论文标题
实验确定锶时钟过渡的E2-M1极化性
Experimental determination of the E2-M1 polarizability of the strontium clock transition
论文作者
论文摘要
要以低于$ 10^{ - 17} $的分数不确定性操作光学晶格时钟，通常必须不仅要考虑原子和晶格光场之间的电动 - 偶极子（E1）相互作用，而表征所得的晶格过渡的晶格光转移，而且还需要较高的多个级数贡献，例如电力Quadrupole（E2）和Magneter-Magneter（E2）和Mpainte-nagement（E2）。但是，已经报告了对时钟的E2-m1极化差的强烈不相容的值。物理。莱特牧师。 121 263202（2018）; Porsev等人，物理。莱特牧师。 120，063204（2018）]。这在很大程度上排除了不确定性的运行时钟，而不确定性为$ 10^{ - 18} $，因为在典型的陷阱深度下，由此产生的晶格光移校正偏离了$ 1 \ times 10^{ - 17} $。我们已经使用$ {}^{87} \ mathrm {srm {sr} $ lattice时钟测量了E2-M1的极化差，并找到$Δα_ {\ Mathrm {qm Mathrm {qm}} = -987^{+174} {+174} _ { - 223} _ { - 223} \; \ Mathrm {μHz} $。该结果与Ushijima等人报告的价值非常吻合。
To operate an optical lattice clock at a fractional uncertainty below $10^{-17}$, one must typically consider not only electric-dipole (E1) interaction between an atom and the lattice light field when characterizing the resulting lattice light shift of the clock transition but also higher-order multipole contributions, such as electric-quadrupole (E2) and magnetic-dipole (M1) interactions. However, strongly incompatible values have been reported for the E2-M1 polarizability difference of the clock states $(5s5p)\,{}^{3}\mathrm{P}_{0}$ and $(5s^2)\,{}^{1}\mathrm{S}_{0}$ of strontium [Ushijima et al., Phys. Rev. Lett. 121 263202 (2018); Porsev et al., Phys. Rev. Lett. 120, 063204 (2018)]. This largely precludes operating strontium clocks with uncertainties of few $10^{-18}$, as the resulting lattice light shift corrections deviate by up to $1 \times 10^{-17}$ from each other at typical trap depths. We have measured the E2-M1 polarizability difference using our ${}^{87}\mathrm{Sr}$ lattice clock and find a value of $Δα_{\mathrm{qm}} = -987^{+174}_{-223} \; \mathrm{μHz}$. This result is in very good agreement with the value reported by Ushijima et al.
