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Topic Area: Atomic Physics

Displaying records 21 to 30 of 76 records.
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21. Weight Functions for Biases in Atomic Frequency Standards
Topic: Atomic Physics
Published: 3/1/2010
Author: Jon Hardy Shirley
Abstract: Many perturbations that affect atomic frequency standards vary during the period of measurement. To include this time variation, we introduce three time-dependent weight functions built from the solution of the unperturbed equations of motion of a t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902850

22. Quantum information processing and quantum control with trapped atomic ions
Topic: Atomic Physics
Published: 12/14/2009
Author: David J Wineland
Abstract: The role of trapped atomic ions in the field of quantum information processing is briefly reviewed. We discuss some of the historical developments that enabled ions to enter the field and then summarize the basic mechanisms required for logic gates a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903175

23. Radiofrequency dressing of multiple Feshbach resonances
Topic: Atomic Physics
Published: 11/3/2009
Authors: A M Kaufman, R P Anderson, Thomas Mark Hanna, Eite Tiesinga, Paul S Julienne, D S Hall
Abstract: We demonstrate and explain the coupling of several proximate Feshbach resonances in $^{87}$Rb using radiofrequency (rf) radiation. We present accurate measurements of the resonances and observe the changes in the scattering properties that arise thro ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903098

24. Uncooled, Millimeter-Scale Atomic Magnetometers with Femtotesla Sensitivity
Topic: Atomic Physics
Published: 10/26/2009
Authors: John E Kitching, Svenja A Knappe, William C. Griffith, Jan Preusser, V Gerginov, Peter D. Schwindt, Vishal Shah, Ricardo Jimenez Martinez
Abstract: We summarize recent results at NIST to develop high-performance yet highly miniaturized magnetic sensors based on atomic vapors confined in microfabricated alkali vapor cells. These sensors currently achieve sensitivities in the range of a few tens o ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903176

25. Effective three-body interactions and decoherence of coherent atom states in optical lattices
Topic: Atomic Physics
Published: 9/15/2009
Authors: Philip Johnson, Eite Tiesinga, James V Porto, Carl J Williams
Abstract: We show that virtual excitations of neutral bosons to higher vibrational states in a three dimensional optical lattice generate effective, tunable, attractive three-body interactions. These effective processes can quickly decohere coherent states hel ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901125

26. Collisional cooling of ultra-cold atom ensembles using Feshbach resonances
Topic: Atomic Physics
Published: 9/8/2009
Authors: Ludwig G. Mathey, Eite Tiesinga, Paul S Julienne, Charles W Clark
Abstract: We propose a new type of cooling mechanism for ultra-cold fermionic atom ensembles, which capitalizes on the energy dependence of inelastic collisions in the presence of a Feshbach resonance. We first discuss the case of a single magnetic reson ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902264

27. Lattice Interferometer for Ultra-Cold Atoms
Topic: Atomic Physics
Published: 8/11/2009
Authors: Mikkel Andersen, Tycho Sleator
Abstract: We demonstrate an atomic interferometer based on ultra-cold atoms released from an optical lattice. This technique yields a large improvement in signal to noise over a related interferometer previously demonstrated. The interferometer involves diff ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842609

28. Multi-channel modeling of the formation of vibrationally cold polar KRb molecules.
Topic: Atomic Physics
Published: 5/14/2009
Authors: Svetlana Kotochigova, Eite Tiesinga, Paul S Julienne
Abstract: We describe the theoretical advances that influenced the experimental creation of vibrationally and translationally cold polar 40K87Rb molecules [Nature Phys. 4, 622 (2008), Science 322, 231 (2008)]. Cold molecules were created from very-weakly boun ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901233

29. Rotation induced superfluid-normal phase separation in trapped Fermi gases
Topic: Atomic Physics
Published: 5/13/2009
Authors: Menderes Iskin, Eite Tiesinga
Abstract: We use the Bogoliubov-de Gennes formalism to analyze the effects of adiabatic rotation on the ground state phases of harmonically trapped Fermi gases. We find that the rotation breaks Cooper pairs that are located near the trap edge, and that this le ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900933

30. Prediction of Feshbach resonances from three input parameters
Topic: Atomic Physics
Published: 4/30/2009
Authors: Thomas Mark Hanna, Eite Tiesinga, Paul S Julienne
Abstract: We have developed a model of Feshbach resonances in gases of ultracold alkali metal atoms using the ideas of quantum defect theory. Our model requires just three parameters - the singlet and triplet scattering lengths, and the coefficient of the long ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901501