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Displaying records 91 to 100 of 789 records.
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91. Quantum simulation and many-body physics with hundreds of trapped ions
Topic: Physics
Published: 9/14/2013
Authors: John J Bollinger, Joseph Wright Britton, Brian C Sawyer
Abstract: By employing forces that depend on the internal electronic state (or spin) of an atomic ion, the Coulomb potential energy of a trapped ion crystal can be modified in a spin-dependent way to mimic effective quantum spin Hamiltonians. We use simple mod ...

92. An atomic clock with 10^u-18^ instability
Topic: Physics
Published: 9/13/2013
Authors: Andrew D Ludlow, Nathan Morris Bjork Hinkley, Jeffrey A Sherman, Nathaniel Blair Phillips, Marco Schioppo, Nathan D. Lemke, Kyle P Beloy, M Pizzocaro, Christopher W Oates
Abstract: Atomic clocks have been transformational in science and technology, leading to innovations such as global positioning, advanced communications, and tests of fundamental constant variation. Next-generation optical atomic clocks can extend the capabili ...

93. A Study of the Diurnal in the Transatlantic TWSTFT Difference
Topic: Physics
Published: 9/7/2013
Authors: Victor Shufang Zhang, Thomas Edward Parker
Abstract: The daily variation (diurnal) in the two-way satellite time and frequency transfer (TWSTFT) difference is one of the most significant instabilities of the TWSTFT technique. The diurnal comes from the daily delay change of the TWSTFT signal paths. In ...

94. Reply to "Comment on: 'Ultrafast Demagnetization Measurements Using Extreme Ultraviolet Light: Comparison of Electronic and Magnetic Contributions'Š
Topic: Physics
Published: 9/4/2013
Authors: Justin M Shaw, Thomas J Silva, Hans Toya Nembach, Emrah Turgut, Patrik Grychtol, Chan La-O-Vorakiat, Henry Kapteyn, Margaret M. Murnane, Stefan Mathias, Martin Aeschlimann, Claus Schneider, Daniel E. Adams
Abstract: In the following, we show that the conclusions of our article titled "Ultrafast Demagnetization Measurements Using Extreme Ultraviolet Light: Comparison of Electronic and Magnetic Contributions" are correct. The Comment of Vodungbo {I}et al.{/I} arg ...

95. State-of-the-Art RF Signal Generation From Optical Frequency Division
Topic: Physics
Published: 9/2/2013
Authors: Archita Hati, Craig W Nelson, Corey Andrew Barnes, Danielle Grace Lirette, Tara Michele Fortier, Franklyn J Quinlan, Jason A. (Jason) DeSalvo, Andrew D Ludlow, Till P Rosenband, Scott A Diddams, David Allan Howe
Abstract: We present the design of a novel, ultra-low phase-noise frequency synthesizer implemented with extremely low noise regenerative frequency dividers. This synthesizer generates eight outputs viz. 1.6 GHz, 320 MHz, 160 MHz, 80 MHz, 40 MHz, 20 MHz, 10 MH ...

96. Detection of l-C3H+ in Sgr B2(N) and Sgr B2(OH) and Refinement of its Spectroscopic Constants via the Publicly Available PRIMOS Survey and the Barry E. Turner Legacy Survey
Topic: Physics
Published: 9/1/2013
Authors: Francis John Lovas, Brett A. McGuire, P. Brandon Carroll, Ryan A. Loomis, Geoffery A. Blake, Jan M. Hollis, Phillip R. Jewell, Anthony J. Remijan
Abstract: Pety et al. (2012) recently reported the detection and assignment of l-C3H+ in the Horsehead nebula. Here, we expand that analysis to include the J = 1 - 0 and J = 2 - 1 transitions of l-C3H+ observed in absorption towards Sgr B2(N) in data from the ...

97. Report of Special Nuclear Material Validation Measurements for Backpack Type Radiation Detectors
Series: Technical Note (NIST TN)
Report Number: 1808
Topic: Physics
Published: 8/19/2013
Authors: Leticia S Pibida, Christina Ward
Abstract: This report provides results and recommendations from the validation testing for the different source configurations and radiation fields produced by special nuclear materials (SNMs) and depleted uranium (DU) listed within the Technical Capabilit ...

98. Relaxation timescales and decay of correlations in a long-range interacting quantum simulator
Topic: Physics
Published: 8/2/2013
Authors: John J Bollinger, Mauritz van den Worm, Rytis Paskauskas, Brian C Sawyer, Michael Kastner
Abstract: When a physical system is coupled to a heat bath, one expects to observe thermalization to an equilibrium state whose temperature is determined by the bath properties. For an isolated many-body system, i.e. in the absence of a heat bath, the situatio ...

99. 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 ...

100. 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 ...

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