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51132000032

木虫 (初入文坛)

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Optical lattice clocks with extremely stable frequency are possible when many atoms are
interrogated simultaneously, but this precision may come at the cost of systematic inaccuracy
resulting from atomic interactions. Density-dependent frequency shifts can occur even in a clock
that uses fermionic atoms if they are subject to inhomogeneous optical excitation. However,
sufficiently strong interactions can suppress collisional shifts in lattice sites containing more
than one atom. We demonstrated the effectiveness of this approach with a strontium lattice clock
by reducing both the collisional frequency shift and its uncertainty to the level of 10−17. This
result eliminates the compromise between precision and accuracy in a many-particle system;
both will continue to improve as the number of particles increases.
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yiming_0

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RXMCDM: 金币+13 2014-06-12 22:26:42
RXMCDM: 金币-12 2014-06-12 22:26:52
51132000032: 金币+12, 翻译EPI+1 2014-06-14 09:06:38
当部分原子被同步诊断时,频率极其稳定的光晶格钟是可能存在的,但是由于原子间的相互作用,它会导致系统性的不精确。在不均匀光激发的情况下,即使应用费米原子的光晶格钟,密度依赖的频率也会发生变化。然而,充分的强相互作用能够抑制在包含多于一个原子晶格位点的碰撞变化。通过减少锶晶格钟的碰撞频率变化和它在10-17水平中的不确定性,我们证实了这种方法的有效性。这个结果忽略了多粒子系统的精度和准确性的损失,但随着粒子数量的增长,两者精度均会有所提高
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2楼2014-06-12 09:21:21
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