Abstract
We report a new kind of experiment in which we generate a known superfluid velocity in a straight tube and directly determine the phase difference across the tube’s ends using a superfluid matter wave interferometer. By so doing, we quantitatively verify the relation between the superfluid velocity and the phase gradient of the condensate macroscopic wave function. Within the systematic error of the measurement () we find .
- Received 28 February 2007
DOI:https://doi.org/10.1103/PhysRevLett.98.195302
©2007 American Physical Society