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Displaying 526 - 550 of 727

Optimizing Passive Quantum Clocks

October 8, 2014
Author(s)
Michael J. Mullan, Emanuel Knill
We describe protocols for passive atomic clocks based onquantum interrogation of the atoms. Unlike previous techniques, our protocols are adaptive and take advantage of prior information about the clock's state. To reduce deviations from an ideal clock

Collapse and revivals for systems of short-range phase coherence

October 7, 2014
Author(s)
Khan W. Mahmud, Lei Jiang, Philip R. Johnson, Eite Tiesinga
We predict the existence of novel collapse and revival oscillations that are a distinctive signature of the short-range off-diagonal coherence associated with particle-hole pairs in Mott insulator states. Starting with an atomic Mott state in a one

Interferometric Measurement of the Current-Phase Relationship of a Superfluid Weak Link

September 22, 2014
Author(s)
Stephen Eckel, Fred Jendrzejewski, Avinash Kumar, Christopher J. Lobb, Gretchen K. Campbell
Weak connections between superconductors or superfluids differ from classical links due to quantum coherence, which allows flow without resistance. Transport properties through such weak links can be described with a single function, the current-phase

Dynamic, Ultra-Slow Optical-Matter Wave Analog of an Event Horizon

August 28, 2014
Author(s)
C. J. Zhu, Lu Deng, Edward W. Hagley, Mo-Lin Ge
We investigate theoretically the effects of a dynamically increasing medium index on optical- wave propagation in a rubidium condensate. A long pulsed pump laser coupling a D2 line transition produces a rapidly growing internally generated field. This

Topological Robustness of Transport Statistics for Photons in a Synthetic Gauge Field

August 20, 2014
Author(s)
Sunil Mittal, Jingyun Fan, Sanli Faez, Alan Migdall, Jacob Taylor, Mohammad Hafezi
Electronic transport through a disordered medium leads generically to localization, where conductance drops exponentially with system size, even at zero temperature. The addition of gauge fields to disordered media leads to fundamental changes in transport

Vibronic Coupling in Asymmetric Bichromophores: Experimental Investigation of Diphenylmethane-d5

August 14, 2014
Author(s)
Nathan Pillsbury, Nathanael M. Kidwell, Benjamin Nebgen, Lyudmila V. Slipchenko, Kevin O. Douglass, John R. Cable, David F. Plusquellic
Vibrationally and rotationally resolved electronic spectra of diphenylmethane-d5 (DPM-d5) are reported in the isolated-molecule environment of a supersonic expansion. While small, the asymmetry induced by deuteration of one of the aromatic rings is

Extended Analysis of the Spectrum of Singly Ionized Chromium (Cr II)

July 23, 2014
Author(s)
Craig J. Sansonetti, Gillian Nave
We have made new observations of the spectrum of singly-ionized chromium (Cr II) in the region 2850 Angstrom to 37900 Angstrom with the National Institute of Standards and Technology 2 m Fourier transform spectrometer. These data extend our previously

Persistence of locality in systems with power-law interactions

July 16, 2014
Author(s)
Zhexuan Gong, Michael S. Foss-Feig, Spyridon Michalakis, Alexey Gorshkov
Motivated by recent experiments with ultra-cold matter, we derive a new bound on the propagation of information in D- dimensional lattice models exhibiting 1/r^alpha interactions with alpha > D. The bound contains two terms: One accounts for the short

Non-local propagation of correlations in long-range interacting quantum systems

July 10, 2014
Author(s)
Phil Richerme, Zhexuan Gong, Aaron Lee, Crystal Senko, Jacob Smith, Michael S. Foss-Feig, Spyridon Michalakis, Alexey Gorshkov, Christopher Monroe
The maximum speed with which information can propagate in a quantum many-body system directly affects how quickly disparate parts of the system can become correlated and how difficult the system will be to describe numerically. For systems with only short

Extreme ultraviolet spectra and analysis of ?n=0 transitions in highly charged barium

July 4, 2014
Author(s)
Joseph Reader, John D. Gillaspy, Dmitry D. Osin, Yuri Ralchenko
Extreme ultraviolet spectra of highly charged barium atoms were produced with an electron beam ion trap (EBIT) and recorded with a flat-field grazing-incidence spectrometer. The spectra were measured in the wavelength range 4 nm to 24 nm with the beam

Development of Fiber Fabrey-Perot Interferometers as stable near-infrared calibration sources for high resolution spectrographs

April 30, 2014
Author(s)
Samuel Halverson, Suvrath Mahadevan, Lawrence W. Ramsey, Fred Hearty, John C. Wilson , Jon Holtzman, Stephen L. Redman, Gillian Nave, David Nidever, Matthew Nelson, Nick Venditti, Dmitry Bizyaev , Scott Fleming
We discuss the ongoing development of single-mode ber Fabry-Perot(FFP)Interferometers as precise astrophotonic calibration sources for high precision radial velocity (RV) spectrographs. The devices are simple, inexpensive, monolithic units that can yield a

Measurement of the Kr XVIII 3d 2D5/2 lifetime in a Unitary Penning Trap

April 24, 2014
Author(s)
Nicholas D. Guise, Joseph Tan, Samuel Brewer, Charlotte F. Fischer, P. Jonsson
The lifetime of the 3d 2D5/2 in the fine-structure doublet of the Kr XVIII ground configuration is measured using a compact Penning trap with 2.2 cm3 of trapping volume. Kr17+ ions produced in an electron beam ion trap (EBIT) are extracted and captured in

Beyond the spin model approximation for Ramsey spectroscopy

March 26, 2014
Author(s)
A Koller, M Beverland, Alexey Gorshkov, Ana Maria Rey
Ramsey spectroscopy has become a powerful technique for probing non-equilibrium dynamics of internal (pseudospin) degrees of freedom of interacting systems. In many theoretical treatments, the key to understanding the dynamics has been to assume the

Strong coupling of single emitters interacting with phononic infrared antennae

January 30, 2014
Author(s)
Ruben Esteban, Javier Aizpurua, Garnett W. Bryant
A single emitter can couple with an electromagnetic mode excited in dielectric cavities or metallic particles. In a similar manner, it can couple with a phononic mode supported by a nearby infrared antenna. We consider an emitter with a sufficiently large

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

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

Infrared Laboratory Oscillator Strengths of Fe I in the H-Band

November 19, 2013
Author(s)
Matthew Ruffoni, J C. Pickering, C. Allende Prieto, Gillian Nave
We report experimental oscillator strengths for 28 infrared Fe I transitions, for which no previous experimental values exist. These transitions were selected to address an urgent need for oscillator strengths of lines in the H-band (between 1.4 μm and 1.7

Hyperfine structure of weakly bound levels in the lowest 1g state of molecular 87Rb2

November 13, 2013
Author(s)
Chin-Chun Tsai, T Bergeman, Eite Tiesinga, Paul S. Julienne, D J. Heinzen
Photoassociation resonances in the 87Rb2 1g state dissociating to 52S+52P1/2 were produced by the excitation of colliding 87Rb atoms in a far-off resonance (FORT) trap. Levels down to 31 cm−1 below the dissociation limit were measured with resonance
Displaying 526 - 550 of 727
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