Microscopic Study on Superexchange Dynamics of Composite Spin-1 Bosons.

An Luo,Yong-Guang Zheng,Wei-Yong Zhang,Mingyuan He,Ying-Chao Shen,Zi-Hang Zhu,Zhen-Sheng Yuan,Jian-Wei Pan

Published 2024 in Physical Review Letters

ABSTRACT

We report on an experimental simulation of the spin-1 Heisenberg model with composite bosons in a one-dimensional chain based on the two-component Bose-Hubbard model. Exploiting our site- and spin-resolved quantum gas microscope, we observed faster superexchange dynamics of the spin-1 system compared to its spin-1/2 counterpart, which is attributed to the enhancement effect of multi-bosons. We further probed the nonequilibrium spin dynamics driven by the superexchange and single-ion anisotropy terms, unveiling the linear expansion of the spin-spin correlations, which is limited by the Lieb-Robinson bound. Based on the superexchange process, we prepared and verified the entangled qutrits pairs with these composite spin-1 bosons, potentially being applied in qutrit-based quantum information processing.

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