Performance of a 229Thorium solid-state nuclear clock
Performance of a 229Thorium solid-state nuclear clock
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DOI：
10.1088/1367-2630/14/8/083019
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发表时间：
2012-08-17
影响因子：
3.3
通讯作者：
Schumm, T.
中科院分区：
文献类型：
--
作者：
Kazakov, G. A.;Litvinov, A. N.;Schumm, T.
在一种新型光学频率标准中，(229)Th的7.8 eV核同质异能跃迁被认为是一种时钟跃迁。在这里，我们讨论了用在真空紫外光范围内透明的单晶中注入的钍原子核来构建一个‘固态核钟’。我们研究了特定的氟化钙体系的晶体诱导线移和展宽效应。在液氮温度下，由于钍核与相邻核矩的磁耦合，时钟的性能将受到消相干的限制，从而排除了常用的Rabi或Ramsey询问方案。我们提出了基于荧光光谱方法的时钟稳定方法，并给出了优化的操作参数。利用在连续询问下的大量量子振子，在固态方法中可能达到10(-19)的分数不稳定水平。
The 7.8 eV nuclear isomer transition in (229)thorium has been suggested as a clock transition in a new type of optical frequency standard. Here we discuss the construction of a 'solid-state nuclear clock' from thorium nuclei implanted into single crystals transparent in the vacuum ultraviolet range. We investigate crystal-induced line shifts and broadening effects for the specific system of calcium fluoride. At liquid nitrogen temperatures, the clock performance will be limited by decoherence due to magnetic coupling of the thorium nuclei to neighboring nuclear moments, ruling out the commonly used Rabi or Ramsey interrogation schemes. We propose clock stabilization based on a fluorescence spectroscopy method and present optimized operation parameters. Taking advantage of the large number of quantum oscillators under continuous interrogation, a fractional instability level of 10(-19) might be reached within the solid-state approach.