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Displaying 176 - 200 of 302

High-Speed Quantum Communication Testbed

December 1, 2002
Author(s)
Carl J. Williams, Xiao Tang, M Hiekkero, J Rouzard, R Lu, A Goedecke, Alan L. Migdall, Alan Mink, Anastase Nakassis, Leticia S. Pibida
We describe the current status of the NIST Quantum Communication Testbed (QCT) facility. QCT is a facility for exploring quantum communication in an enviornment similar to that projected for early commercial implementations: quantum cryptographic key

Intensity Effects in Ultracold Photoassociation Line Shapes

December 1, 2002
Author(s)
A Simoni, Paul S. Julienne, Eite Tiesinga, Carl J. Williams
We derive ultracold atom-atom photoassociation line shapes valid for intense light fields and investigate laser power effects in sodium and rubidium photoassociation to the purely long range 0g- symmetry state. We consider intensities up to few hundreds W

Flat-Phase Loading of a Bose-Einstein Condensate into an Optical Lattice

November 1, 2002
Author(s)
S E. Sklarz, I Friedler, D J. Tannor, Y B. Band, Carl J. Williams
It has been proposed that the adiabatic loading of a Bose-Einstein Condensate into an optical lattice via the Mott-Insulator transition can be used to initialize a quantum computer [D.Jaksch, et al., Phys. Rev. Lett. 81, 3108 (1998)]. The loading of a Bose

Photodissociation Spectroscopy of Stored CH + Ions: Detection, Assignment and Close-Coupled Modeling of Near-Threshold Feshbach Resonances

November 1, 2002
Author(s)
U Hechtfischer, Carl J. Williams, J Lange, J Linkemann, D Schwalm, R Wester, A Wolf, D Zajfman
We have measured and theoretically analyzed a photodissociation spectrum of the CH + molecular ion in which most observed energy levels lie within the fine-structure splitting of the C + fragment and predissociate, with the observed irregular lineshapes

Measurement of the Zero Crossing in a Feshbach Resonance of Fermionic 6 Li

October 1, 2002
Author(s)
K M. O'Hara, S L. Hemmer, M E. Granade, M E. Gehm, J E. Thomas, V Venturi, Eite Tiesinga, Carl J. Williams
We measure a zero crossing in the scattering length of a mixture of the two lowest hyperfine states of 6Li. To locate the zero crossing, we monitor the decrease in temperature and atom number arising from evaporation in a CO2 laser trap as a function of

Predissociations in the 0 u + and 1 g States of K 2

October 1, 2002
Author(s)
T Bergeman, Paul S. Julienne, Carl J. Williams, Eite Tiesinga, M R. Manaa, H Wang, P L. Gould, W C. Stwalley
Recently Wang, Gould and Stwalley showed by exciting atomic fragments that predissociation occurs in the Ig and O + u states of K2. In this study, we supplement the interpretation given in the original report with a more detaileddiscussion. The

Creation of a Molecular Condensate by Dynamically Melting a Mott Insulator

July 1, 2002
Author(s)
D Jaksch, V Venturi, J I. Cirac, Carl J. Williams, W.H. Zoller
We propose creation of a molecular Bose-Einstein condensate (BEC) by loading an atomic BEC into an optical lattice and driving it into a Mott insulator (MI) phase with exactly two atoms per site. Molecules in a MI state are then created under well defined
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