized measurements to infer the MBCN of a wavefunction. Remarkably, our results apply to disk-like geometries that are more amenable to current quantum simulator architectures.

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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