标题： 光学捕获铷钟跃迁的扩展相干时间 显示英文标题

标题： Extended coherence time on the clock transition of optically trapped Rubidium

摘要： 光学捕获的系综对于频率测量和量子存储器至关重要，但通常由于密度不均匀性和光频移而遭受强烈的去相位。 我们通过应用最近发现的自旋自重聚技术，在Rb-87的磁感应不灵敏钟跃迁上实现了相干时间的显著增加，达到21秒。 这一结果证实了这种新机制的普遍性，从而展示了其在原子钟和量子存储器中的适用性。 对所有相关频率漂移和噪声贡献的系统研究得出稳定性为2.4E-11 x tau^(-1/2)，其中tau是以秒为单位的积分时间。 基于一系列技术改进，所提出的频率标准预计在潜在更紧凑的设置中能够与微波喷泉钟的稳定性相媲美。 显示英文摘要

摘要： Optically trapped ensembles are of crucial importance for frequency measurements and quantum memories, but generally suffer from strong dephasing due to inhomogeneous density and light shifts. We demonstrate a drastic increase of the coherence time to 21 s on the magnetic field insensitive clock transition of Rb-87 by applying the recently discovered spin self-rephasing. This result confirms the general nature of this new mechanism and thus shows its applicability in atom clocks and quantum memories. A systematic investigation of all relevant frequency shifts and noise contributions yields a stability of 2.4E-11 x tau^(-1/2), where tau is the integration time in seconds. Based on a set of technical improvements, the presented frequency standard is predicted to rival the stability of microwave fountain clocks in a potentially much more compact setup.