title: Superfluid 4He quantum interference grating.
abstract: 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.
authors.affiliation: Physics Department, University of California, Berkeley, California 94720, USA.
authors.forename: Yuki
authors.initials: Y
authors.lastname: Sato
authors.forename: Aditya
authors.initials: A
authors.lastname: Joshi
authors.forename: Richard
authors.initials: R
authors.lastname: Packard