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Topic Area: Physics
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Displaying records 1 to 10 of 753 records.
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1. Improvements in SIM Time Network and SIM Time Scale Performance
Topic: Physics
Published: 10/10/2014
Authors: Michael A Lombardi, J. Mauricio Lopez-Romero, Nelida Diaz-Munoz, E. de Carlos-Lopez, Marina Gertsvolf, Ricardo de Carvalho
Abstract: We report recent results achieved within the Sistema Interamericano de Metrología (SIM) regarding the multinational cooperation program in the field of time and frequency metrology. We discuss the performance of the SIM Time Network (SIMTN) and the S ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916197

2. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916283

3. 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, N. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916219

4. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916097

5. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915600

6. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914935

7. Enriching 28Si beyond 99.9998 % for semiconductor quantum computing
Topic: Physics
Published: 8/5/2014
Authors: Kevin Joseph Dwyer, Joshua M Pomeroy, David S Simons, June Waiyin Lau, Kristen L Steffens
Abstract: Using a laboratory-scale apparatus, we enrich 28Si to 40 times better than previously reported starting from natural abundance silane gas and offer another source for providing these critical materials from the industrial gas centrifuge methods. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915236

8. Electro-optical frequency division and stable microwave synthesis
Topic: Physics
Published: 7/19/2014
Authors: Scott A Diddams, Jiang Li, Xu Li, Hansuek Lee, Kerry J. Vahala
Abstract: Optical frequency division using a mode-locked- laser, frequency comb has revolutionized time keeping and the generation of stable microwave signals. A different approach for optical frequency division and microwave generation using a comb of frequen ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915710

9. NIST traceable measurements of radiance and luminance levels of night-vision-goggle test-instruments
Topic: Physics
Published: 7/2/2014
Authors: George P Eppeldauer, Vyacheslav B Podobedov
Abstract: In order to perform radiance and luminance level measurements of night-vision-goggle (NVG) test instruments, NIST developed new-generation transfer-standard radiometers (TR). The new TRs can perform low-level radiance and luminance measurements with ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916064

10. Early observations of macroscopic quantum jumps in single atoms
Topic: Physics
Published: 7/1/2014
Authors: Wayne M Itano, James C Bergquist, David J Wineland
Abstract: The observation of intermittent fluorescence of a single atomic ion, a phenomenon better known as 'macroscopic quantum jumps,' was an important early scientific application of the three-dimensional rf quadrupole (Paul) trap. The prediction of the phe ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915799



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