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arXiv 2501.18673quant-ph
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激发量子振子的长度尺度估计

Length scale estimation of excited quantum oscillators

Los Alamos National Laboratory(洛斯阿拉莫斯国家实验室)

Tyler Volkoff, Giri Gopalan

AI总结:

本文研究大质量量子振子长度尺度参数的量子估计,证明位移压缩态和激发本征态可实现海森堡标度,并构造纠缠态序列以提升灵敏度。

摘要:

大质量量子振子在基于高精度量子传感器和弱力干涉检测的提案中正获得越来越多的应用。尽管对大质量量子振子某些性质(如相移和位移)的最优估计在电磁场的量子估计理论中有严格对应,但大质量振子的相空间各向异性由一个长度尺度参数表征,该参数是量子估计方法的独立目标。我们证明,大质量振子的位移压缩态和激发本征态在长度尺度的量子Fisher信息上相对于激发数表现出海森堡标度,并讨论了实现预测灵敏度的渐近无偏且高效的估计。我们构造了一个由两个大质量振子组成的纠缠态序列,该序列在长度尺度灵敏度上提供的提升相当于向非纠缠系统添加第三个大质量振子,以及一个由$N$个振子组成的态,该态相对于总能量表现出海森堡标度。

英文摘要:

Massive quantum oscillators are finding increasing applications in proposals for high-precision quantum sensors and interferometric detection of weak forces. Although optimal estimation of certain properties of massive quantum oscillators such as phase shifts and displacements have strict counterparts in the theory of quantum estimation of the electromagnetic field, the phase space anisotropy of the massive oscillator is characterized by a length scale parameter that is an independent target for quantum estimation methods. We show that displaced squeezed states and excited eigenstates of a massive oscillator exhibit Heisenberg scaling of the quantum Fisher information for the length scale with respect to excitation number, and discuss asymptotically unbiased and efficient estimation allowing to achieve the predicted sensitivity. We construct a sequence of entangled states of two massive oscillators that provides a boost in length scale sensitivity equivalent to appending a third massive oscillator to a non-entangled system, and a state of $N$ oscillators exhibiting Heisenberg scaling with respect to the total energy.

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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