arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1902.01097quant-ph
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海森堡极限下广义量子参数估计的控制增强序贯方案

Control-enhanced sequential scheme for general quantum parameter estimation at the Heisenberg limit

Zhibo Hou, Rui-Jia Wang, Jun-Feng Tang, Haidong Yuan, Guo-Yong Xiang, Chuan-Feng Li, Guang-Can Guo

摘要:

量子精密测量的优点已经在实验上证明了相位估计的动力学是交换的。然而,一般的非交换动力学可以有不同的特征。例如,直接顺序方案,它可以实现海森堡缩放的相位估计下的交换动力学,可以有甚至更差的性能比经典的计划下的非交换动力学。在这里,我们实现了一个可扩展的最优控制的顺序计划,它可以达到海森堡精度下一般的非交换动力学。我们还提出了一个直观的几何框架的控制方案,并确定甜蜜点的时间,在该计划中使用的最佳控制可以预先固定而无需适应,这大大简化了实验协议。我们成功地实现了该计划的八个控制在一个光学平台,证明了海森堡极限附近的精度。我们的工作为在量子精密测量中收获量子控制的力量开辟了道路,并提供了一个控制增强的配方,以实现一般非对易动力学下的海森堡精度。

英文摘要:

The advantage of quantum metrology has been experimentally demonstrated for phase estimations where the dynamics are commuting. General noncommuting dynamics, however, can have distinct features. For example, the direct sequential scheme, which can achieve the Heisenberg scaling for the phase estimation under commuting dynamics, can have even worse performances than the classical scheme under noncommuting dynamics. Here we realize a scalable optimally controlled sequential scheme, which can achieve the Heisenberg precision under general noncommuting dynamics. We also present an intuitive geometrical framework for the controlled scheme and identify sweet spots in time at which the optimal controls used in the scheme can be pre-fixed without adaptation, which simplifies the experimental protocols significantly. We successfully implement the scheme up to eight controls in an optical platform, demonstrate a precision near the Heisenberg limit. Our work opens the avenue for harvesting the power of quantum control in quantum metrology, and provides a control-enhanced recipe to achieve the Heisenberg precision under general noncommuting dynamics.

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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