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arXiv 2204.03124cond-mat.stat-mech
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障碍物穿越的有效二维控制

Efficient two-dimensional control of barrier crossing

Steven Blaber, David A. Sivak

摘要:

驱动势垒穿越在光阱实验和操纵分子动力学模拟中是普遍存在的。尽管控制的保真度很高,但很少利用选择驱动协议的自由来提高效率。我们设计的协议,减少耗散的快速驱动的障碍跨越下的二维控制的谐波捕获潜力,控制陷阱中心和刚度。对于快速驾驶,最小耗散协议在控制参数端点之间中途跳转。对于慢驱动,最小耗散协议一般减慢并收紧陷阱,因为它穿过屏障,导致显着的能量节省和增加的流量相比,天真和一维协议(只改变陷阱中心)。结合快速和缓慢的结果,我们设计的协议,提高性能在所有速度。

英文摘要:

Driven barrier crossings are pervasive in optical-trapping experiments and steered molecular-dynamics simulations. Despite the high fidelity of control, the freedom in the choice of driving protocol is rarely exploited to improve efficiency. We design protocols that reduce dissipation for rapidly driven barrier crossing under two-dimensional control of a harmonic trapping potential, controlling both trap center and stiffness. For fast driving, the minimum-dissipation protocol jumps halfway between the control-parameter endpoints. For slow driving, the minimum-dissipation protocol generically slows down and tightens the trap as it crosses the barrier, resulting in both significant energy savings and increased flux compared to naive and one-dimensional protocols (that only change trap center). Combining fast and slow results, we design protocols that improve performance at all speeds.

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