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arXiv 1111.2847quant-ph
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开放量子系统的任务相关控制

Task-dependent control of open quantum systems

Jens Clausen, Guy Bensky, Gershon Kurizki

摘要:

我们发展了一个通用的优化策略,用于在开放量子系统上执行所选择的么正或非么正任务。我们的目标是通过变分最小化或最大化系统状态的选定函数来设计受控时间依赖系统哈密顿量,该函数量化了任务成功(分数),如保真度,纯度或纠缠度。如果系统哈密顿量的时间依赖性足够快,可以与浴的响应时间相比或更短,则所得到的非马尔可夫动力学被示出为将所选择的任务分数优化到浴的耦合中的二阶。这种策略可以保护所需的幺正系统演化免受浴诱导的退相干,但也可以利用系统-浴耦合,从而实现所需的非幺正效应的系统。

英文摘要:

We develop a general optimization strategy for performing a chosen unitary or non-unitary task on an open quantum system. The goal is to design a controlled time-dependent system Hamiltonian by variationally minimizing or maximizing a chosen function of the system state, which quantifies the task success (score), such as fidelity, purity, or entanglement. If the time-dependence of the system Hamiltonian is fast enough to be comparable or shorter than the response-time of the bath, then the resulting non-Markovian dynamics is shown to optimize the chosen task score to second order in the coupling to the bath. This strategy can protect a desired unitary system evolution from bath-induced decoherence, but ca also take advantage of the system-bath coupling so as to realize a desired non-unitary effect on the system.

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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