Quantum interference of currents is the most important and well known quantum phenomenon in a conventional superconducting quantum interference device (SQUID). Here, we report the observation of quantum interference of currents in an atomtronic SQUID. Analogous to a conventional SQUID, currents flowing through two junctions in an atomtronic SQUID interfere due to the phase difference from rotation. This interference results in modulation of critical currents. This modulation was observed for three different radii with clear modulation periods which were measured to be consistent with fundamental rotation rates. This observation shows the possibility of studying various interesting SQUID physics with an atomtronic SQUID and especially, macroscopic quantum phenomena with currents may be realized with an atomtronic SQUID toward the goal of quantum metrology of rotation sensing.

电流的量子干扰是常规超导量子干扰设备（SQUID）中最重要的众所周知的量子现象。在这里，我们报告了对原子电子SQUID中电流的量子干扰的观察。与常规SQUID相似，流过原子电子SQUID中两个结的电流会由于旋转产生的相位差而产生干扰。这种干扰导致对临界电流的调制。在三个不同的半径上观察到这种调制，并具有清晰的调制周期，测量周期与基本旋转速率一致。该观察结果表明，有可能使用原子电子SQUID研究各种有趣的SQUID物理学，特别是，