Long Rotational Coherence Times of Molecules in a Magnetic Trap.
Long Rotational Coherence Times of Molecules in a Magnetic Trap.
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DOI：
10.1103/physrevlett.124.063001
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发表时间：
2019-08
影响因子：
8.6
通讯作者：
L. Caldwell;H. Williams;N. Fitch;J. Aldegunde;J. Hutson;B. Sauer;M. Tarbutt
中科院分区：
文献类型：
--
作者：
L. Caldwell;H. Williams;N. Fitch;J. Aldegunde;J. Hutson;B. Sauer;M. Tarbutt
旋转态叠加的极性分子表现出长程偶极相互作用，但在捕获的样品中保持它们的相干性是一个挑战。我们目前的计算表明，许多激光冷却分子有方便的旋转过渡，是异常不敏感的磁场。我们在实验上验证了CaF的这一点，我们发现了灵敏度低于5 Hz G^{-1}的跃迁，并用它来证明磁阱中的旋转相干时间为6.4（8）ms。模拟表明，这是可行的，以延长到1秒以上，使用一个较小的云在偏置磁阱。
Polar molecules in superpositions of rotational states exhibit long-range dipolar interactions, but maintaining their coherence in a trapped sample is a challenge. We present calculations that show many laser-coolable molecules have convenient rotational transitions that are exceptionally insensitive to magnetic fields. We verify this experimentally for CaF where we find a transition with sensitivity below 5 Hz G^{-1} and use it to demonstrate a rotational coherence time of 6.4(8) ms in a magnetic trap. Simulations suggest it is feasible to extend this to more than 1 s using a smaller cloud in a biased magnetic trap.