We describe a protocol to prepare solitons in a quasi-one-dimensional (quasi-1D) box-trapped Bose-Einstein condensate using a quench of the isotropic $s$-wave scattering length. A quench to exactly four times the initial 1D coupling strength creates one soliton at each boundary of the box, which then propagate in a uniform background density and collide with one another. In the ideal case, no nonsolitonic excitations are created during the quench. The procedure is robust against realistic box shapes, imperfections in the scattering length ramp rate, and a mismatch of the final scattering length. We simulate the condensate in full 3D and propose a modification to the protocol that is effective outside of the strict quasi-1D regime.

中文翻译：

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盒式玻色-爱因斯坦凝聚物中淬火产生的孤子

我们描述了一种使用各向同性猝灭法在准一维（拟1D）盒形陷获的玻色-爱因斯坦凝聚物中制备孤子的协议 $s$-波散射长度。淬火至初始一维耦合强度的四倍，在盒子的每个边界处创建一个孤子，然后以均匀的背景密度传播并相互碰撞。在理想情况下，淬火期间不会产生非孤子激发。该程序可抵抗实际的盒子形状，散射长度斜率的缺陷以及最终散射长度的不匹配。我们在全3D模式下模拟凝结水，并提出对协议的修改，该修改在严格的准1D机制之外有效。