Superfluid He4 Quantum Interference Grating

Yuki Sato, Aditya Joshi, and Richard Packard
Phys. Rev. Lett. 101, 085302 – Published 22 August 2008

Abstract

We report the first observation of quantum interference from a grating structure consisting of four weak link junctions in superfluid He4. 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.

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  • Received 27 May 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.085302

©2008 American Physical Society

Authors & Affiliations

Yuki Sato, Aditya Joshi, and Richard Packard

  • Physics Department, University of California, Berkeley, California 94720, USA

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Issue

Vol. 101, Iss. 8 — 22 August 2008

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