Locally optimal control of quantum systems with strong feedback.
Locally optimal control of quantum systems with strong feedback.
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DOI：
10.1103/physrevlett.101.230403
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发表时间：
2008-03
影响因子：
8.6
通讯作者：
A. Shabani;K. Jacobs
中科院分区：
文献类型：
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作者：
A. Shabani;K. Jacobs
对于高纯度的量子系统，我们找到了所有可观测到的，当连续监测时，最大限度地减少平均线性熵的瞬时。这使得我们可以得到所有具有强反馈的局部最优反馈协议，以及对于大小为N<；或=4的系统的最佳反馈协议的显式表达式。我们还证明了对于五元组，局部最优协议是具有等间隔本征值的观测值的最优协议，从而为三态系统提供了第一个完全最优的反馈协议。
For quantum systems with high purity, we find all observables that, when continuously monitored, maximize the instantaneous reduction in the average linear entropy. This allows us to obtain all locally optimal feedback protocols with strong feedback, and explicit expressions for the best such protocols for systems of size N < or =4. We also show that for a qutrit the locally optimal protocol is the optimal protocol for observables with equispaced eigenvalues, providing the first fully optimal feedback protocol for a 3-state system.