Phys. Rev. Lett. 101, 085302 (2008) [4 pages]Superfluid 4He Quantum Interference GratingReceived 27 May 2008; revised 8 July 2008; published 22 August 2008 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. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.085302
DOI:
10.1103/PhysRevLett.101.085302
PACS:
67.25.dg, 03.75.−b, 85.25.Dq
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