Poshakinskiy Alexander V, Poddubny Alexander N
Ioffe Institute, St. Petersburg 194021, Russia.
Phys Rev Lett. 2021 Oct 22;127(17):173601. doi: 10.1103/PhysRevLett.127.173601.
We theoretically study subradiant states in an array of atoms coupled to photons propagating in a one-dimensional waveguide focusing on the strongly interacting many-body regime with large excitation fill factor f. We introduce a generalized many-body entropy of entanglement based on exact numerical diagonalization followed by a high-order singular value decomposition. This approach has allowed us to visualize and understand the structure of a many-body quantum state. We reveal the breakdown of fermionized subradiant states with increase of f with the emergence of short-ranged dimerized antiferromagnetic correlations at the critical point f=1/2 and the complete disappearance of subradiant states at f>1/2.
我们从理论上研究了与在一维波导中传播的光子耦合的原子阵列中的亚辐射态，重点关注具有大激发填充因子f的强相互作用多体体系。我们基于精确数值对角化并结合高阶奇异值分解，引入了一种广义多体纠缠熵。这种方法使我们能够可视化并理解多体量子态的结构。我们揭示了随着f的增加，费米化亚辐射态的崩溃，在临界点f = 1/2处出现短程二聚化反铁磁关联，并且在f>1/2时亚辐射态完全消失。
