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You searched on: Author: James Porto

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1. 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 Charles 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 ...

2. 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 ...

3. 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 ...

4. 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 ...

5. 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 ...

6. 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 ...

7. Rapid Production of ^87^Rb BECs in a Combined Magnetic and Optical Potential
Published: 8/31/2009
Authors: Yu-Ju Lin, Abigail Reiko Perry, Robert L. Compton, Ian B Spielman, James V Porto
Abstract: We describe an apparatus for quickly and simply producing ^87^Rb Bose-Einstein condensates. It is based on a magnetic quadrupole trap and a red detuned optical dipole trap. We collect atoms in a magneto-optical trap (MOT) and then capture the atom ...

8. Optical Lattice-Based Addressing and Control of Long-Lived Neutral-Atom Qubits
Published: 7/6/2009
Authors: Nathan Lundblad, J Obrecht, Ian B Spielman, James V Porto
Abstract: The establishment of a scalable, addressable, and long-lived scheme for quantum computing would be a scientific watershed, harnessing the laws of quantum physics to solve classically intractable problems. Many proposed computational platforms are dri ...

9. A Bose-Einstein Condensate in a Uniform Light-Induced Vector Potential
Published: 3/30/2009
Authors: Yu-Ju Lin, Robert L. Compton, Abigail Reiko Perry, William D Phillips, James V Porto, Ian B Spielman
Abstract: We use a two-photon dressing field to create an effective vector gauge potential for Bose-condensed ^87Rb atoms in the F=1 hyperfine ground state. The dressed states in this Raman field are spin and momentum superpositions, and we adiabatically load ...

10. Improving Correlations with Inelastic Loss
Published: 6/6/2008
Author: James V Porto
Abstract: Correlations are one of the central features of modern condensed matter physics. They arise in systems where the behavior of any given particle in a system depends strongly on all the other particles. Such correlations are what help distinguish the r ...

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