With growing interest in quantum technologies, possibilities of synchronizing quantum systems have garnered significant recent attention. In experiments with dilute ensemble of laser cooled spin-1 ${}^{87}\mathrm{Rb}$ atoms, we observe phase difference of spin coherences to synchronize with phases of external classical fields. An initial limit-cycle state of a spin-1 atom localizes in phase space due to dark-state polaritons generated by classical two-photon tone fields. In particular, when the two couplings fields are out of phase, the limit-cycle state synchronizes only with two artificially engineered, anisotropic decay rates. Furthermore, we observe a blockade of synchronization due to quantum interference and emergence of Arnold-tongue-like features. Such anisotropic decay induced synchronization of spin-1 systems with no classical analog can provide insights in open quantum systems and find applications in synchronized quantum networks.

中文翻译：

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自旋1原子中的量子相位同步观察。

随着对量子技术的日益增长的兴趣，同步量子系统的可能性近来引起了极大的关注。在激光冷却的spin-1的稀薄合奏中进行的实验${}^{87}b$原子，我们观察到自旋相干的相位差，以与外部经典场的相位同步。由于经典的双光子声场产生的暗态极化子，spin-1原子的初始极限循环状态位于相空间中。特别是，当两个耦合场异相时，极限循环状态仅与两个人工设计的各向异性衰减率同步。此外，我们观察到由于量子干扰和类似Arnold-tongue特征的出现而导致的同步封锁。这种没有经典类似物的自旋1系统的各向异性衰减诱导的同步可以提供开放量子系统的见识，并在同步量子网络中找到应用。