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Topic Area: Quantum Physics
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Displaying records 11 to 20 of 32 records.
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11. Electron Vortex Beams with High Quanta of Orbital Angular Momentum
Topic: Quantum Physics
Published: 1/14/2011
Authors: Benjamin James McMorran, Amit Kumar Agrawal, Ian M. Anderson, Andrew A Herzing, Henri J Lezec, Jabez J McClelland, John Unguris
Abstract: Analogous to vortices in light optical beams, electron optical beams with helical wavefronts carry orbital angular momentum and promise new capabilities for electron microscopy and other applications. We use nanofabricated diffraction holograms in an ...

12. Preserving quantum coherence using optimized open-loop control techniques
Topic: Quantum Physics
Published: 5/16/2010
Authors: Michael J. Biercuk, Hermann Uys, Aaron Vandevender, Nobuyasu Shiga, Wayne M Itano, John J Bollinger
Abstract: We describe experimental and theoretical studies of open-loop quantum control techniques known as dynamical decoupling (DD) for the suppression of decoherence-induced errors in quantum systems. Our experiments on trapped atomic ion qubits demonstra ...

13. The statistical strength of experiments to reject local realism with photon pairs and inefficient detectors
Topic: Quantum Physics
Published: 3/18/2010
Authors: Yanbao Zhang, Emanuel H Knill, Scott C Glancy
Abstract: Because of the fundamental importance of Bell's theorem, a loophole-free demonstration of a violation of local realism is highly desirable. Here, we study violations of local realism involving photon pairs. We quantify the experimental evidence again ...

14. Detection of Voigt Spectral Line Profiles of Hydrogen Radio Recombination Lines toward Sagittarius B2(N)
Topic: Quantum Physics
Published: 2/24/2010
Authors: Francis John Lovas, Azrael A. von Prochazka, Anthony J. Remijan, Dana S. Balser, Robert S. I. Ryans, Adele H. Marshall, Frederic R. Schwab, Jan M. Hollis, Phil R. Jewell
Abstract: We report the detection of Voigt spectral line profiles of radio recombination lines (RRLs) toward Sagittarius B2(N) with the 100-m Green Bank Telescope (GBT). These results constitute the first known, unambiguous detection of the Voigt spectral line ...

15. Synthetic Magnetic Fields for Ultracold Neutral Atoms
Topic: Quantum Physics
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 ...

16. Mode Expansion and Bragg Filtering Enable a High-Fidelity Fiber-Based Photon-Pair Source
Topic: Quantum Physics
Published: 11/9/2009
Authors: Alexander E. Ling, Jun Chen, Jingyun Fan, Alan L Migdall
Abstract: We report the development of a fiber-based single spatial mode source of photon-pairs where the efficiency of extracting photon-pairs is 15x better than a previous implementation [16]. This critical improvement in efficiency enabled a spectrally bri ...

17. Effect of Surface Modes on Photon Propagation through Dielectric Bandgaps
Topic: Quantum Physics
Published: 10/28/2009
Authors: Natalia Malkova, Sergey V Polyakov, Alan L Migdall, Garnett W Bryant
Abstract: We investigate the Hartman saturation effect of photons traveling through barriers created by bandgaps of multilayer stacks. In particular, we investigate theoretically the recently observed jumps in photon transversal times due to adding a single l ...

18. Optical Lattice-Based Addressing and Control of Long-Lived Neutral-Atom Qubits
Topic: Quantum Physics
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 ...

19. Optimal Surface-Electrode Trap Lattices for Quantum Simulation with Trapped Ions
Topic: Quantum Physics
Published: 6/12/2009
Authors: Roman Schmied , Janus H. Wesenberg, Dietrich G Leibfried
Abstract: Trapped ions offer long internal state (spin) coherence times and strong inter-particle interactions mediated by the Coulomb force. This makes them interesting candidates for quantum simulation of coupled lattices. To this end it is desirable to be ...

20. Quantum radiometry
Topic: Quantum Physics
Published: 5/2/2009
Authors: Sergey V Polyakov, Alan L Migdall
Abstract: We review radiometric techniques that take advantage of photon counting and stem from the quantum laws of nature. We present a brief history of metrological experiments and review the current state of experimental quantum radiometry.

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