论文标题
通过均匀的抗铁磁量子自旋链中的量子Fisher信息实现多部分纠缠的实验性实现
Experimental realisation of multipartite entanglement via quantum Fisher information in a uniform antiferromagnetic quantum spin chain
论文作者
论文摘要
量子纠缠是一种量子机械现象，其中，具有多个自由度的多体系统的量子状态不能独立于每个人的自由度独立地描述，无论每个人的太空之间的距离有多远。纠缠不仅被视为量子信息中的资源，而且还被认为会影响复杂的凝结物质系统。因此，在多体系统中检测和量化多粒子纠缠对于量子信息科学和凝结物理物理学都具有基本意义。在这里，我们在散装固体中检测并量化了自旋1/2海森贝格抗铁磁链中的多部分纠缠。使用量子渔民信息检测到多部分纠缠，该信息是使用通过非弹性中子散射测得的动态敏感性获得的。发现量子Fisher信息的缩放行为可确定旋转1/2海森贝格抗铁磁链，属于具有不同多部分纠缠的一类强纠缠量子相变。
Quantum entanglement is a quantum mechanical phenomenon where the quantum state of a many-body system with many degrees of freedom cannot be described independently of the state of each body with a given degree of freedom, no matter how far apart in space each body is. Entanglement is not only considered a resource in quantum information but also believed to affect complex condensed matter systems. Detecting and quantifying multi-particle entanglement in a many-body system is thus of fundamental significance for both quantum information science and condensed matter physics. Here, we detect and quantify multipartite entanglement in a spin 1/2 Heisenberg antiferromagnetic chain in a bulk solid. Multipartite entanglement was detected using quantum Fisher information which was obtained using dynamic susceptibility measured via inelastic neutron scattering. The scaling behaviour of quantum Fisher information was found to identify the spin 1/2 Heisenberg antiferromagnetic chain to belong to a class of strongly entangled quantum phase transitions with divergent multipartite entanglement.
