无序耦合的相长干涉增强量子海森堡自旋玻璃模型中的多方纠缠
Constructive Interference Between Disordered Couplings Enhances Multiparty Entanglement in Quantum Heisenberg Spin Glass Models
摘要：
无序系统是许多人体科学研究的中心环节之一，并导致了大量有趣的现象和应用。范例无序系统由自旋为1/2的量子粒子的一维阵列组成，由海森堡自旋玻璃哈密顿量控制，在外部磁场中具有自然或工程猝灭的无序耦合。这些系统允许无序诱导增强的二分和多分可观。在这里，我们表明，同时应用独立的淬火无序的结果在无序诱导的增强，而同样的是缺乏与个别应用相同的疾病。我们称这种现象为相长干涉，相应的参数拉伸为金星区域。有趣的是，它只在多方纠缠中被观察到，而在单方和两方物理量中却没有。
英文摘要：
Disordered systems form one of the centrestages of research in many body sciences and lead to a plethora of interesting phenomena and applications. A paradigmatic disordered system consists of an one-dimensional array of quantum spin-1/2 particles, governed by the Heisenberg spin glass Hamiltonian with natural or engineered quenched disordered couplings in an external magnetic field. These systems allow disorder-induced enhancement for bipartite and multipartite observables. Here we show that simultaneous application of independent quenched disorders results in disorder-induced enhancement, while the same is absent with individual application of the same disorders. We term the phenomenon as constructive interference and the corresponding parameter stretches as the Venus regions. Interestingly, it has only been observed for multiparty entanglement and is absent for the single- and two-party physical quantities.
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