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Topic Area: Physics

Displaying records 521 to 530 of 768 records.
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521. Continuous light shift correction in modualted coherent opoulation trapping clocks
Topic: Physics
Published: 10/13/2006
Authors: V Shah, Vladislav Gerginov, P Schwindt, Svenja A Knappe, Leo W. Hollberg, John E Kitching
Abstract: We demonstrate a simple technique to significantly improve the long term frequency stability of atomic clocks based on coherent population trapping (CPT). In this technique, the CPT feilds are created by a modulated diode laser and a slow servo is us ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841944

522. Elimination of two level fluctuators in superconducting quantum bits by an epitaxial tunnel barrier
Topic: Physics
Published: 9/7/2006
Authors: Seongshik Oh, Katarina Cicak, Jeffrey S. Kline, Mika Sillanpaa, Jed Douglas Whittaker, Raymond Wiley Simmonds, David P Pappas, Kevin Osborn
Abstract: Quantum computing based on Josephson junction technology is considered promising due to its scalable architecture. However, decoherence is a major obstacle. Here, we report evidence for improved Josephson quantum bits qubits using a single-crystal ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32352

523. Characterization and Calibration of an Optical Time Domain Reflectometer Calibrator
Topic: Physics
Published: 8/23/2006
Authors: Donald R Larson, Nicholas G Paulter Jr, Kenneth C Blaney
Abstract: We report the results of an investigation into the signal characteristics and behavior of an instrument used to calibrate Optical Time Domain Reflectometers. This instrument implements the Telecommunications Industry Association standard TIA/EIA-455- ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32309

524. A compact phase delay technique for increasing the amplitude of coherent population trapping resonances in open Lambda systems
Topic: Physics
Published: 8/1/2006
Authors: V Shah, Svenja A Knappe, P Schwindt, Vladislav Gerginov, John E Kitching, Leo W. Hollberg
Abstract: We propose and demonstrate a novel technique for increasing the amplitude of coherent population trapping (CPT) resonance in open Lambda systems. The technique requires no complex modifications to the conventional CPT setup and is compatible with sta ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841929

525. A single-ion optical clock with high accuracy
Topic: Physics
Published: 7/14/2006
Authors: W Oskay, Scott A Diddams, Elizabeth A Donley, Tara Michele Fortier, Thomas Patrick Heavner, Leo W. Hollberg, Wayne M Itano, Steven R Jefferts, M J. Jensen, Kyoungsik Kim, F Levi, Thomas Edward Parker, James C Bergquist
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841942

526. Heating Rates and Enhanced Equilibration Rates with Strongly Correlated Ions in a Penning-Malmberg Trap
Topic: Physics
Published: 6/25/2006
Authors: John J Bollinger, Marie J Jensen, T Hasegawa, D HE Dubin
Abstract: We laser cool up to 10^u6^ ^u9^Be^u+^ ions to ~ 1 mK in a Penning-Malmberg trap and measure the ion temperature as a function of time after turning off the cooling laser. We observe a rapid heating of the ions when the their temperature in a directio ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50410

527. A Local Oscillator for Chip-Scale Atomic Clocks at NIST
Topic: Physics
Published: 6/5/2006
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 ( ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50388

528. Relativity and Timing in X-ray Pulsar Navigation
Topic: Physics
Published: 6/5/2006
Authors: Neil Ashby, David Allan Howe
Abstract: XNAV is a technology demonstration that will use photons from X-ray pulsars for navigation and spacecraft attitude determination. This paper summarizes relativistic effects in the context of XNAV. It also characterizes the primary task in the time do ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50396

529. Government Jobs for Physicists: Believe It or Not Challenging and Satisfying!
Topic: Physics
Published: 5/30/2006
Author: David G Seiler
Abstract: This presentation details the benefits of government positions for physicists based on the experiences of a NIST Division Chief.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32273

530. Optical and microwave frequency synthesis with an integrated fiber frequency comb
Topic: Physics
Published: 5/21/2006
Authors: L Hartl, Martin E. Fermann, W Swann, John J. McFerran, Ian R Coddington, Qudsia Quraishi, Scott A Diddams, Nathan Reynolds Newbury, Carston Langrock, M M Fejer, P. S. Westbrook, Jeffrey W. Nicholson, K Feder
Abstract: We demonstrate optical coherence over a broad spectral range of two independent fiber frequency combs. Additionally, we demonstrate microwave stability of better than 2x10^u-14^ in 1 second for an optically integrated fiber frequency comb.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50363



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