U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications

NIST Authors in Bold

Displaying 501 - 525 of 2538

Experimental demonstration of robust, high-fidelity geometric two ion-qubit phase gate

January 1, 2003
Author(s)
Dietrich G. Leibfried, B. L. DeMarco, V Meyer, D Lucas, Murray D. Barrett, Joseph W. Britton, Wayne M. Itano, Branislav M. Jelenkovic, Christopher Langer, Till P. Rosenband, David J. Wineland
… a universal geometric pi-phase gate between two beryllium ion-qubits, based on coherent displacements induced by an … force can be considered constant over the extent of each ion's wave packet. By combining the gate with single-qubit … experiment demonstrating a universal gate between two ion-qubits. The particular properties of the gate make it …

Quantum Computing with Very Noisy Devices

February 13, 2007
Author(s)
Emanuel H. Knill
… This lecture was presented at the Workshop on Trapped Ion Quantum Computing hosted by NIST, February 21 - 24, 2006. … Workshop on Trapped Ion Quantum Computing hosted by NIST …

Degradation of Poly(Acrylates) Under SF 5 ^+^ Primary Ion Bombardment Studied Using Time of Flight Secondary Ion Mass Spectrometry3. Poly (Hydroxyethyl Methacrylate) With Chemical Derivazation

October 16, 2008
Author(s)
M S. Wagner
… Molecular depth profiling of polymers by secondary ion mass spectrometry (SIMS) has focused on the use of … chemistry on polymer degradation under polyatomic primary ion bombardment. In this study, time-of-flight SIMS … group chemistry on their degradation. The sputter rate and ion-induced damage accumulation rate of PHEMA were similar to …

Patterning of Self-assembled Alkanethiol Monolayers on Silver by Microfocus Ion and Electron Beam Bombardment

April 1, 1994
Author(s)
John G. Gillen, Scott A. Wight, Joe Bennett, Michael J. Tarlov
… have been irradiated in selected areas by focused ion or electron bombardment. Subsequent immersion of the … attachment of this molecule to the silver surface in the ion or electron-exposed regions, producing a micrometer … areas was found to reach maximum levels of 70% at ion doses of 6×1013 ions/cm2 and 50% at electron doses of …

The Proteomics Standards Initiative standardized formats for spectral libraries and fragment ion peak annotations: mzSpecLib and mzPAF

August 5, 2024
Author(s)
Joshua Klein, Henry Lam, Tytus Mak, Wout Bittremieux, Yasset Perez-Riverol, Ralf Gabriels, Jim Shofstahl, Helge Hecht, Pierre-Alain Binz, Shin Kawano, Tim Van Den Bossche, Jeremy Carver, Ben Neely, Luis Mendoza, Tomi Suomi, Tine Claeys, Thomas Payne, Douwe Schulte, Zhi Sun, Nils Hoffmann, Yunping Zhu, Steffen Neumann, Andrew Jones, Nuno Bandeira, Juan Antonio Vizcaino, Eric Deutsch
… a standardized data model and serialization for fragment ion peak annotations, called mzPAF … spectral archives, file formats, data standards, fragment ion annotations … standardized formats for spectral libraries and fragment ion peak annotations: mzSpecLib and mzPAF …

Adsorption From Solutions on Synthetic Hydroxyapatite: Nonaqueous Versus Aqueous Solvents

July 1, 1999
Author(s)
D N. Misra
… of solutes from aqueous solutions generally involves ion-exchange with the apatite surface, and may be affected by … mass, and their ability to self-associate. The hydrogen ion concentration plays a decisive role in each one of the … of solutes from aqueous solutions generally involves ion-exchange with the apatite surface, and may be affected by …

Quantitative Depth Profiling of an Alternating Pt/Co Multilayer and a Pt-Co Alloy Multilayer by SIMS Using a Buckministerfullerene (C 60 )

January 1, 2007
Author(s)
K J. Kim, David S. Simons, J Greg Gillen
… A Buckminsterfullerene ion beam has been applied to the depth profiling of an … Quantitative depth profiling was performed by secondary ion mass spectrometry (SIMS) with C60 ions using Pt-Co alloy … due to the nonlinear relationship between the Co and Pt ion intensities and their compositions. …

Quadruply-ionized barium as a candidate for a high-accuracy optical clock

October 23, 2020
Author(s)
Kyle Beloy, Vladimir A. Dzuba, Samuel Brewer
… calculations to determine relevant properties of this ion. The lifetime of the excited clock state is found to be … accommodating low statistical uncertainty with a single ion for practical averaging times. The differential static … atomic clock, highly-charged ion, ion clock, optical clock, optical frequency standard …

Hyperbranched Poly(ethylene oxide) Electrolytes for Lithium Ion Batteries

May 17, 2011
Author(s)
Christopher L. Soles, Kirt A. Page, Huagen H. Peng
… PEO polymers to act as a polyelectrolyte for Li-ion batteries. Hyperbranching has been shown to lead to a 100 fold increase in the ion conductivity below the melting temperature of the PEO … Hyperbranched Poly(ethylene oxide) Electrolytes for Lithium Ion Batteries …

Influence of Ion Solvation on the Properties of Electrolyte Solutions

April 3, 2018
Author(s)
Marat Andreev, Juan J. DePablo, Alexandros Chremos, Jack F. Douglas
… and surface tension. Based on our model, we find that ion-specific effects on thermodynamics properties and by … of electrolyte solutions, derive primarily from the ion-solvation. … Influence of Ion Solvation on the Properties of Electrolyte Solutions …

Depth Profiling of 4-Acetamindophenol-Doped Poly(lactic acid) Films Using Cluster Secondary Ion Mass Spectrometry

June 1, 2004
Author(s)
Christine M. Mahoney, S V. Roberson, John G. Gillen
… The feasibility of cluster Secondary Ion Mass Spectrometry (SIMS) for depth profiling of drug … biodegradable polymer films under dynamic SF 5 + primary ion bombardment was investigated including several films … polymer films showed very little degradation in secondary ion signal as a function of increasing primary ion dose, and …

Resource-efficient dissipative entanglement of two trapped-ion qubits

August 6, 2021
Author(s)
Daniel Cole, Stephen Erickson, Giorgio Zarantonello, Panyu Hou, Jenny Wu, Karl Horn, Daniel Slichter, Florentin Reiter, Christiane Koch, Dietrich Leibfried
… method for generating an entangled state of two trapped-ion qubits. Our implementation produces its target state … Resource-efficient dissipative entanglement of two trapped-ion qubits …

Randomized Benchmarking of Multiqubit Gates

June 29, 2012
Author(s)
John P. Gaebler, Adam M. Meier, Ting Rei Tan, Ryan S. Bowler, Yiheng Lin, David Hanneke, John D. Jost, Jonathan Home, Emanuel H. Knill, Dietrich G. Leibfried, David J. Wineland
… We implemented the benchmarking procedure with trapped-ion two-qubit phase gates and one-qubit gates and found an …

Isotopic Metrology of Carbon Dioxide. I. Interlaboratory Comparison and Empirical Modeling of Inlet Equilibration Time, Inlet Pressure, and Ion Source Conductance

June 1, 2003
Author(s)
R M. Verkouteren, C E. Allison, S A. Studley, K J. Leckrone
… were designed to explore the effects of sample size, ion source conductance, and inlet changeover equilibration … carbon dioxide, gas isotope ratio mass spectrometer, GIRMS, ion source materials, isotopic measurements … Modeling of Inlet Equilibration Time, Inlet Pressure, and Ion Source Conductance …

Scalable Entanglement of Trapped Ions

January 1, 2000
Author(s)
C Monroe, Q A. Turchette, D Kielpinski, B E. King, V Meyer, Wayne M. Itano, David J. Wineland, C J. Myatt, M A. Rowe, Christopher Langer, C A. Sackett
… state so far in a collection of four trapped atomic ions. Notably, we employ a technique that is readily scalable … Scalable Entanglement of Trapped Ions …

Far-from-equilibrium noise heating and laser cooling dynamics in radio-frequency Paul traps

April 23, 2019
Author(s)
A Maitra, Dietrich Leibfried, D. Ullmo, H. Landa
… to a detailed study of the stochastic dynamics of an ion in the different regimes of motion within an anharmonic … becoming diffusive (i.e. it is equally likely to cool the ion as it is to heat it), and also turning into an effective … heating. Such a mechanism implies that a high-energy ion would be easily lost from the trap despite being laser …

Spectroscopy Using Quantum Logic

July 29, 2005
Author(s)
Piet Schmidt, Till P. Rosenband, C. Langer, Wayne M. Itano, James C. Bergquist, David J. Wineland
… with trapped atomic ions, an auxillary "logic" ion provides sympathetic laser cooling, state initialization, … and detection for simultaneously trapped "spectroscopy" ion. Detection is achieved by applying a mapping operation on each ion, which results in a coherent transfer of the spectroscopy …

Unexpected Peaks in Tandem Mass Spectra due to Reaction of Product Ions with Water in Mass Spectrometer Collision Cells

December 15, 2014
Author(s)
Pedatsur Neta, Mahnaz Farahani, Yamil Simon, Yuxue Liang, Xiaoyu Yang, Stephen E. Stein
… While determining the fragmentation pathways of positive ions of drugs, pesticides, metabolites, and other compounds, … mass spectrometry, we noticed that certain product ions react with water in the collision cell. This reaction is … of species that cannot be formed from the precursor ions by known fragmentation pathways. As a result, tandem …
Displaying 501 - 525 of 2538
Was this page helpful?