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Topic Area: Physics

Displaying records 51 to 60 of 727 records.
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51. Cancellation of Doppler Shifts in a Cold-Atom CPT Clock
Topic: Physics
Published: 7/25/2013
Authors: Elizabeth A Donley, Francois-Xavier R. Esnault, Eric Michael Blanshan, John E Kitching
Abstract: A compact cold-atom clock based on coherent population trapping (CPT) is being developed. Long-term goals for the clock include achieving a fractional frequency accuracy of 1x10^u-13^ in a package of less than 10 cm^u3^ in volume. Here we present an ...

52. Parametric seeding of a microresonator optical frequency comb
Topic: Physics
Published: 7/16/2013
Authors: Scott B Papp, Pascal Patrice Del'Haye, Scott A Diddams
Abstract: We have investigated parametric seeding of a microresonator frequency comb (microcomb) by way of a pump laser with two intensity modulation sidebands. We show that the pump-sideband spacing is precisely replicated throughout the microcomb's optical s ...

53. Determining the Uncertainty of Frequency Measurements Referenced to GPS Disciplined Oscillators
Topic: Physics
Published: 7/15/2013
Author: Michael A Lombardi
Abstract: GPS disciplined oscillators (GPSDOs) are commonly used as references for frequency calibrations. Over long intervals, a GPSDO is an inherently accurate source of frequency because it is continuously adjusted to agree with the Coordinated Universal T ...

54. Superposition, Entanglement, and Raising Schroedinger's Cat
Topic: Physics
Published: 7/12/2013
Author: David J Wineland
Abstract: This is a written version of the lecture I presented in connection with the Nobel Prize ceremonies in December 2012. The paper briefly summarizes experiments on quantum state manipulaiton and measurement in the context of trapped atomic ions. The f ...

55. Mechanical Control of a Microrod-Resonator Optical Frequency Comb
Topic: Physics
Published: 7/8/2013
Authors: Scott B Papp, Pascal Patrice Del'Haye, Scott A Diddams
Abstract: Robust control and stabilization of optical frequency combs enables an extraordinary range of scientific and technological applications, including frequency metrology at extreme levels of precision, novel spectroscopy of quantum gases and of molecule ...

56. Demonstration of a dressed-state phase gate for trapped ions
Topic: Physics
Published: 6/28/2013
Authors: Ting Rei Tan, John P Gaebler, Ryan Steven Bowler, Yiheng Lin, John D. Jost, Dietrich G Leibfried, David J Wineland
Abstract: We demonstrate a trapped ion entangling gate scheme proposed by Bermudez et~al [Phys. Rev. A 85, 040302 (2012)]. Simultaneous excitation of a strong carrier and a single sideband transition enables deterministic creation of entangled states. The meth ...

57. Spectral responsivity based calibration of photometer and colorimeter standards
Topic: Physics
Published: 6/19/2013
Author: George P Eppeldauer
Abstract: Several new generation transfer- and working-standard illuminance meters and tristimulus colorimeters have been developed at the National Institute of Standards and Technology (NIST) to measure all kinds of light sources with low uncertainty. The spe ...

58. Laser-Machined Ultra-High-Q Microrod Resonators for Nonlinear Optics
Topic: Physics
Published: 6/7/2013
Authors: Pascal Patrice Del'Haye, Scott B Papp, Scott A Diddams
Abstract: Optical whispering-gallery microresonators are useful tools in microphotonics, and non-linear optics at very low threshold powers. Here, we present details about the fabrication of ultra-high-Q whispering-gallery-mode (WGM) resonators made by CO2-las ...

59. Classical over-the-barrier model for neutralization of highly charged ions above thin dielectric films
Topic: Physics
Published: 6/3/2013
Authors: Joshua M Pomeroy, Russell Lake, C E Sosolik
Abstract: We apply the classical over-the-barrier model (COB) to charge transfer between highly charged ions (HCIs)and targets consisting of thin dielectric films on metals. Distances for the onset of classically allowed above surface electron capture are ...

60. Lattice damage in superconducting microcalorimeter detectors
Topic: Physics
Published: 6/3/2013
Authors: Robert Daniel Horansky, Joel Nathan Ullom, Michael W Rabin
Abstract: There is currently significant interest in using superconducting detectors for measurement of ion kinetic energies. Unprecedented resolution is possible with an order of magnitude improvement over semiconductors. Superconducting detectors are now ...

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