Multi-step evolution and measurement control of finite-dimensional quantum systems

Multi-step evolution and measurement control of finite-dimensional quantum systems
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有限维量子系统的多步演化与测量控制

DOI:
10.1007/s11434-012-5166-3
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发表时间:
2012-04
影响因子:
--
通讯作者:
LIU WenFeng
LIU WenFeng
中科院分区:
--
文献类型:
--
作者:
CHEN ZongHai;ZHANG ChenBin;LIU WenFeng

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对于有限维量子系统,我们提出了一种基于多步酉演化和量子射影测量的量子控制方案。目标是设计一种控制律,使系统以最少的步数引导到测量算子的目标特征状态。在每个控制步骤中,依次进行统一演化和量子投影测量,直到系统达到目标状态。控制过程可以建模为具有吸收态的有限状态马尔可夫链。我们证明了被控系统在有限步数的控制后以概率1收敛到目标特征态,并找到了一个最小步数条件,使系统在最少步数的控制下达到目标特征态。
For finite-dimensional quantum systems, we propose a quantum control scheme based on a multi-step unitary evolution and quantum projective measurements. The objective is to design a control law to steer the system to a target eigenstate of the measurement operator in the least number of steps. Within each control step, unitary evolution and quantum projective measurement are performed in turn until the system reaches the target state. The control process can be modeled as a finite-state Markov chain with an absorbing state. We prove that the controlled system will converge to the target eigenstate with probability one after a finite number of control steps and find a minimal-step-number condition that would steer the system to the target eigenstate in the least number of steps.
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