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You searched on: Author: james porto Sorted by: date

Displaying records 1 to 10 of 59 records.
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1. Quantum and Classical Dynamics of BEC in a Large-Period Optical Lattice
Published: 4/4/2016
Authors: Ian B Spielman, Johnny H. Huckans, Bruno Laburthe-Tolra, James V Porto, William D Phillips
Abstract: We experimentally investigate diffraction of a ^u87 Rb Bose-Einstein Condensate from a 1D optical lattice. We use a range of lattice periods and timescales, including those beyond the Raman-Nath limit. We compare the results to quantum mechanic ...

2. Dynamically Slowed Collapse of a Bose-Einstein Condensate with Negative Scattering Length
Published: 12/3/2012
Authors: Karina K. Jimenez Garcia, Robert L. Compton, Yu-Ju Lin, James V Porto, Ian B Spielman
Abstract: We rapidly change the scattering length a_s of a ^{87}Rb Bose-Einstein condensate by means of a Feshbach resonance, simultaneously releasing the condensate from its harmonic trapping potential. When a_s is changed from positive to negative, the subs ...

3. Absolute transition frequencies and quantum interference in a frequency comb based measurement of the 6,7Li D lines
Published: 7/6/2011
Authors: Craig J Sansonetti, Clayton Simien, John D Gillaspy, Joseph N Tan, Samuel Middleton Brewer, Roger C Brown, Saijun Wu, James V Porto
Abstract: Optical frequencies of the D lines of 6,7Li were measured with a relative accuracy of 5x10-11 using an optical comb synthesizer. Quantum interference in the laser induced fluorescence for the partially-resolved D2 lines was found to produce polariz ...

4. Differential Light Shift Cancellation in a B-Field Insensitive Transition of 87Rb
Published: 2/11/2011
Authors: Radu S. Chicireanu, Karl D. Nelson, Steven M Olmschenk, Nathan Lundblad, A. Derevianko, James V Porto
Abstract: We demonstrate substantial cancellation of the differential light shift of a magnetic-field-insensitive microwave hyperfine (clock) transition in 87Rb atoms trapped in an optical lattice. Up to 95.5% of the differential light shift is cancelled while ...

5. Synthetic Electric and Magnetic Fields for Ultracold Neutral Atoms
Published: 1/1/2011
Authors: William D Phillips, Yu-Ju Lin, Robert L. Compton, Karina K. Jimenez Garcia, Abigail Reiko Perry, James V Porto, Ian B Spielman
Abstract: We use Raman coupling between magnetic sublevels of a 87Rb Bose-Einstein condensate (BEC) to create an effective vector gauge field for the neutral atoms. They behave as if they were charged particles in a magnetic vector potential. With appropriate ...

6. Randomized Benchmarking of Atomic Qubits in an Optical Lattice
Published: 11/4/2010
Authors: Steven M Olmschenk, Radu S. Chicireanu, Karl D. Nelson, James V Porto
Abstract: We perform randomized benchmarking on neutral atomic quantum bits (qubits) confined in an optical lattice. Single qubit gates are implemented using microwaves, resulting in a measured error per randomized computational gate of 1.4(1) x 10−4 tha ...

7. Phases of a 2D Bose Gas in an Optical Lattice
Published: 9/9/2010
Authors: Karina K. Jimenez Garcia, Yu-Ju Lin, James V Porto, Ian B Spielman
Abstract: Ultra-cold atoms in optical lattices realize essential models in condensed matter physics. Like with most experiments with ultra-cold atoms, our Rubidium-87 Bose Einstein condensate is confined in a harmonic trapping potential that persists even ...

8. Adiabatic Preparation of Many-Body States in Optical Lattices
Published: 6/22/2010
Authors: James V Porto, Anders Sorensen, Ehud Altman, Michael Gullans, Mikhail Lukin, Eugene Demler
Abstract: We analyze a technique for the preparation of low entropy many-body states of atoms in optical lattices based on adiabatic passage. In particular, we show that this method allows preparation of strongly correlated states as stable highest energy st ...

9. Synthetic Magnetic Fields for Ultracold Neutral Atoms
Published: 12/3/2009
Authors: Yu-Ju Lin, Robert L. Compton, Karina K. Jimenez Garcia, James V Porto, Ian B Spielman
Abstract: Neutral atomic Bose condensates and degenerate Fermi gases have realized important many-body phenomena in their most simple and essential forms, without many of the complexities usually associated with material systems. A rich source of physics in el ...

10. Effective three-body interactions and decoherence of coherent atom states in optical lattices
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 ...

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