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arXiv 1305.6403quant-ph
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量子速度极限下的驾驶:两能级系统的最优控制

Driving at the quantum speed limit: Optimal control of a two-level system

Gerhard C. Hegerfeldt

摘要:

一个非常简单的结果,得出了所需的最小时间$T_{\rm min}$驱动一个一般的初始状态的最终目标状态的朗道-齐纳型哈密顿量,或等效地,由时间相关的激光驱动。还导出了相关的协议。当假设相互作用强度由一个常数$c$限定时,某些状态会出现令人惊讶的结果。然后,对于大的$c$,最优驱动是bang-off-bang类型,并且对于增大的$c$,恢复无约束结果。然而,对于较小的$c$,最佳驾驶可能会突然切换到砰砰式。我们讨论了量子速度极限时间的概念。

英文摘要:

A remarkably simple result is derived for the minimal time $T_{\rm min}$ required to drive a general initial state to a final target state by a Landau-Zener type Hamiltonian or, equivalently, by time-dependent laser driving. The associated protocol is also derived. A surprise arises for some states when the interaction strength is assumed to be bounded by a constant $c$. Then, for large $c$, the optimal driving is of type bang-off-bang and for increasing $c$ one recovers the unconstrained result. However, for smaller $c$ the optimal driving can suddenly switch to bang-bang type. We discuss the notion of quantum speed limit time.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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