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Topic Area: Physics

Displaying records 11 to 20 of 774 records.
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11. Weak Localization, Spin Relaxation, and Spin-Diffusion: Crossover Between Weak and Strong Rashba Coupling Limits
Topic: Physics
Published: 9/17/2014
Authors: Yasufumi Araki, Guru Bahadur S Khalsa, Allan H. MacDonald
Abstract: Disorder scattering and spin-orbit coupling are together responsible for the diffusion and relaxation of spin-density in time-reversal invariant systems. We study spin-relaxation and diffusion in a two-dimensional electron gas with Rashba spin-orbit ...

12. Photon-number uncertainty in a superconducting transition-edge sensor beyond resolved-photon-number determination
Topic: Physics
Published: 9/10/2014
Authors: Zachary H Levine, Boris L. Glebov, Alan L Migdall, Thomas Gerrits, Brice R. Calkins, Adriana Eleni Lita, Sae Woo Nam
Abstract: As part of an effort to extend fundamental single-photon measurements into the macroscopic regime, we explore how best to assign photon-number uncertainties to output waveforms of a superconducting Transition Edge Sensor (TES) and how those assignmen ...

13. An Improvement of RINEX-Shift Algorithm for Continuous GPS Carrier-Phase Time Transfer
Topic: Physics
Published: 9/8/2014
Authors: Jian Yao, Judah Levine
Abstract: The wide application of GPS carrier-phase (CP) time transfer is limited by the problem of boundary discontinuity. The RINEX-Shift (RS) algorithm was designed to solve this problem. However, if there are GPS data anomalies, the time transfer result co ...

14. A 40 GHz Air-Dielectric Cavity Oscillator with Low Phase Modulation
Topic: Physics
Published: 9/1/2014
Authors: Archita Hati, Craig W Nelson, Billy F Riddle, David Allan Howe
Abstract: We describe the design of a low-phase modulated (PM) noise, 40 GHz oscillator that uses a conventional air-dielectric cavity resonator as a frequency discriminator to improve the PM noise of a commercial 10 GHz dielectric resonator oscillator (DRO) f ...

15. Reducing oscillator PM noise from AM-PM noise correlaiton
Topic: Physics
Published: 8/14/2014
Authors: Archita Hati, Craig W Nelson, David Allan Howe
Abstract: We present a new scheme for improving the phase modulated (PM) noise of an oscillator from correlation between amplitude modulated (AM) and PM noise. Experimental results of this correlation effect are presented. An improvement of almost 10 dB in th ...

16. Measurement of High-Energy (10 keV to 60 keV) X-Ray Spectral Line Widths with eV Accuracy
Topic: Physics
Published: 8/8/2014
Authors: John F Seely, Jack Leigh Glover, Lawrence T Hudson, Yuri Ralchenko, Nino R. Pereira, U. Feldman, C. Di Stefan
Abstract: A high resolution crystal spectrometer (HRCS) utilizing a crystal in transmission geometry has been developed and experimentally optimized to measure the line widths of emission lines in the 10 keV to 60 keV energy range with eV accuracy. The spectro ...

17. Optically-Pumped Magnetometers for MEG
Topic: Physics
Published: 8/8/2014
Authors: Svenja A Knappe, Tillman H. Sander, Lutz Trahms
Abstract: Optically-pumped magnetometers (OPMs) have seen rapid progress over the last decade in terms of performance and technology development. As highly sensitive room-temperature magnetometers they present several advantages over SQUID sensors, such as the ...

18. Single-Mode Optical Fiber For High-Power, Low-Loss UV Transmission
Topic: Physics
Published: 8/8/2014
Authors: Daniel H Slichter, Yves Colombe, Andrew C Wilson, Dietrich G Leibfried, David J Wineland
Abstract: We report large-mode-area solid-core photonic crystal fibers made from fused silica which resist UV solarization even at relatively high optical powers. Using a process of hydrogen loading and UV irradiation of the fibers, we demonstrate stable singl ...

19. Improved Performance, Remote Realization, and Accessibility of the Inter-American Metrology System (SIM) Time Scale
Topic: Physics
Published: 8/7/2014
Authors: Michael A Lombardi, J. Mauricio Lopez-Romero, Nelida Diaz-Munoz, E. de Carlos-Lopez
Abstract: The time and frequency metrology working group of the Inter-American Metrology System (SIM) has developed and currently maintains a number of measurement systems that are designed to coordinate frequency control and timekeeping throughout the America ...

20. Tunable spin-spin interactions and entanglement of ions in separate controlled potential wells
Topic: Physics
Published: 8/7/2014
Authors: Andrew C Wilson, Yves Colombe, K. R. Brown, Emanuel H Knill, Dietrich G Leibfried, David J Wineland
Abstract: Inspired by the ideas of Richard Feynman,^d1^ David Deutsch,^d2^ Seth Lloyd^d3^ and others, researchers in the field of quantum information processing and simulation seek to harness the quantum-mechanical properties of well-controlled laboratory sy ...

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