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NIST Authors in Bold

Displaying 30101 - 30125 of 143784

Direct observation of Feshbach enhanced s-wave scattering of fermions

December 17, 2015
Author(s)
Dina Genkina, Lauren M. Aycock, Hsin I Lu, Ian B. Spielman, Benjamin K. Stuhl
We directly measured the s-wave scattering cross-section of ultracold 40K atoms across the 20.2 mT Feshbach resonance by colliding pairs of degenerate Fermi gases (DFGs) and imaging the scattered atoms. Owing to DFG’s low density, few atoms scattered, even

Multi-element logic gates for trapped-ion qubits

December 17, 2015
Author(s)
Ting Rei Tan, John P. Gaebler, Yiheng Lin, Yong Wan, Ryan S. Bowler, Dietrich G. Leibfried, David J. Wineland
Precision control over hybrid physical systems at the quantum level is of general importance in physics. For trapped-ions, a hybrid system formed of different species introduces extra degrees of freedom that can be exploited to expand and refine the

The Synthesis and Characterization of 1111 Type Diluted Ferromagnetic Semiconductor (La 1-x Ca x )(Zn 1-x Mn x )AsO

December 17, 2015
Author(s)
Cui Ding, Shengli Guo, Yao Zhao, Huiyuan Man, Licheng Fu, Yilun Gu, Zhouyang Wang, L. Liu, B. A. Frandsen, S. Cheung, Y. J. Uemura, T. Goko, H. Luetkens, E. Morenzoni, Yang Zhao, F.L. Ning
We report the synthesis and characterization of a bulk form diluted magnetic semiconductor, (La 1-xCa x)(Zn 1-yMn y)AsO, with a two dimensional crystal structure isostructural to that of the 1111 type Fe-based high-temperature superconductor LaFeAsO and

Topography measurements and applications in ballistics and tool mark identifications

December 17, 2015
Author(s)
Theodore V. Vorburger, Jun-Feng Song, Nicholas D. Petraco
The application of surface topography measurement methods to the field of firearm and toolmark analysis is fairly new. The field has been boosted by the development of a number of competing optical methods which has improved the speed and accuracy of

A Hybrid Task Graph Scheduler for High Performance Image Processing Workflows

December 16, 2015
Author(s)
Timothy J. Blattner, Walid Keyrouz, Milton Halem, Shuvra S. Bhattacharyya, Mary C. Brady
The scalability of applications is a key requirement to improving performance in hybrid and cluster computing. Scheduling code to utilize parallelism is difficult, particularly when dealing with dependencies, memory management, data motion, and processor

A significant-loophole-free test of Bell's theorem with entangled photons

December 16, 2015
Author(s)
Marissa Giustina, Marijn Versteegh, Soren Wengerowsky, Johannes Handsteiner, Armin Hochrainer, Kevin Phelan, Fabian Steinlechner, Johannes Koffler, Larsson Jan-Ake, Carlos Abellan, Waldimar Amaya, Valerio Pruneri, Morgan Mitchell, Joern Beyer, Thomas Gerrits, Adriana Lita, Krister Shalm, Sae Woo Nam, Thomas Scheidl, Rupert Ursin, Bernhard Wittmann, Anton Zeilinger
Local realism is the worldview in which physical properties of objects exist independently of measurement and where physical influences cannot travel faster than the speed of light. Bell's theorem states that this worldview is incompatible with the

A strong loophole-free test of local realism

December 16, 2015
Author(s)
Lynden K. Shalm, Evan Meyer-Scott, B. G. Christensen, Peter L. Bierhorst, Michael A. Wayne, Deny Hamel, Martin J. Stevens, Thomas Gerrits, Scott C. Glancy, Michael S. Allman, Kevin J. Coakley, Shellee D. Dyer, Adriana E. Lita, Varun B. Verma, Joshua C. Bienfang, Alan L. Migdall, Yanbao Zhang, William Farr, Francesco Marsili, Matthew D. Shaw, Jeffrey Stern, Carlos Abellan, Waldimar Amaya, Valerio Pruneri, Thomas Jennewein, Morgan Mitchell, P. G. Kwiat, Richard P. Mirin, Emanuel H. Knill, Sae Woo Nam
We present a loophole-free violation of local realism using entangled photon pairs. We ensure that all relevant events in our Bell test are spacelike separated by placing the parties far enough apart and by using fast random number generators and high
Displaying 30101 - 30125 of 143784
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