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Proceedings Paper

Manipulations of cold atoms on a chip: double well potential and 1D Bose gas
Author(s): Jason Alexander; Violeta Prieto; Christopher Rowlett; William Golding; Patricia Lee
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Paper Abstract

We report on progress for a couple of experiments on manipulating cold atoms on a chip for quantum sensing. The first experiments are directed towards developing a compact atom interferometer on an atom chip using a double-well potential. The interferometer uses 87Rb atoms magnetically confined in an atomic waveguide produced by wires on the surface of a lithographically patterned chip. Finite element modeling of combinations of different current configurations with various external bias fields indicated a means of coherently splitting the atomic cloud through dynamically adjusting the currents and bias fields. In these experiments we investigate real-time transformations between different double-well configurations adiabatically and non-adiabatically, and study their effects on the initially trapped atoms. Coherence properties of the two atomic wavepackets are examined. In another set of experiments we investigate the properties of bosons confined to (quasi) one dimension in our magnetic waveguide. When the atom-atom repulsive interaction becomes much larger than the kinetic energy, bosons confined in one dimension can enter a new state of matter, the Tonks-Girardeau gas, in which they behave like non-interacting fermions. However, the bosons can still occupy the same momentum state and therefore the gas cannot be fully described by either Bose-Einstein or Fermi-Dirac statistics. This transition has been observed in optical lattices but not in magnetic atom chip waveguides. We discuss the conditions for obtaining a Tonks-Girardeau gas with 87Rb atoms in our atom chip waveguide as well as a novel signature for observing the transition in our system.

Paper Details

Date Published: 17 May 2012
PDF: 11 pages
Proc. SPIE 8400, Quantum Information and Computation X, 840004 (17 May 2012); doi: 10.1117/12.919546
Show Author Affiliations
Jason Alexander, U.S. Army Research Lab. (United States)
Violeta Prieto, U.S. Army Research Lab. (United States)
Christopher Rowlett, U.S. Army Research Lab. (United States)
William Golding, U.S. Army Research Lab. (United States)
Patricia Lee, U.S. Army Research Lab. (United States)

Published in SPIE Proceedings Vol. 8400:
Quantum Information and Computation X
Eric Donkor; Andrew R. Pirich; Howard E. Brandt, Editor(s)

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