不可区分电子的纠缠见证:基于固态光谱学方法
Entanglement Witness for Indistinguishable Electrons using Solid-State Spectroscopy
AI总结:
本文提出利用共振非弹性X射线散射光谱的非线性提取四费米子关联,构建基于累积量双粒子约化密度矩阵的纠缠见证,可高效量化不可区分电子的多体纠缠,优于量子Fisher信息。
摘要:
表征量子材料中的纠缠对于推进下一代量子技术至关重要。尽管近年来在具有可区分自旋模式的磁性材料中见证纠缠取得了进展,但在由不可区分电子形成的系统中量化纠缠仍然是一个艰巨的挑战。为解决这一问题,我们引入了一种通过分析共振非弹性X射线散射光谱中的非线性来提取各种四费米子关联的方法。这些关联构成了累积量双粒子约化密度矩阵的主要组成部分。我们进一步推导了其特征值的界限,并展示了其与费米子纠缠深度的线性标度关系,从而提供了一种可靠的纠缠见证。以与材料相关的强关联模型为例,我们展示了这种纠缠见证如何在不同相区高效量化多体纠缠,凸显了其相对于量子Fisher信息的优势。
英文摘要:
Characterizing entanglement in quantum materials is crucial for advancing next-generation quantum technologies. Despite recent strides in witnessing entanglement in magnetic materials with distinguishable spin modes, quantifying entanglement in systems formed by indistinguishable electrons remains a formidable challenge. To solve this problem, we introduce a method to extract various four-fermion correlations by analyzing the nonlinearity in resonant inelastic x-ray scattering spectra. These correlations constitute the primary components of the cumulant two-particle reduced density matrix. We further derive bounds for its eigenvalues and demonstrate the linear scaling with fermionic entanglement depth, providing a reliable witness for entanglement. Using the material-relevant strongly correlated models as examples, we show how this entanglement witness can efficiently quantify multipartite entanglement across different phase regions, highlighting its advantage over quantum Fisher information.
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