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Displaying 676 - 700 of 2769

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 …

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 …

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 …

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 …

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 …

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 …

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 …

In-Situ Hardening Hydroxyapatite-Based Scaffold for Bone Repair

July 7, 2005
Author(s)
Yu Zhang, Hockin D. Xu, Shozo Takagi, Laurence C. Chow
… hydroxyapatite implants require machining, calcium phosphate cement (CPC) bone repair material is moldable, … bone tissue engineering, calcium phosphate cement, hydroxyapatite, in-situ hardening, …

Ion-beam radiation damage to DNA by investigation of free radical formation and base damage

March 1, 2020
Author(s)
Melis Kant, Pawel Jaruga, Erdem Coskun, Samuel Ward, Alexander Stark, David Becker, Amitav Adhikary, Michael Sevilla, Miral M. Dizdar
… processes and DNA base products involved in Ne-22 ion- beam (ca. 1.4 GeV) radiation damage to hydrated (12 … x 1 mm) samples were stacked in a sample packet and then ion-beam irradiated at 77 K. Free radicals trapped in ion- beam irradiated DNA at 77 K were elucidated using ESR …

Field-induced dehydration and optimal ionic escape paths for C2N membranes

June 11, 2021
Author(s)
Miroslav Barabash, William Gibby, Dmitry Luchinsky, Binquan Luan, Alexander Smolyanitsky, Peter McClintock
… Most analytic theories describing electrostatically driven ion transport through water-filled nanopores assume that the … the specific field-induced phenomena arising during ion transport. Here we consider an atomistic model of electrostatically driven ion permeation through subnanoporous C2N membranes. We …

Frequency Comparison of Two High-Accuracy Al+ Optical Clocks

February 17, 2010
Author(s)
Chin-Wen Chou, David Hume, J.C. Koelemeij, David J. Wineland, Till P. Rosenband
… of 8.6e-18, based on quantum logic spectroscopy of an Al+ ion. A simultaneously trapped Mg+ ion serves to sympathetically laser-cool the Al+ ion and detect its quantum state. The frequency of the … atomic clock, optical clock, high accuracy, aluminum ion, quantum logic …

Preparation of entangled states through Hilbert space engineering

September 28, 2016
Author(s)
Yiheng Lin, John P. Gaebler, Florentin Reiter, Ting R. Tan, Ryan S. Bowler, Yong Wan, Adam C. Keith, Emanuel Knill, Kevin Coakley, Dietrich Leibfried, David J. Wineland, Scott Glancy
… such as fluctuations in laser intensity and frequency, and ion-motion frequencies. …

Quantum information processing and quantum control with trapped atomic ions

December 14, 2009
Author(s)
David J. Wineland
… The role of trapped atomic ions in the field of quantum information processing is … discuss some of the historical developments that enabled ions to enter the field and then summarize the basic … processing and quantum control with trapped atomic ions …

Tunnel junction sensors for HCI-surface measurements at low kinetic energies

January 25, 2013
Author(s)
Joshua M. Pomeroy, Russell E. Lake
… created by particle surface interactions. Highly charged ion (HCI) produced nanofeatures have been the focus of our … due a direct vacuum connection to the NIST electron beam ion trap (EBIT). Using these sensors, we have been able to … Highly charged ions, electron beam ion trap, tunnel junction sensors, stopping power …

Isotopic Ratio Measurements by Time-of-Flight Secondary Ion Mass Spectrometry

July 1, 2001
Author(s)
Albert J. Fahey, S R. Messenger
… Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) is often considered … synonymous with SIMS in the static limit where the ion fluence on the sample surface is so low that damage is … been ruled out. However, the high spatial resolution Ga+ ion beams typically used in ToF-SIMS make it a potentially …

Ultrashallow Depth Profiling with Time-of-flight Secondary Ion Mass Spectrometry

January 1, 1994
Author(s)
J. Bennett, John A. Dagata
… Time-of-flight secondary ion mass spectrometry (TOF-SIMS) is an efficient, sensitive … of TOF-SIMS ultrashallow depth profiling is demonstrated ion GaAs substrates that were passivated with P2S5 solutions … Ultrashallow Depth Profiling with Time-of-flight Secondary Ion Mass Spectrometry …

An Unconventional Tradespace of Focused-Ion-Beam Machining

June 20, 2022
Author(s)
Andrew Madison, John S. Villarrubia, Kuo-Tang Liao, Joshua Schumacher, Kerry Siebein, Robert Ilic, James Alexander Liddle, Samuel M. Stavis
… focused-ion-beam machining, resolution, throughput, chromia, silica … An Unconventional Tradespace of Focused-Ion-Beam Machining …

Effects of an Oscillating Electric Field on and Dipole Moment Measurement of a Single Molecular Ion

May 31, 2023
Author(s)
Alejandra Collopy, Julian Schmidt, Dietrich Leibfried, David Leibrandt, Chin-wen Chou
… (rf) electric field experienced by a molecular ion in an rf Paul trap, a leading systematic in the … uncertainty of the field-free rotational transition. The ion is deliberately displaced to sample different known rf … comb which probes rotational transitions in the molecular ion. With improved coherence of the comb laser, a fractional …

Coherently displaced oscillator quantum states of a single trapped atom

June 11, 2019
Author(s)
Katherine C. McCormick, Jonas Keller, David J. Wineland, Andrew C. Wilson, Dietrich Leibfried
… harmonic oscillator number states of a harmonically bound ion can be coupled to two internal states of the ion by a laser-induced motional sideband interaction. The … detuning of the displacement drive with respect to the ion's motional frequency. We precisely characterize the …
Displaying 676 - 700 of 2769
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