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Topic Area: Physics

Displaying records 551 to 560 of 777 records.
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551. Transfer Standard Filter Radiometers: Applications to Fundamental Scales
Topic: Physics
Published: 1/1/2006
Authors: George P Eppeldauer, Steven W Brown, Keith R Lykke

552. Rotating-radio-frequency ion traps
Topic: Physics
Published: 10/20/2005
Authors: T Hasegawa, John J Bollinger
Abstract: We propose a new ion trap, the rotating-rf trap, in which motion of a charged particle is described not by Mathieu-type functions but by trigonometric functions. In the rotating-rf trap, a quadrupole electric field confines charged particles, whereas ...

553. Surface-Electrode Architecture for Ion-Trap Quantum Information Processing
Topic: Physics
Published: 9/1/2005
Authors: J Chiaverini, Brad Rodney Blakestad, Joseph Wright Britton, John D. Jost, C. Langer, Dietrich G Leibfried, R Ozeri, David J Wineland
Abstract: We investigate a surface-mounted electrode geometry for miniature linear radio frequency Paul ion traps. The electrodes reside in a single plane on a substrate, and the pseudopotential minimum of the trap is located above the substrate at a distance ...

554. A Polarizable Model for Ethylene Oxide
Topic: Physics
Published: 6/18/2005
Author: Raymond Dale Mountain
Abstract: A series of interaction models for ethylene oxide are developed for use in molecular simulation of the thermal properties of both the gas and liquid phases. While it is possible to develop nonpolarizable models to accurately generate either the gas ...

555. Wavelength References for Optical Interferometry
Topic: Physics
Published: 6/12/2005
Authors: Richard W Fox, Leo W. Hollberg
Abstract: We are exploring air wavelength references useful for interferometry. Femtosecond comb frequency measurements determine mode wavelengths of a stable optical cavity in vacuum, and subsequently a tunable laser is locked to the modes in air.

556. A Local Oscillator for Chip-Scale Atomic Clocks at NIST
Topic: Physics
Published: 6/1/2005
Authors: Alan Brannon, J Breitbarth, Z Popovic, Vladislav Gerginov, V Shah, Svenja A Knappe, Leo W. Hollberg, John E Kitching
Abstract: We report the first local oscillator (LO) demonstrating viability in terms of performance, size, and power, for chip scale atomic clocks (CSAC) at the National Institute of Standards and Technology in Boulder, CO. This volgate-controlled oscillator ( ...

557. Low noise synthesis of microwave signals from an optical source
Topic: Physics
Published: 5/26/2005
Authors: John J. McFerran, Eugene N Ivanov, A Bartels, G Wilpers, Christopher W Oates, Scott A Diddams, Leo W. Hollberg
Abstract: We demonstrate the low noise synthesis of a harmonic comb of microwave frequencies using a femtosecond laser based synthesiser that is referenced to a cabity-stabilised laser. The residual phase noise is ~ -110dBc/Hz at 1 Hz from the 10 GHz harmonic. ...

558. Implementation of the semiclassical quantum Fourier transform in a scalable system
Topic: Physics
Published: 5/13/2005
Authors: J Chiaverini, Joseph Wright Britton, Dietrich G Leibfried, Emanuel H Knill, Murray D Barrett, Brad Rodney Blakestad, Wayne M Itano, John D. Jost, C. Langer, R Ozeri, Tobias Schaetz, David J Wineland
Abstract: One of the most interesting future applications of quantum computers is Shor's factoring algorithm, which provides an exponential speedup compared to known classical algorithms. The crucial final step in Shor's algorithm is the quantum Fourier transf ...

559. Optical frequency / wavelentgh references
Topic: Physics
Published: 4/25/2005
Authors: Leo W. Hollberg, Christopher W Oates, G Wilpers, C Hoyt, Zeb Barber, Scott A Diddams, W Oskay, James C Bergquist
Abstract: Ideas for using visible light from atomic transitions for precision instrumentation and metrology go back at least to the 1800's. There are several good reasons to use optical frequencies, and with the scientific and technological advances of the ...

560. International Comparisons of Femtosecond Laser Frequency Combs
Topic: Physics
Published: 4/1/2005
Authors: Long-Sheng Ma, Zhiyi Bi, A Bartels, Lennart Robertsson, Massimo Zucco, Robert Windeler, G Wilpers, Christopher W Oates, Leo W. Hollberg, Scott A Diddams
Abstract: Two types of international comparisons of femtosecond laser frequency combs have been performed in France and the USA. Five combs were involved in the comparisons. Three combs, of which two are transportable, employ nonlinear photonic crystal fiber ( ...

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