标题： 非局域耦合量子电路中束缚态动力学的异常减速 显示英文标题

标题： Anomalous slow-down of the bound state dynamics in a non-locally coupled quantum circuit

摘要： 在紧束缚晶格中，额外的跳跃通道被证明会引入量子力学粒子更快的动力学行为。然而，我们表明，在排斥性束缚态的情况下，当允许粒子发生次近邻（NNN）跳跃时，动力学会变得异常缓慢。我们证明了这种减速现象发生在NNN跳跃的某些魔法强度下，此时束缚态能带表现出准平带特征。通过分析铁磁链上最近邻（NN）自旋激发（磁振子）的淬火动力学，同时考虑NN和NNN耦合，我们揭示了这种反常的动力学行为。通过在NISQ设备上实施数字量子计算模拟，我们获得了这些非平凡的特征，并用精确的数值计算补充了结果。此外，通过微扰论据，我们揭示了减速的原因是与束缚态动力学相关的不同路径之间的破坏性干涉。 显示英文摘要

摘要： Additional hopping channels in a tight-binding lattice is known to introduce faster dynamics of a quantum mechanical particle. However, we show that in the case of a repulsively bound state, the dynamics becomes abnormally slow when next-nearest neighbor (NNN) hopping is allowed for the particles. We show that such slowing down occurs for some magic strength of the NNN hopping at which the bound state band exhibits a quasi-flatband feature. We reveal this anomalous dynamical behavior by analyzing the quench dynamics of two nearest neighbor (NN) spin excitations (magnons) on a ferromagnetic chain by allowing both NN and NNN couplings. By implementing digital quantum computing simulations on a NISQ device, we obtain such non-trivial signatures and complement the results with exact numerical calculations. Moreover, through perturbative arguments, we reveal that the slowing down is due to the destructive interference between different paths associated to the bound state dynamics.