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在光学原子钟过渡上纠

Edwin Pedrozo-Peñafiel1, Simone Colombo1, Chi Shu1,2

  • 1Department of Physics, MIT-Harvard Center for Ultracold Atoms and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA, USA.

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概括

研究人员在光学时钟 (OLC) 中创建了多原子纠状态,实现了超出标准量子极限 (SQL) 的性能. 量子计量学的这一突破为未来的科学应用增强了原子钟的稳定性和精度.

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科学领域:

  • 量子计量学
  • 原子物理
  • 精确测量

背景情况:

  • 最先进的原子钟,包括光网时钟 (OLC),依赖于精确测量原子层之间的能量差异.
  • OLC稳定性受到局部振荡器激光噪声 (迪克噪声) 和测量量子噪声的标准量子极限 (SQL) 的限制.
  • 以前使用纠超越SQL的努力仅限于不太稳定的微波时钟,没有对光学时钟过渡的实验性演示.

研究的目的:

  • 通过实验证明光学格子时钟过渡的纠生成.
  • 使用这种纠状态来操作超出标准量子极限的光学晶格时钟.
  • 展示纠用于提高计时精度和准确性的潜力.

主要方法:

  • 创建一个多原子纠状态使用-171光学时钟过渡.
  • 使用纠原子组合实现Ramsey序列.
  • 测量艾伦偏差以评估时钟稳定性并与SQL进行比较.

主要成果:

  • 在考虑局部振荡器噪声后,证明了Ramsey序列在SQL以下的艾伦偏差.
  • 通过使用数百个-171原子的组合,在SQL上获得了[公式:参见文本]分贝的计量效果.
  • 由于纠,观察到平均时间缩短了2.8 ± 0.3,这表明时钟性能得到了提高.

结论:

  • 这项研究成功地证明了在OLC过渡中创建多原子纠状态,使其能够在SQL之外进行操作.
  • 纠提供了一个可行的途径,可以显著提高最先进的光学晶格时钟的性能.
  • 这种进步有望提高计时精度和准确性, 影响基本物理测试, 地测和引力波探测.