Celebrated interference experiments have demonstrated the wave nature of light1 and electrons2, quantum interference being the manifestation of wave–particle duality. More recently, double-path interference experiments have also demonstrated the quantum-wave nature of beams of neutrons3, atoms4 and Bose–Einstein condensates5. In condensed matter systems, double-path quantum interference is observed in the d.c. superconducting quantum interference device6 (d.c. SQUID). Here we report a double-path quantum interference experiment involving a liquid: superfluid 3He. Using a geometry analogous to the superconducting d.c. SQUID, we control a quantum phase shift by using the rotation of the Earth, and find the classic interference pattern with periodicity determined by the 3He quantum of circulation.
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Quantum interference of currents in an atomtronic SQUID
Nature Communications Open Access 03 July 2020
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We thank S. Vitale and K. Penanen for discussions; Y. Sato for assistance; A. Loshak for making the aperture arrays; and E. Crump, D. Mathews and C. Ku for assistance in improving noise conditions in our building. This work was supported in part by NASA, the Office of Naval Research, the National Science Foundation, and the Miller Institute for Basic Research (J.C.D.).
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Simmonds, R., Marchenkov, A., Hoskinson, E. et al. Quantum interference of superfluid 3He. Nature 412, 55–58 (2001). https://doi.org/10.1038/35083518
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