title: Quantum interference of superfluid 3He.
abstract: Celebrated interference experiments have demonstrated the wave nature of light and electrons, 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 neutrons, atoms and Bose-Einstein condensates. In condensed matter systems, double-path quantum interference is observed in the d.c. superconducting quantum interference device (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.
authors.affiliation: Physics Department, University of California, Berkeley 94720, USA.
authors.forename: R W
authors.initials: RW
authors.lastname: Simmonds
authors.forename: A
authors.initials: A
authors.lastname: Marchenkov
authors.forename: E
authors.initials: E
authors.lastname: Hoskinson
authors.forename: J C
authors.initials: JC
authors.lastname: Davis
authors.forename: R E
authors.initials: RE
authors.lastname: Packard