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DOE OSTI · 1648112

Quantum interference of currents in an atomtronic SQUID

Ryu, Changhyun·Samson, E. C.·Boshier, Malcolm Geoffrey
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Abstract

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.

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71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICSatomicnuclear and particle physicsquantum metrologysuperconducting properties and materialsultracold gases

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Ryu, Changhyun, Samson, E. C., Boshier, Malcolm Geoffrey. 2020-07-03. Quantum interference of currents in an atomtronic SQUID. https://doi.org/10.1038/s41467-020-17185-6

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