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Physics

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Displaying 1576 - 1600 of 2493

NIST Time and Frequency Bulletin

February 3, 2014
Author(s)
Petrina C. Potts
The Time and Frequency Bulletin provides information on performance of time scales and a variety of broadcasts (and related information) to users of the NIST services.

Time Measurement

February 3, 2014
Author(s)
Michael A. Lombardi
An overview of time metrology, with emphasis on time interval measurements, and time synchronization. It covers the evolution of clocks and timekeeping, time scales, the fundamentals of time measurement, and the various time transfer technique used to

Quantum teleportation from a telecom-wavelength photon to a solid-state quantum memory

January 28, 2014
Author(s)
Felix Bussieres, Christoph Clausen, Alexey Tiranov, Boris Korzh, Varun Verma, Sae Woo Nam, Francesco Marsili, Alban Ferrier, Harald Hermann, Christine Silberhorn, Wolfgang Sohler, Mikael Afzelius, Nicolas Gisin
In quantum teleportation [1], the state of a single quantum system is disembodied into classical information and purely quantum correlations, to be later reconstructed onto a second system that has never directly interacted with the first one. This

Comment on Detection of Microwave Spin Pumping Using the Inverse Spin Hall Effect

January 27, 2014
Author(s)
Thomas J. Silva, Mathias A. Weiler, Hans T. Nembach, Justin M. Shaw
In a recent Letter, Hahn et al. reported on the detection of an ac voltage in a yttrium iron garnet (YIG)/platinum (Pt) bilayer under the condition of parametrically excited resonance. The authors observe an ac voltage at the frequency of the magnetization

Optical phase-noise dynamics of Titanium:sapphire optical frequency combs

January 24, 2014
Author(s)
Qudsia Quraishi, Scott A. Diddams, Leo W. Hollberg
Stabilized optical frequency combs (OFC) can have remarkable levels of coherence across their broad spectral bandwidth. We study the scaling of the optical noise across hundreds of nanometers of optical spectra. We measure the residual phase noise between

Fast and Reliable Spectral Response Measurements of PV Cells Using Light Emitting Diodes

January 1, 2014
Author(s)
Behrang H. Hamadani, John F. Roller, Brian P. Dougherty, Howard W. Yoon
We present a measurement system for absolute differential spectral responsivity of solar cells based on high-powered LED arrays coupled to an optical light guide capable of large area illumination. Two different measurement techniques were developed and

Using and creating databases for data analysis in laser spectroscopy

January 1, 2014
Author(s)
Alexander Kramida
A brief review of existing atomic spectroscopy databases is given with an emphasis on databases relevant to laser spectroscopy research. Key data elements in these databases are described. A strategy of building a specialized relational database for laser

Dissipative production of a maximally entangled steady state of two quantum bits

December 19, 2013
Author(s)
John P. Gaebler, Yiheng Lin, Florentin Reiter, Ting Rei Tan, Ryan S. Bowler, Anders Sorensen, Dietrich G. Leibfried, David J. Wineland
Entangled states are a key resource in fundamental quantum physics, quantum cryptography, and quantum computation [1]. To date, controlled unitary interactions applied to a quantum system, so-called "quantum gates'', have been the most widely used method

High-Accuracy Measurements of the Vapor Pressure of Ice Referenced to the Triple Point

December 6, 2013
Author(s)
Katarzyna E. Bielska, Daniel K. Havey, Gregory E. Scace, D Lisak, Allan H. Harvey, Joseph T. Hodges
The vapor pressure of hexagonal (Ih) ice was measured over the temperature range 175 K to 253.4 K and referenced to the value at the triple point of water. This experiment combined a highly accurate humidity generation system containing an ice-coated

Phase inversion and collapse of the cross-spectral function

December 5, 2013
Author(s)
Craig W. Nelson, Archita Hati, David A. Howe
Cross-spectral analysis is a mathematical tool for extracting the power spectral density of a correlated signal from two time series in the presence of uncorrelated interfering signals. We demonstrate and explain a set of conditions where the detection of

Three-Corner Hat Analysis of the Stability of UTC and Various UTC(k)s

December 5, 2013
Author(s)
Thomas E. Parker
The stabilities of some local UTC time scales have recently improved dramatically with the increasing use of cesium or rubidium fountains as nearly always present frequency references. Along with time scales using maser ensembles, there are now a number of

Capture and isolation of highly-charged ions in a compact Penning trap: V12

December 4, 2013
Author(s)
Samuel Brewer, Nicholas D. Guise, Joseph Tan
Room-temperature, compact Penning traps have been shown recently to be useful for capture and storage of highly-charged ions extracted from an EBIT ion source at the National Institute of Standards and Technology (NIST). Highly-charged argon and neon ions

Standardization of 237Np

December 4, 2013
Author(s)
Lizbeth Laureano-Perez, Ryan P. Fitzgerald, Ronald Colle
The standardization of 237Np was investigated. The certified massic activity for 237Np was obtained by 4 liquid scintillation (LS) counting with correction for the 233Pa daughter using the CIEMAT/NIST efficiency tracing method using a 3H standard

Optical Atomic Clocks

December 1, 2013
Author(s)
Christopher W. Oates, N Poli, P. Gill, G.M. Tino
In the last ten years extraordinary results in time and frequency metrology have been demonstrated. Frequency stabilization techniques for continuous wave lasers and femto-second optical frequency combs have enabled a rapid development of frequency

A View on Energy Transfer Between Cold Atoms

November 22, 2013
Author(s)
Elizabeth A. Donley
This is an invited perspective article on a paper that will appear in the same issue. The perspective describes imaging energy transfer between cold Rydberg atoms.

Absolute line intensities for oxirane from 1420 to 1560 cm-1

November 15, 2013
Author(s)
F K. Tchana, M. Ngom, Agnes Perrin, Jean-Marie Flaud, Walter J. Lafferty, S. A. Ndiaye, El. A. Ngum
Absolute individual line intensities of numerous transitions of the fundamental ν2 and ν10 bands of oxirane (ethylene oxide, c-C2H4O) have been measured in the 1420-1560 cm-1 region using seven high- resolution Fourier transform spectra recorded at 0.002

Absolute line intensities for the nu3 band of oxirane (C2H4O)

November 15, 2013
Author(s)
Walter J. Lafferty, Jean-Marie Flaud, Fridolin Kwabia, A. Perrin, M. Ngom
Seven Fourier transform spectra of the ν3 band of oxirane (ethylene oxide) have been recorded with different pressures and used to derive individual line intensities. These line intensities were satisfactorily fit leading to accurate transition moment

Polarization Enhanced Absorption Spectroscopy for Laser Stabilization"

November 15, 2013
Author(s)
Paul D. Kunz, Thomas P. Heavner, Steven R. Jefferts
We demonstrate a variation of pump-probe spectroscopy that is particularly useful for laser frequency stabilization. This polarization enhanced absorption spectroscopy (POLEAS) signal provides a significant improvement in signal-to-noise ratio over

Benchmark of collisional-radiative models for ITER beams at Alcator C-Mod tokamak

November 12, 2013
Author(s)
I. O. Bespamyatnov, W. L. Rowan, K. T. Liao, O. Marchuk, Yuri Ralchenko, R. S.
The beam-based plasma diagnostics on ITER require high accuracy and reliability which accordingly puts challenging requirements on the collisional-radiative (CR) models used for the description of excited states of high energy beam atoms. These states are
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