A5075338556- Laser-Matter Interactions and Applications
- Mass Spectrometry Techniques and Applications
- Atomic and Molecular Physics
- Quantum Information and Cryptography
- Advanced Chemical Physics Studies
- Spectroscopy and Quantum Chemical Studies
- Advanced Fiber Laser Technologies
- Mechanical and Optical Resonators
- Semiconductor materials and devices
- Quantum Computing Algorithms and Architecture
- Integrated Circuits and Semiconductor Failure Analysis
- Quantum optics and atomic interactions
- Neural Networks and Reservoir Computing
- Crystallography and Radiation Phenomena
- Laser Design and Applications
- Laser-Plasma Interactions and Diagnostics
- Cold Atom Physics and Bose-Einstein Condensates
- VLSI and Analog Circuit Testing
- Advancements in Semiconductor Devices and Circuit Design
- Cloud Computing and Resource Management
- Molecular spectroscopy and chirality
- Advanced MEMS and NEMS Technologies
- Advanced Frequency and Time Standards
- Big Data and Business Intelligence
- Catalysis and Oxidation Reactions
Sandia National Laboratories
2021-2024
Sandia National Laboratories California
2002-2022
K Lab (United States)
2022
Joint Institute for Laboratory Astrophysics
2010-2021
University of Colorado Boulder
2009-2016
National Institute of Standards and Technology
2014
We demonstrate, to our knowledge, the first bright circularly polarized high-harmonic beams in soft X-ray region of electromagnetic spectrum, and use them implement magnetic circular dichroism measurements a tabletop-scale setup. Using counterrotating laser fields at 1.3 0.79 µm, we generate harmonics with photon energies exceeding 160 eV. The harmonic spectra emerge as sequence closely spaced pairs left right peaks, determined by conservation energy spin angular momentum. explain...
Using a simple model of strong-field ionization atoms that generalizes the well-known 3-step from 1D to 3D, we show experimental photoelectron angular distributions resulting laser xenon and argon display prominent structures correspond electrons pass by their parent ion more than once before strongly scattering. The shape these can be associated with specific number times electron is driven past its in field Furthermore, careful analysis cutoff energy allows us experimentally measure...
High harmonic light sources make it possible to access attosecond time-scales, thus opening up the prospect of manipulating electronic wave packets for steering molecular dynamics. However, two decades after birth physics, concept chemistry has not yet been realized. This is because excitation and manipulation orbitals requires precisely controlled waveforms in deep ultraviolet, which have synthesized. Here, we present a novel approach using vacuum ultraviolet pulse-trains coherently excite...
Crosstalk is a leading source of failure in multiqubit quantum information processors. It can arise from wide range disparate physical phenomena, and introduce subtle correlations the errors experienced by device. Several hardware characterization protocols are able to detect presence crosstalk, but few provide sufficient distinguish various crosstalk one another. In this article we describe how gate set tomography, protocol for detailed operations, be used identify characterize We...
Imaging and controlling reactions in molecules materials at the level of electrons is a grand challenge science, relevant to our understanding charge transfer processes chemistry, physics, biology, as well material dynamics. Direct access dynamic electron density are shared or transferred between atoms chemical bond would greatly improve molecular bonding structure. Using reaction microscope techniques, we show that can capture how entire valence shell molecule rearranges, from...
Atoms irradiated with combined femtosecond laser and extreme ultraviolet (XUV) fields ionize through multiphoton processes, even when the energy of XUV photon is below ionization potential. However, in presence two different photons an intense field, it possible to induce full electromagnetic transparency. Taking helium as example, field modifies its electronic structure, while leads distinct pathways that can interfere destructively. This work demonstrates a new approach for coherent...
The Quantum Scientific Computing Open User Testbed (QSCOUT) at Sandia National Laboratories is a trapped-ion qubit system designed to evaluate the potential of near-term quantum hardware in scientific computing applications for U.S. Department Energy and its Advanced Research program. Similar commercially available platforms, it offers that researchers can use perform algorithms, investigate noise properties unique systems, test novel ideas will be useful larger more powerful systems future....
Abstract Experiments with trapped ions and neutral atoms typically employ optical modulators in order to control the phase, frequency, amplitude of light directed individual atoms. These elements are expensive, bulky, consume substantial power, often rely on free-space I/O channels, all which pose scaling challenges. To support many-ion systems like trapped-ion quantum computers or miniaturized deployable devices clocks sensors, these must ultimately be microfabricated, ideally...
In rare-gas atoms, Auger decay in which an inner-valence shell ns hole is filled not energetically allowed. However, the presence of a strong laser field, new laser-enabled channel can open up to increase double-ionization yield. This process efficient at high intensities, where be within few femtoseconds its creation. novel fundamental importance for controlling electron dynamics molecules, and materials.
Ultrafast high harmonic beams provide new opportunities for coherently controlling excitation and ionization processes in atoms, molecules, materials on attosecond time scales by employing multiphoton two-pathway electron-wave-packet quantum interferences. Here we use spectrally tailored frequency tuned vacuum extreme ultraviolet combs, together with two phase-locked infrared laser fields, to show how the total single double photoionization yields of argon can be modulated relative phases...
We present the first circularly-polarized soft X-ray harmonics to photon energies >160eV. Bright phase matched beams are used characterize important materials with intrinsic perpendicular magnetic anisotropy for time using tabletop sources.
In rare-gas atoms, an inner-valence shell $\mathit{ns}$ hole cannot be filled by Auger decay because of energy deficiency. We show theoretically and experimentally that adding a moderately intense infrared laser, is possible with rates increasing dramatically for laser intensities $\ensuremath{\geqslant}{10}^{13}$ W/cm${}^{2}$. For Xe the simulated laser-enabled yields are comparable experimental one, while Ar ones much smaller. attribute discrepancies to screening effects photoelectron....
Understanding electron-electron correlations in matter ranging from atoms to solids represents a grand challenge for both experiment and theory. These occur on attosecond timescales have only recently become experimentally accessible. In the case of highly excited systems, task understanding probing correlated interactions is even greater. this work, we combine state-of-the-art light sources advanced detection techniques with ab initio calculations unravel role correlation ${\mathrm{D}}_{2}$...
Using strong field ionization and time-resolved reaction microscope techniques, we visualize both in space time the dynamical evolution of electrons as a molecular bond ruptures, discover new aspects to electronic dynamics.
As trapped ion systems add more ions to allow for increasingly sophisticated quantum processing and sensing capabilities, the traditional optical-mechanical laboratory infrastructure that make such possible are in some cases limiting factor further growth of systems. One promising solution is integrate as many, if not all, optical components waveguides gratings, single-photon detectors, high extinction ratio switches/modulators either into traps themselves or auxiliary devices can be easily...
${\mathrm{D}}_{2}$ molecules, excited by linearly cross-polarized femtosecond extreme ultraviolet (XUV) and near-infrared (NIR) light pulses, reveal highly structured ${\mathrm{D}}^{+}$ ion fragment momenta angular distributions that originate from two different four-step dissociative ionization pathways after four-photon absorption (one XUV $+$ three NIR). We show that, even for very low dissociation kinetic energy release $\ensuremath{\le}$ 240 meV, specific electronic excitation can be...
Excess micromotion can be a substantial source of errors in trapped-ion based quantum processors and clocks due to the sensitivity internal states ion external fields motion. This problem fixed by compensating background electric order position ions at RF node minimize their driven micromotion. Here we describe techniques for chains scalable surface traps. These traps are capable cancelling stray with fine spatial resolution compensate multiple closely spaced large number relatively small...
Quantum processors and atomic clocks based on trapped ions often utilize an ion’s hyperfine transition as the qubit state or frequency reference, respectively. These states are a good choice because they insensitive in first order to magnetic field fluctuations, leading long coherence times stable splittings. In ions, however, these still subject second AC Zeeman effect due necessary presence of oscillating used confine Paul trap configuration. Here, we measure shift 2S1/2 171Yb+ ion caused...
An ultrashort XUV laser pulse ionizes the D2 molecule creating an electronic and nuclear wave packet, with dominant contributions from 2sσg 2pπu ionic states. A delayed interaction a 780 nm IR field ejects second electron, leading to Coulomb explosion of molecule, whose fragments, recorded in coincidence, map dynamics associated those two excited By varying orientation light polarization, one can control molecular by modifying ratio between Experimental ab initio theoretical data are jointly...