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arXiv · 2510.10050

Quantum many-body analysis of spin-2 bosons with two-body inelastic decay

Takeshi Takahashi·Hiroki Saito
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Abstract

Bose-Einstein condensates of $^{87}\mathrm{Rb}$ atoms with a hyperfine spin of 2 are open quantum systems, where the atoms are lost through two-body inelastic collisions. In this dissipation process, a collision channel with total spin of 4 is forbidden by angular momentum conservation, which results in magnetization of the atoms remaining in the condensate. Here, we investigate the quantum many-body properties of spin-2 bosons that undergo two-body atomic loss. We show that the system finally reaches a steady state, which is a mixture of the states with maximum total spins. In addition, we find that a nonclassical steady state can be obtained by applying and quenching the quadratic Zeeman field.

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Takeshi Takahashi, Hiroki Saito. 2025-10-11. Quantum many-body analysis of spin-2 bosons with two-body inelastic decay. https://arxiv.org/abs/2510.10050

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