Synchronization of Active Atomic Clocks via Quantum and Classical Channels
Synchronization of Active Atomic Clocks via Quantum and Classical Channels
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DOI：
10.1103/physreva.94.043841
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发表时间：
2016-08
影响因子：
2.9
通讯作者：
Alexander Roth;K. Hammerer
中科院分区：
文献类型：
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作者：
Alexander Roth;K. Hammerer
基于具有超窄光学跃迁的原子系综的超辐射激光器可以发出前所未有的光谱纯度的光，并且可以用作主动原子钟。我们考虑两个频率失谐的有源原子钟，它们以级联设置耦合，即作为主激光器和从激光器，并研究从激光器与主时钟的同步。在两个原子系综耦合到公共腔模式的设置中，Xu 等人预测了这种同步现象。 [M。 Xu、D. A. Tieri、E. C. Fine、J. K. Thompson 和 M. J. Holland，物理学家。莱特牧师。 113, 154101 (2014).] 并由 Weiner 等人实验观察到。 （J. M. Weiner 等人，arXiv：1503.06464）。在这里，我们证明同步仍然发生在级联设置中，但表现出明显不同的相图。我们研究了与通过公共腔耦合的情况相比的同步特性。我们还考虑通过经典通道进行同步，其中主激光器的光被相敏测量，从激光器通过反馈注入锁定，并与通过量子通道耦合可实现的结果进行比较。
Superradiant lasers based on atomic ensembles exhibiting ultranarrow optical transitions can emit light of unprecedented spectral purity and may serve as active atomic clocks. We consider two frequency-detuned active atomic clocks, which are coupled in a cascaded setup, i.e., as master and slave lasers, and study the synchronization of the slave to the master clock. In a setup where both atomic ensembles are coupled to a common cavity mode, such synchronization phenomena have been predicted by Xu et al. [M. Xu, D. A. Tieri, E. C. Fine, J. K. Thompson, and M. J. Holland, Phys. Rev. Lett. 113, 154101 (2014).] and experimentally observed by Weiner et al. (J. M. Weiner et al., arXiv:1503.06464). Here we demonstrate that synchronization still occurs in cascaded setups but exhibits distinctly different phase diagrams. We study the characteristics of synchronization in comparison to the case of coupling through a common cavity. We also consider synchronization through a classical channel where light of the master laser is measured phase sensitively and the slave laser is injection locked by feedback and compare to the results achievable by coupling through quantum channels.