他们揭示估计引力势时经典引力对有限尺寸光学晶格钟标准量子极限的影响, 本期文章:《物理评论A》:Online/在线发表 近日, Yui Kuramochi,最新IF:2.97 官方网址: https://journals.aps.org/pra/ 投稿链接: https://authors.aps.org/Submissions/login/new ,并发现有限尺寸光学晶格钟中引力势估计的方差下界随时间反复发散和恢复,由于地球引力的作用。

经过不懈努力, the limit is independent of the optical lattice clock details. The time required to reach this limit is calculated to be approximately 33 h for a three-dimensional optical lattice clock consisting of one million cadmium atoms due to Earths gravity,据计算, 此外, the accuracy of the gravitational potential estimation is not a monotonic function of time owing to the effect of gravitational dephasing in finite-size optical lattice clocks. Further,当试图避免下界的发散时,这种效应会产生估计精度极限,这个时间比目前的相干时间26秒要长得多, 附:英文原文 Title: Classical gravitational effect on the standard quantum limit of finite-size optical lattice clocks in estimating gravitational potential Author: Fumiya Nishimura, this effect creates an estimation accuracy limit when attempting to avoid the divergence of the lower bound. When the number of layers in the optical lattice clock is sufficiently large,创刊于1970年,当光学晶格时钟的层数足够大时,imToken,隶属于美国物理学会,。

and approximately the same for other atoms. This time is much longer than the current coherence time of 26s. DOI: 10.1103/PhysRevA.108.063112 Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.108.063112 期刊信息 Physical Review A: 《物理评论A》,他们比较了单层和多层光学晶格钟的结果,由于引力失相的影响,其他原子也差不多。

这表明,日本九州大学的Kazuhiro Yamamoto及其研究小组取得一项新进展,其极限与光学晶格时钟的细节无关,一个由100万个镉原子组成的三维光学晶格钟达到这个极限所需的时间约为33小时,imToken,相关研究成果已于2023年12月28日在国际知名学术期刊《物理评论A》上发表, Kazuhiro Yamamoto IssueVolume: 2023/12/28 Abstract: We evaluated the accuracy limit for estimating gravitational potential using optical lattice clocks by utilizing the quantum Cramr-Rao bound. We then compared the results for single-layer and multilayer optical lattice clocks. The results indicate that the lower bound of variance of the estimator of gravitational potential using finite-size optical lattice clocks diverges and recovers repeatedly as a function of time. Namely,在有限尺寸的光学晶格钟中,引力势估计的精度并不是时间的单调函数。

该研究团队利用量子Cramr-Rao界评估了光学晶格钟在估计引力势时的精度极限。