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Physics

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Displaying 1151 - 1175 of 2493

High-precision measurement of the X-ray Cu K-alpha spectrum

May 12, 2017
Author(s)
Marcus H. Mendenhall, Albert Henins, Lawrence T. Hudson, Csilla I. Szabo-Foster, Donald A. Windover, James P. Cline
The structure of the x-ray emission lines of the Cu Kα complex has been remeasured on a newly commissioned instrument, in a manner directly traceable to the Système Internationale definition of the meter. In this measurement, the region from 8000 to 8100

Preparation and coherent manipulation of pure quantum states of a single molecular ion

May 11, 2017
Author(s)
Chin-Wen Chou, Christoph Kurz, David B. Hume, Philipp N. Plessow, David R. Leibrandt, Dietrich G. Leibfried
Laser cooling and trapping of atoms and atomic ions has led to breakthroughs in understanding of exotic phases of matter [1-3], development of exquisite sensors [4] and state-of-the-art atomic clocks [5]. For molecules, with their more complicated internal

Kinetic theory of dark solitons with tunable friction

May 3, 2017
Author(s)
Ian B. Spielman, Hilary Hurst, Victor Galitski
We study controllable friction in a system consisting of a dark soliton in a one-dimensional Bose- Einstein condensate coupled to a non-interacting Fermi gas. The fermions act as impurity atoms, not part of the original condensate, that scatter off of the

Improvements in Accelerometer Calibration at NIST Using Digital Vibrometry

April 29, 2017
Author(s)
Beverly F. Payne, Richard A. Allen, Colleen E. Hood
Improvements in shaker design and laser vibrometer development has provided more precise calibration of accelerometers. Calibrations are performed at frequencies from 1Hz to 20 kHz with improved uncertainty and improved efficiency. The vibrometer mounting

Detector-Independent Verification of Quantum Light

April 21, 2017
Author(s)
Jan Sperling, W.R. Clements, Andreas Eckstein, Meritt Moore, Jelmer Renema, Steven Kolthammer, Sae Woo Nam, Adriana Lita, Thomas Gerrits, Wolfgang Vogel, G.S. Agarwal, Ian Walmsley
We introduce a method for the verification of nonclassical light which is independent of the complex interaction between the generated light and the material of the detectors, which are in our work superconducting transition-edge sensors. This is achieved

The 2016 edition of the Art in Science of MicroTAS

April 21, 2017
Author(s)
Darwin R. Reyes-Hernandez
Dublin, Ireland beheld The 20th International Conference of Miniaturized Systems for Chemistry and Life Sciences (MicroTAS 2016) from October 23 to 27, 2016. The conference not only included a great technical program, but also outreach activities, an

Coherent Frequency Combs for Spectroscopy in the 3-5 Micron Region

April 18, 2017
Author(s)
Daniel I. Maser, Gabriel G. Ycas, William I. Depetri, Flavio Caldas da Cruz, Scott A. Diddams
A tunable mid-infrared frequency comb was created via diff erence frequency generation. Pulses between 1 and 1.5 μm were mixed to make idlers of 2.6-5.2 μm. Two such combs were heterodyned at 5 μm to show their coherence and potential for spectroscopy.

UV-sensitive superconducting nanowire single photon detectors for integration in an ion trap

April 17, 2017
Author(s)
Daniel H. Slichter, Varun B. Verma, Dietrich G. Leibfried, Richard P. Mirin, Sae Woo Nam, David J. Wineland
We demonstrate superconducting nanowire single photon detectors with 76 +/- 4% system detection efficiency at a wavelength of 315 nm and an operating temperature of 3.2 K, with a background count rate below 1 count per second at saturated detection

Infrared and visible laser spectroscopy for highly-charged Ni-like ions

April 12, 2017
Author(s)
Yuri Ralchenko
Application of visible or infrared (IR) lasers for spectroscopy of highly-charged ions (HCI) has not been particularly extensive so far due to a mismatch in typical energies. We show here that the energy difference between the two lowest levels within the

Hyperfine-mediated electric quadrupole shifts in Al+ and In+ ion clocks

April 6, 2017
Author(s)
Kyle P. Beloy, David R. Leibrandt, Wayne M. Itano
We evaluate the electric quadrupole moments of the 1S0 and 3P0 clock states of 27Al+ and 115In+. To capture all dominant contributions, our analysis extends through third order of perturbation theory and includes hyperfine coupling of the electrons to both

Investigation of Feshbach Resonances in ultra-cold 40K spin mixtures

April 3, 2017
Author(s)
Eite Tiesinga, J Krauser, J Heinze, S Gotze, M Lanbecker, N Flashner, L Cook, T Hanna, K Sengstock, C Becker
Magnetically-tunable Feshbach resonances are an indispensable tool for experiments with atomic quantum gases. We report on twenty thus far unpublishedi Feshbach resonances and eleven further probable Feshbach resonances in spin mixtures of ultracold

Cryogenic pulsed I-V measurements on homo- and heterojunction III-V TFETs

April 1, 2017
Author(s)
Quentin Smets, Jihong Kim, Jason Campbell, David M. Nminibapiel, Dmitry Veksler, Pragya Shrestha, Rahul Pandey, Anne S. Verhulst, Eddy Simoens, David J. Gundlach, Curt A. Richter, Kin P. Cheung, Suman Suman, Anda Mocuta, Nadine Collaert, Aaron Thean, Marc Heyns
Most experimental reports of tunneling field-effect transistors show defect-related performance degradation. Charging of oxide traps causes Fermi level pinning, and Shockley-Read-Hall (SRH)/trap-assisted tunneling (TAT) generation cause unwanted leakage

Chained Bell inequality experiment with high-efficiency measurements

March 28, 2017
Author(s)
Ting Rei Tan, Stephen D. Erickson, Peter L. Bierhorst, Daniel Kienzler, Scott C. Glancy, Emanuel H. Knill, Dietrich G. Leibfried, David J. Wineland, Yong Wan
We report correlation measurements on two 9Be+ ions that violate a chained Bell inequality obeyed by any local-realistic theory. The correlations can be modeled as derived from a mixture of a local-realistic probabilistic distribution and a distribution

Magnetic field imaging with microfabricated optically-pumped magnetometers

March 28, 2017
Author(s)
Orang Alem, Rahul Mhaskar, Ricardo Jimenez-Martinez, Dong Sheng, John LeBlanc, Lutz Trahms, Tilman Sander, Svenja A. Knappe
A multichannel imaging system is presented, consisting of 25 microfabricated optically-pumped magnetometers. The sensor probes have a footprint of less than 1 cm2 and a sensitive volume of (1.5 mm)3. They are connected to a control unit through optical

Trade-offs in Size and Performance for a Point Source Interferometer Gyroscope

March 27, 2017
Author(s)
Gregory W. Hoth, John E. Kitching, Elizabeth A. Donley, Bruno Pelle
Point source interferometry (PSI) is a promising technique that could lead to a compact, high- performance gyroscope based on atom interferometry. We consider the trade-offs in size and performance with PSI. In particular, we discuss the sensitivity and

A compact, thermal noise limited reference cavity for ultra-low noise microwave generation

March 23, 2017
Author(s)
Josue Davila-Rodriguez, Frederick N. Baynes, Andrew D. Ludlow, Tara M. Fortier, Holly F. Leopardi, Scott A. Diddams, Franklyn J. Quinlan
A 25 mm long, rigidly-held, ultra-stable optical frequency reference cavity is demonstrated. The cavity spacer has an easy-to-manufacture cylindrical shape which nonetheless exhibits a holding geometry predicted to be first-order insensitive to the

Superconducting Optoelectronic Circuits for Neuromorphic Computing

March 23, 2017
Author(s)
Jeffrey M. Shainline, Sonia M. Buckley, Richard P. Mirin, Sae Woo Nam
We propose a hybrid semiconductor-superconductor hardware platform for the implementation of neural networks and large-scale neuromorphic computing. The platform combines semiconducting few-photon light-emitting diodes with superconducting-nanowire single

Steady-state spin synchronization through the collective motion of trapped ions

March 22, 2017
Author(s)
Athreya Shankar, John Cooper, Justin G. Bohnet, Murray Holland, John Bollinger
Ultranarrow-linewidth atoms coupled to a lossy optical cavity mode synchronize, i.e. develop correlations, and exhibit steady-state superradiance when continuously repumped. This system displays rich collective physics and promises metrological

MOBY Review at Fiducial Reference Measurements for Satellite Ocean Color, Frascati, Italy, Feb 21 to 23, 2017

March 13, 2017
Author(s)
Kenneth Voss, B. Carol Johnson, Mark A. Yarbrough, Stephanie J. Flora, Michael Feinholz, Darryl Peters, Terrance Houlihan, Sean Mundell, Sandy Yarbrough, Art Gleason
This talk provided an overview of the MOBY project and the work we are doing now to move the MOBY instrumentation forward into the future. This is the first of 4 talks we gave at this workshop on various aspects of the MOBY project. The values of the MOBY

Radiometric Metrology for Ocean Color

March 13, 2017
Author(s)
Bettye C. Johnson
This talk covered the topics of uncertainty terminology (in brief), radiometric comparisons, gave an illustration of a spectral radiance scale realization, and concluded with a word on satellite system vicarious calibration (SVC).

Confidence Estimates in Simulation of Phase Noise or Spectral Density

March 8, 2017
Author(s)
Neil Ashby
In this paper we apply the method of discrete simulation of power law noise, developed in [1,2], to simulation of phase noise for a combination of power law noises. We derive the probability of observing a value of phase noise L(f) or of any of the one
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