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Search Publications by: James(Trey) Porto (Fed)

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Displaying 51 - 75 of 90

Strongly Inhibited Transport of a Degenerate 1D Bose Gas in a Lattice

April 1, 2005
Author(s)
C Fertig, K M. O'Hara, J H. Huckans, S L. Rolston, William D. Phillips, James V. Porto
We report the observation of strongly damped dipole oscillations of a quantum degenerate 1D atomic Bose gas in a combined harmonic and optical lattice potential. Damping is significant for very shallow axial lattices (0.25 photon recoil energies), and

Study of a 1D Interacting Quantum Bose Gas

October 1, 2004
Author(s)
B Laburthe, K M. O'Hara, J H. Huckans, M Anderlini, James V. Porto, S L. Rolston, William D. Phillips
The loading of a Bose-Einstein condensate into a deep 2D optical lattice provides a unique way to study 1D Bose gases: the strong radial confinement freezes any motion in two dimensions, and for deep enough lattices, the system can be seen as an array

Observation of Reduced Three-Body Recombination in a Fermionized 1D Bose Gas

May 14, 2004
Author(s)
B L. Tolra, K M. O'Hara, J H. Huckans, William D. Phillips, S L. Rolston, James V. Porto
We investigate correlation properties of a one-dimensional interacting Bose gas by loading a mangnetically trapped 87Rb Bose-Einstein condensate into a deep two-dimensional optical lattice. We measure the three-body recombination rate for both the BEC in

Superfluid-to-Mott-Insulating Transition in a One-Dimensional Atomic Gas

February 1, 2004
Author(s)
C Fertig, K M. O'Hara, J H. Huckans, James V. Porto, William D. Phillips
Over the past two decades, the Mott-insulating phase transition has received a great deal of attention as a prototypical example of a quantum phase transition in a strongly-correlated system for which quantum fluctuations drive the phase transition at zero

Adiabatic Loading of Bosons Into Optical Lattices

January 16, 2004
Author(s)
P B. Blakie, James V. Porto
We calculate the entropy-temperature curves for non-interacting bosons in a 3D optical lattice and a 2D lattice with transverse harmonic confinement for ranges of depths and filling factors relevant to current experiments. These curves predict regimes

Quantum Information With Neutral Atoms as Qubits

July 1, 2003
Author(s)
James V. Porto, S L. Rolston, B L. Tolra, Carl J. Williams, William D. Phillips
Neutral atoms trapped in periodic optical potentials (optical lattices) offer a possible route toward quantum computation. The atoms can be kept well isolated from the environment, yet can be easily manipulated with the tools of atomic physics. This paper

Quantum Information With Neutral Atoms as Quibits

July 1, 2003
Author(s)
James V. Porto, S L. Rolston, B L. Tolra, Carl J. Williams, William D. Phillips
One of the essential features of a quantum computer is a quantum register of well-characterized qubits. Neural atoms in optical lattices are a natural candidate for such a register. We have demonstrated a pattern loading technique that can be used to load

Patterned Loading of a Bose-Einstein Condensate Into an Optical Lattice

May 1, 2003
Author(s)
S P. Peil, James V. Porto, B L. Tolra, J Obrecht, B E. King, M Subbotin, S L. Rolston, William D. Phillips
We have developed a technique to control the placement of atoms in an optical lattice by using a superlattice comprising two separately manipulated, periodic optical potentials with commensurate periods. We demonstrate selective loading of Bose-condensed

Bose-Einstein Condensate in Optical Lattices

January 1, 2002
Author(s)
A Browaeys, James V. Porto, S P. Peil, B Laburthe, J Obrecht, C R. McKenzie
We will present some results from the two Bose-Einstein condensation experiments at NIST Gaithersburg (on sodium and rubidium). We investigate the behaviour of the condensate in an optical lattice. The lattices are created by illuminating the cloud with

Analysis of Broadband X-Ray Spectra of Highly Charged Krypton From a Microcalorimeter Detector of an Electron-Beam Ion Trap

April 1, 2001
Author(s)
I Kink, J M. Laming, E Takacs, James V. Porto, John D. Gillaspy, E Silver, H. Schnopper, Simon R. Bandler, M Barbera, N Brickhouse, S Murray, N. Madden, D Landis, J. Beeman, E. E. Haller
Spectra of highly charged Kr ions, produced in an EBIT, have been recorded in a broad x-ray energy band (0.3-4 keV) with a microcalorimeter detector. Most of the spectral lines have been identified as transitions of B- to Al-like Kr. The transition