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arXiv 2507.02071quant-ph
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噪声增强的量子时钟与全局场传感器

Noise-enhanced quantum clocks and global field sensors

Luis Pedro García-Pintos

AI总结:

本文证明非相干动力学可通过为量子 Fisher 信息提供可加贡献而降低估计误差,并刻画了噪声增强时间间隔与频率估计的机制,展示了量子比特和光子传感器网络中的改进传感协议。

摘要:

我证明非相干动力学可以在量子传感中带来计量学优势。该结果基于以下事实:非相干动力学对关于时间的量子 Fisher 信息产生一个可加贡献。正如量子 Cramér-Rao 界所暗示的那样,这种可加贡献可以降低最优估计协议的误差。我刻画了时间间隔或频率的估计因噪声而得到增强的机制,从而识别出非相干动力学作为计量学资源的情形。我通过量子比特和光子传感器网络展示了对时间间隔或全局场具有改进传感能力的协议来加以说明。

英文摘要:

I show that incoherent dynamics can lead to metrological advantages in quantum sensing. The results rely on the fact that incoherent dynamics lead to an additive contribution to the quantum Fisher information about time. Such an additive contribution can lead to a decrease in the error of optimal estimation protocols, as implied by the quantum Cramér-Rao bound. I characterize regimes in which the estimation of a time interval or a frequency is enhanced by noise, thus identifying cases where incoherent dynamics serve as a metrological resource. I illustrate with protocols that display improved sensing of time intervals or global fields by qubit and photonic sensor networks.

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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