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arXiv 1003.0763quant-ph
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用于光频计量的线性多极阱中的离子环

An ion ring in a linear multipole trap for optical frequency metrology

Caroline Champenois, Mathieu Marciante, Jofre Pedregosa-Guttierez, Marie Houssin, Martina Knoop, Masatoshi Kajita

摘要:

研究了线性多极阱中离子的环形晶体作为光频标的基础。通过分析模型和分子动力学模拟讨论了平衡条件和冷却可能性。提出了一种降低对捕获离子数量波动的频率灵敏度的配置。钙离子的电四极跃迁的系统位移进行了评估,为这个环的配置。这项研究表明,10或20个离子的环允许达到比单个离子更好的短期稳定性,而不会引入限制性的长期波动。

英文摘要:

A ring crystal of ions trapped in a linear multipole trap is studied as a basis for an optical frequency standard. The equilibrium conditions and cooling possibilities are discussed through an analytical model and molecular dynamics simulations. A configuration which reduces the frequency sensitivity to the fluctuations of the number of trapped ions is proposed. The systematic shifts for the electric quadrupole transition of calcium ions are evaluated for this ring configuration. This study shows that a ring of 10 or 20 ions allows to reach a short term stability better than for a single ion without introducing limiting long term fluctuations.

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