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Topic Area: Quantum Physics
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Displaying records 11 to 20 of 37 records.
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11. Experimental demonstration of a receiver beating the standard quantum limit for multiple nonorthogonal coherent-state discrimination
Topic: Quantum Physics
Published: 1/6/2013
Authors: Francisco E. Becerra Chavez, Jingyun Fan, Gerald Baumgartner, Julius Goldhar, Jonathan Kosloski, Alan L Migdall
Abstract: The measurement of the state of a quantum system with inherent quantum uncertainty (noise) approaching the ultimate physical limits is of both technological and fundamental interest. Quantum noise prevents any mutually nonorthogonal quantum states ...

12. Propagation of Vortex Electron Wave Functions in a Magnetic Field
Topic: Quantum Physics
Published: 7/5/2012
Authors: Gregg M. Gallatin, Ben McMorran
Abstract: The physics of coherent beams of photons carrying axial orbital angular momentum (OAM) is well understood and such beams, sometimes known as vortex beams, have found applications in optics and microscopy. Recently electron beams carrying very large ...

13. The non-Abelian Duality Problem
Topic: Quantum Physics
Published: 6/6/2012
Authors: Emanuel H Knill, E. Cobanera, Gerardo Ortiz
Abstract: We exploit a new theory of duality transformations to construct dual representations of models incompatible with traditional duality transformations. Hence we obtain a solution to the long-standing problem of non-Abelian dualities that hinges on two ...

14. Casimir force in micro and nano electro mechanical systems
Topic: Quantum Physics
Published: 7/1/2011
Authors: Ricardo Decca, Vladimir A Aksyuk, Daniel Lopez
Abstract: The book chapter covers current state of the art and prospects for using micro and nano electro mechanical systems for Casimir force measurement.

15. Differential Light Shift Cancellation in a B-Field Insensitive Transition of 87Rb
Topic: Quantum Physics
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 ...

16. 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 ...

17. 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 ...

18. 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 ...

19. 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 ...

20. 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 ...

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