论文标题
在被困的离子中，复合脉冲ramsey光谱违反洛伦兹的界限改善了界限
Improved bounds on Lorentz violation from composite-pulse Ramsey spectroscopy in a trapped ion
论文作者
论文摘要
为了在单个量子一致的理论中统一四个已知的基本力量，建议洛伦兹对称性在普朗克量表上可能被打破。在这里，我们通过比较米歇尔森 - 莫利型实验中的正交原子轨道，在低能极限下搜索洛伦兹违规行为。我们在yb $^+$ ion的$^2f_ {7/2} $歧管中应用强大的射频复合脉冲序列，将连贯时间从200 $μ$ s扩展到超过1 s。通过这种方式，我们完全利用了$^2f_ {7/2} $状态的高内在敏感性，并利用其异常长的寿命。我们将以前最佳Lorentz对称测试的稳定性匹配几乎更快的数量级，并将对称性破坏系数的约束提高到10 $^{ - 21} $ evelp。这些结果代表了这种类型的洛伦兹违规的最严格测试。所证明的方法可以进一步扩展到离子库仑晶体。
In attempts to unify the four known fundamental forces in a single quantum-consistent theory, it is suggested that Lorentz symmetry may be broken at the Planck scale. Here we search for Lorentz violation at the low-energy limit by comparing orthogonally oriented atomic orbitals in a Michelson-Morley-type experiment. We apply a robust radiofrequency composite pulse sequence in the $^2F_{7/2}$ manifold of an Yb$^+$ ion, extending the coherence time from 200 $μ$s to more than 1 s. In this manner, we fully exploit the high intrinsic susceptibility of the $^2F_{7/2}$ state and take advantage of its exceptionally long lifetime. We match the stability of the previous best Lorentz symmetry test nearly an order of magnitude faster and improve the constraints on the symmetry breaking coefficients to the 10$^{-21}$ level. These results represent the most stringent test of this type of Lorentz violation. The demonstrated method can be further extended to ion Coulomb crystals.
