论文标题
生产和表征碎片的纺纱厂冷凝水
Production and characterization of a fragmented spinor Bose-Einstein condensate
论文作者
论文摘要
了解多体流体的基态是统计物理学的核心问题。通常，对于弱相互作用的玻璃气体，大多数颗粒占据相同的状态，对应于玻色 - 国家凝结物。但是，在几种宏观占人群的单粒子状态的出现时可能会发生另一种情况。到目前为止，由于对外部扰动的脆弱性，对这种零散状态的观察仍然难以捉摸。在这里，我们生产出3片凝结物，用于$ \ sim 100 $原子的自旋1气体，具有抗铁磁相互作用和消失的集体自旋。使用接近单原子分辨率的自旋分辨检测，我们表明重建的多体状态是准之前的，而一体可观察的物体对应于混合状态。我们的结果突出了对称性与相互作用之间的相互作用，以在量子系统中发展纠缠。
Understanding the ground state of many-body fluids is a central question of statistical physics. Usually for weakly interacting Bose gases, most particles occupy the same state, corresponding to a Bose--Einstein condensate. However, another scenario may occur with the emergence of several, macroscopically populated single-particle states. The observation of such fragmented states remained elusive so far, due to their fragility to external perturbations. Here we produce a 3-fragment condensate for a spin 1 gas of $\sim 100$ atoms, with anti-ferromagnetic interactions and vanishing collective spin. Using a spin-resolved detection approaching single-atom resolution, we show that the reconstructed many-body state is quasi-pure, while one-body observables correspond to a mixed state. Our results highlight the interplay between symmetry and interaction to develop entanglement in a quantum system.
