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Physics

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Displaying 776 - 800 of 2493

Accurate Integral Counting Using Multi-channel Analyzers

May 1, 2020
Author(s)
Ryan P. Fitzgerald, Lynne E. King
Many techniques in radionuclide metrology rely on accurate measurement of the total count rate, that is integral counting, from a detector. In modern experiments, this can be achieved by integrating the total number of counts in an energy spectrum produced

All-fiber frequency comb at 2 mm providing 1.4-cycle pulses

May 1, 2020
Author(s)
Sida Xing, Abijith S. Kowligy, Daniel Lesko, Alexander Lind, Scott Diddams
We report an all-fiber approach to generating sub-2-cycle pulses at 2 µm and a corresponding octave-spanning optical frequency comb. Our configuration leverages mature erbium:fiber laser technology at 1.5 µm to provide a seed pulse for a thulium-doped

Single-Photon Sources: Approaching the Ideal through Multiplexing

April 30, 2020
Author(s)
Alan L. Migdall, Evan Meyer-Scott, Christine Silberhorn
We review the rapid recent progress in single-photon sources based on multiplexing multiple probabilistic photon-creation events. Such multiplexing allows higher single-photon probabilities and lower contamination from higher-order photon states. We study

Laser-free trapped-ion entangling gates with simultaneous insensitivity to qubit and motional decoherence

April 29, 2020
Author(s)
R. T. Sutherland, Raghavendra Srinivas, Shaun C. Burd, Hannah Knaack, Andrew C. Wilson, David J. Wineland, Dietrich Leibfried, David T. Allcock, Daniel Slichter, S. B. Libby
The dominant error sources for state-of-the-art implementations of laser-free trapped-ion entangling gates are decoherence of the qubit state and motion. The gate error from these decoherence mechanisms can be suppressed with additional control fields, or

Frequency stability of the mode spectrum of broad bandwidth Fabry-Perot interferometers

April 27, 2020
Author(s)
Jeffrey M. Jennings, Ryan C. Terrien, Connor Fredrick, Michael Grisham, Mark Notcutt, Samuel Halverson, Suvrath Mahadevan, Scott Diddams
When illuminated by a white light source, the discrete resonances of a Fabry- Perot interferometer (FP) provide a broad bandwidth, comb-like spectrum useful for frequency calibration. We report on the design, construction, and laboratory characterization

Quantum Logic Spectroscopy with Ions in Thermal Motion

April 16, 2020
Author(s)
Daniel Kienzler, Yong Wan, Stephen Erickson, Jenny Wu, Andrew C. Wilson, David J. Wineland, Dietrich Leibfried
A mixed-species geometric phase gate has been proposed for implementing quantum logic spectroscopy on trapped ions, which combines probe and information transfer from the spectroscopy to the logic ion in a single pulse. We experimentally realize this

Quasi-elastic Neutron Scattering Measurement of Hydrogen Diffusion in a Graphene Oxide Framework

April 16, 2020
Author(s)
Matthew J. Connolly, Z. N. Buck, Carlos Wexler, Joseph C. Schaeperkoetter, H. Taub, Andrew Gillespie, Helmut Kaiser
We present quasielastic neutron scattering (QENS) spectra from molecular hydrogen adsorbed in GOF. The measurements probed the motion of adsorbed hydrogen as a function of pressure, in order to understand the relationship between the motion of adsorbed

Dynamic characterization of an alkali-ion-battery as a source for laser-cooled atoms

April 14, 2020
Author(s)
James P. McGilligan, Kaitlin R. Moore, Songbai Kang, R. Mott, A. Mis, C. Roper, Elizabeth Donley, John Kitching
We investigate a solid-state, reversible, alkali-ion-battery (AIB) capable of regulating the density of alkali atoms in a vacuum system used for the production of laser-cooled atoms. The cold-atom sample can be used with in-vacuum chronoamperometry as a

Mid-Infrared Frequency Comb Generation and Spectroscopy with Few-Cycle Pulses and hd2TH Nonlinear Optics

April 1, 2020
Author(s)
Alexander Lind, Abijith S. Kowligy, Henry R. Timmers, Flavio Caldas da Cruz, Nima Nader, Myles C. Silfies, Thomas K. Allison, Scott Papp, Scott Diddams
The mid-infrared atmospheric window of 3–5.5 μm holds valuable information regarding molecular composition and function for fundamental and applied spectroscopy. Using a robust, mode-locked fiberlaser source of 11 fs pulses in the near infrared, we

Frequency-comb spectroscopy on pure quantum states of a single molecular ion

March 27, 2020
Author(s)
Chin-wen Chou, Alejandra L. Collopy, Christoph Kurz, Yiheng Lin, Michael E. Harding, Philipp N. Plessow, Tara M. Fortier, Scott A. Diddams, Dietrich G. Leibfried, David R. Leibrandt
Spectroscopy is a powerful tool for studying molecular properties and is commonly performed on large thermal ensembles of molecules that are perturbed by motional shifts and interactions with the environment and one another, resulting in convoluted spectra

NIST Time and Frequency Bulletin

March 20, 2020
Author(s)
Kelsey A. Rodriguez
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.

A chip-scale optical frequency reference for the telecommunication band based on acetylene

March 16, 2020
Author(s)
Roy Zektzer, Matthew T. Hummon, Liron Stern, Yefim Barash, Noa Mazurski, John Kitching, Levy Uriel
Lasers precisely stabilized to known transitions between energy levels in simple, well-isolated quantum systems such as atoms and molecules are highly desired for myriad of applications ranging from precise measurements to optical communications. The

Twist Angle-Dependent Atomic Reconstruction and Moire Patterns in Transition Metal Dichalcogenide Heterostructures

March 13, 2020
Author(s)
Matthew R. Rosenberger, Hsun-Jen Chuang, Vladimir Oleshko, Madeleine Phillips, Kathleen M. McCreary, Saujan V. Sivaram, C. Stephen Hellberg, Berend T. Jonker
Van der Waals layered materials, such as the transition metal dichalcogenides (TMDs), are an exciting class of materials with weak interlayer bonding which enables one to create so-called van der Waals heterostructures (vdWH). One promising attribute of

Certified Quantum Measurement of Majorana Fermions

March 12, 2020
Author(s)
Emanuel H. Knill, Abu Ashik Md. Irfan, Karl H. Mayer, Gerardo Ortiz
We present a quantum self-testing protocol to certify measurements of fermion parity involving Majorana fermion modes. We show that observing a set of ideal measurement statistics implies anticommutativity of the implemented Majorana fermion parity

Targeted enrichment of 28Si thin films for quantum computing

March 9, 2020
Author(s)
Ke Tang, Hyun S. Kim, Aruna N. Ramanayaka, David S. Simons, Joshua M. Pomeroy
We report on the growth of isotopically enriched 28Si epitaxial films with precisely controlled enrichment levels, ranging from natural abundance ratio of 92.2% all the way to 99.99987 % (0.832 × 10-6 mol/mol 29Si). Isotopically enriched 28Si is regarded
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