Optimized geometries for future generation optical lattice clocks
Optimized geometries for future generation optical lattice clocks
复制标题
用于下一代光学晶格钟的优化几何结构
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
H. Ritsch
中科院分区：
文献类型：
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作者：
S. Krämer;L. Ostermann;H. Ritsch
深陷在魔波长光学晶格中的原子为高精度光谱学提供了理想的无多普勒和无碰撞的量子发射器密集系综，它们是迄今为止一些最好的光学原子钟的基础。然而，尽管它们的微小的光学偶极矩，这种晶格中固有的长程偶极-偶极相互作用仍然产生线位移、失相和修改的衰减。我们表明，在一个完全填充的晶格线的位移和衰减共振增强依赖于晶格常数和几何形状。潜在地，这产生许多原子线宽的时钟偏移，并通过优化晶格几何形状来减少测量。这样的集体效应可以被定制为产生零有效位移，并延长偶极寿命超过单原子衰变。特别是，我们确定密集的2D六边形或正方形晶格作为最有前途的配置的准确性和精度远低于独立合奏限制。这种几何形状也应该是相关应用的理想基础，如超辐射激光，精密磁力测量或长寿命量子存储器。
Atoms deeply trapped in magic wavelength optical lattices provide a Doppler- and collision-free dense ensemble of quantum emitters ideal for high-precision spectroscopy and they are the basis of some of the best optical atomic clocks to date. However, despite their minute optical dipole moments the inherent long-range dipole-dipole interactions in such lattices still generate line shifts, dephasing and modified decay. We show that in a perfectly filled lattice line shifts and decay are resonantly enhanced depending on the lattice constant and geometry. Potentially, this yields clock shifts of many atomic linewidths and reduces the measurement by optimizing the lattice geometry. Such collective effects can be tailored to yield zero effective shifts and prolong dipole lifetimes beyond the single-atom decay. In particular, we identify dense 2D hexagonal or square lattices as the most promising configurations for an accuracy and precision well below the independent ensemble limit. This geometry should also be an ideal basis for related applications such as superradiant lasers, precision magnetometry or long-lived quantum memories.