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AIP conference proceedings

A Chemical Potential “Battery” for Superfluid 4He Weak Links

Emile Hoskinson, Yuki Sato, Konstantin Penanen, R. E. Packard

Published Jan 1, 2006• 4 citations
Publisher
DOI
10.1063/1.2354630

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We report the first observation of quantum interference from a grating structure consisting of four weak link junctions in superfluid 4He. We find that an interference grating can be implemented successfully in a superfluid matter wave interferometer to enhance its sensitivity while trading away some of its dynamic range. We also show that this type of device can be used to measure absolute quantum mechanical phase differences. The results demonstrate the robust nature of superfluid phase coherence arising from quantum mechanics on a macroscopic scale.