论文标题
在强烈相关的费米子链中目睹非平衡纠缠动态
Witnessing nonequilibrium entanglement dynamics in a strongly correlated fermionic chain
论文作者
论文摘要
可以通过使用纠缠证人和特定于操作员特定的量子界来从平衡响应函数中诊断出凝结物质系统中的多体纠缠。在这里，我们研究了这种方法在以平衡为驱动的量子系统中检测纠缠状态的适用性。我们使用多部分纠缠见证人量子渔民信息来研究经历了库仑相互作用时间变化的范式费物链的动力学。我们的结果表明，量子Fisher信息能够见证近距离和远离平衡的多部分纠缠的明显签名，这些纠缠均具有稳健性。我们讨论了这些发现对使用时间分辨的光学和X射线散射方法在轻驱动量子材料中探测纠缠的含义。
Many-body entanglement in condensed matter systems can be diagnosed from equilibrium response functions through the use of entanglement witnesses and operator-specific quantum bounds. Here, we investigate the applicability of this approach for detecting entangled states in quantum systems driven out of equilibrium. We use a multipartite entanglement witness, the quantum Fisher information, to study the dynamics of a paradigmatic fermion chain undergoing a time-dependent change of the Coulomb interaction. Our results show that the quantum Fisher information is able to witness distinct signatures of multipartite entanglement both near and far from equilibrium that are robust against decoherence. We discuss implications of these findings for probing entanglement in light-driven quantum materials with time-resolved optical and x-ray scattering methods.
