Manipulations of cold atoms on a chip: double well potential and 1D Bose gas

Jason Alexander; Violeta Prieto; Christopher Rowlett; William Golding; Patricia Lee

doi:10.1117/12.919546

16 May 2012 Manipulations of cold atoms on a chip: double well potential and 1D Bose gas

Jason Alexander, Violeta Prieto, Christopher Rowlett, William Golding, Patricia Lee

Proceedings Volume 8400, Quantum Information and Computation X; 840004 (2012) https://doi.org/10.1117/12.919546
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States

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.

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Jason Alexander, Violeta Prieto, Christopher Rowlett, William Golding, and Patricia Lee "Manipulations of cold atoms on a chip: double well potential and 1D Bose gas", Proc. SPIE 8400, Quantum Information and Computation X, 840004 (16 May 2012); https://doi.org/10.1117/12.919546

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KEYWORDS

Chemical species

Waveguides

Magnetism

Bosons

Clouds

Interferometers

Absorption

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