V. Chaplin
A5088040415- Gamma-ray bursts and supernovae
- Particle Detector Development and Performance
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Ultrasound and Hyperthermia Applications
- Nuclear Physics and Applications
- Astro and Planetary Science
- Photoacoustic and Ultrasonic Imaging
- Quantum Computing Algorithms and Architecture
- Ionosphere and magnetosphere dynamics
- Lightning and Electromagnetic Phenomena
- Quantum Information and Cryptography
- Ultrasound Imaging and Elastography
- Radiation Detection and Scintillator Technologies
- SAS software applications and methods
- Astronomy and Astrophysical Research
- Earthquake Detection and Analysis
- Quantum and electron transport phenomena
- Ultrasound and Cavitation Phenomena
- Astronomical Observations and Instrumentation
- Stellar, planetary, and galactic studies
- Solar and Space Plasma Dynamics
- Analog and Mixed-Signal Circuit Design
- Geophysics and Sensor Technology
IonQ (United States)
2019-2024
Vanderbilt University Medical Center
2018-2020
Vanderbilt University
2015-2020
Post University
2018
University of Alabama in Huntsville
2009-2016
National Space Science and Technology Center
2010-2011
University of Alabama
2011
Max Planck Institute for Extraterrestrial Physics
2011
Marshall Space Flight Center
2011
Louisiana State University
2011
Abstract Quantum computing leverages the quantum resources of superposition and entanglement to efficiently solve computational problems considered intractable for classical computers. Examples include calculating molecular nuclear structure, simulating strongly interacting electron systems, modeling aspects material function. While substantial theoretical advances have been made in mapping these algorithms, there remains a large gap between resource requirements solving such capabilities...
The Gamma‐ray Burst Monitor (GBM) on the Fermi Space Telescope detected 12 intense terrestrial gamma ray flashes (TGFs) during its first year of observation. Typical maximum energies for most TGFs are ∼30 MeV, with one TGF having a 38 MeV photon; two softer and longer than others. After correcting instrumental effects, representative bright is found to have fluence ∼0.7 photons cm −2 . Pulses either symmetrical or faster risetimes fall times; they well fit Gaussian lognormal functions....
The observations of the exceptionally bright gamma-ray burst (GRB) 130427A by Large Area Telescope aboard Fermi Gamma-ray Space provide constraints on nature these unique astrophysical sources. GRB had largest fluence, highest-energy photon (95 GeV), longest γ-ray duration (20 hours), and one isotropic energy releases ever observed from a GRB. Temporal spectral analyses challenge widely accepted model that nonthermal high-energy emission in afterglow phase GRBs is synchrotron radiated...
Observations of GRB 100724B with the Fermi Gamma-Ray Burst Monitor find that spectrum is dominated by typical Band functional form, which usually taken to represent a non-thermal emission component, but also includes statistically highly significant thermal spectral contribution. The simultaneous observation and components allows us confidently identify two components. fact these seem vary independently favors idea component photospheric origin while dominant occurs at larger radii. Our...
Since its launch in 2008, the Fermi Gamma-ray Burst Monitor (GBM) has triggered and located on average approximately two gamma-ray bursts (GRB) every three days. Here we present third of a series catalogs GRBs detected by GBM, extending second catalog more years, through middle July 2014. The resulting list includes 1405 triggers identified as GRBs. intention GBM GRB is to provide information community most important observables For each location main characteristics prompt emission,...
The field of quantum computing has grown from concept to demonstration devices over the past 20 years. Universal offers efficiency in approaching problems scientific and commercial interest, such as factoring large numbers, searching databases, simulating intractable models physics, optimizing complex cost functions. Here, we present an 11-qubit fully-connected, programmable computer a trapped ion system composed 13 $^{171}$Yb$^{+}$ ions. We demonstrate average single-qubit gate fidelities...
This is the second of a series catalogs gamma-ray bursts (GRBs) observed with Fermi Gamma-ray Burst Monitor (GBM). It extends first two-year catalog by two more years, resulting in an overall list 953 GBM triggered GRBs. The intention GRB to provide information community on most important observables detected For each location and main characteristics prompt emission, duration, peak flux fluence are derived. latter quantities calculated for 50 - 300 keV energy band, where maximum release...
We report on the observation of bright, long gamma-ray burst, GRB 090926A, by Gamma-ray Burst Monitor (GBM) and Large Area Telescope (LAT) instruments board \Fermi\ Space Telescope. 090926A shares several features with other bright LAT bursts. In particular, it clearly shows a short spike in light curve that is present all detectors see this turn suggests there common region emission across entire energy range. addition, while separate high-energy power-law component has already been...
We present systematic spectral analyses of GRBs detected by the Fermi Gamma-Ray Burst Monitor (GBM) during its first two years operation. This catalog contains types spectra extracted from 487 GRBs, and fitting four different models, this results in a compendium over 3800 spectra. The models were selected based on their empirical importance to shape many analysis performed was devised be as thorough objective possible. describe detail our procedure criteria for analyses, bulk form parameter...
[1] Terrestrial Gamma-ray Flashes (TGFs) are brief pulses of energetic radiation observed in low-earth orbit. They associated with thunderstorms and lightning have been both as gamma-ray electron flashes depending on the position spacecraft respect to source. While TGFs detected short lasting less than 1 ms, most seen by Fermi Burst Monitor (GBM) durations greater ms are, instead, result electrons traveling from sources along geomagnetic field lines. We perform spectral analysis three...
The Crab Nebula is the only hard X-ray source in sky that both bright enough and steady to be easily used as a standard candle. As result, it has been normalization by most X-ray/gamma-ray telescopes. Although small-scale variations nebula are well known, since start of science operations Fermi Gamma-ray Burst Monitor (GBM) 2008 August, ∼7% (70 mCrab) decline observed overall flux 15–50 keV band, measured with Earth occultation technique. This independently confirmed ∼15–50 band three other...
A new data mode and analysis methods are used to detect Terrestrial Gamma‐ray Flashes (TGFs) with the Fermi Burst Monitor (GBM) 10 times more frequently than previously. In 1037 h of observations at over regions for which TGFs expected, 384 were found in addition 39 two Electron Beam events already detected without methodology. Cosmic ray showers be an important background; they show characteristic signatures both GBM Large Area Telescope Calorimeter that enable their removal, leaving a...
The Fermi Gamma-ray Burst Monitor (GBM) is designed to enhance the scientific return from in studying gamma-ray bursts (GRBs). In its first two years of operation GBM triggered on 491 GRBs. We summarize criteria used for triggering and quantify general characteristics GRBs, including their locations, durations, peak flux, fluence. This catalog an official product science team, data files containing complete results are available High-Energy Astrophysics Science Archive Research Center.
Focused ultrasound (FUS) has gained recognition as a technique for non-invasive neuromodulation with high spatial precision and the ability to both excite inhibit neural activity. Here we demonstrate that MRI-guided FUS is capable of exciting precise targets within areas 3a/3b in monkey brain, causing downstream activations off-target somatosensory associated brain regions which are simultaneously detected by functional MRI. The similarity between natural tactile stimulation-and FUS- evoked...
We report on a search for correlations between terrestrial gamma ray flashes (TGFs) detected by the Fermi Gamma‐ray Burst Monitor (GBM) and lightning strokes measured using World Wide Lightning Location Network (WWLLN). associate 15 of total 50 GBM‐detected TGFs with individual discharges. establish relative timing TGF stroke to an accuracy <50 μ s, find that in 13 these lightning‐TGF associations, peak are simultaneous ∼40 s. This suggests large fraction coincident The two...
Abstract We show that the rate of association between terrestrial gamma ray flashes (TGFs) observed by Fermi burst monitor and VLF discharges detected World Wide Lightning Location Network (WWLLN) depends strongly on duration TGF, with shortest TGFs having associated WWLLN events over 50% time, longest showing a less than 10% match rate. This correlation is stronger if one excludes are not simultaneous (within 200 µs) TGF. infer from relativistic electron avalanches responsible for flash...
We have performed detailed temporal and time-integrated spectral analysis of 286 bursts from SGR J1550-5418 detected with the Fermi Gamma-ray Burst Monitor (GBM) in January 2009, resulting largest uniform sample properties bursts. used combination broadband high time-resolution data provided GBM to perform statistical studies for source properties. determine durations, emission times, duty cycles rise times all bursts, find that they are typical explore various models our analysis, conclude...
Quantum computers are rapidly becoming more capable, with dramatic increases in both qubit count \cite{kim2023evidence} and quality \cite{moses2023race}. Among different hardware approaches, trapped-ion quantum processors a leading technology for computing, established high-fidelity operations architectures promising scaling. Here, we demonstrate thoroughly benchmark the IonQ Forte system: configured as single-chain 30-qubit computer all-to-all operations. We assess performance of our...
From 2008 July to 2009 October, the Gamma-ray Burst Monitor (GBM) on board Fermi Space Telescope has detected 320 gamma-ray bursts (GRBs). About 20% of these events are classified as short based their T90 duration below 2 s. We present here for first time time-resolved spectroscopy at timescales ms three brightest GRBs observed with GBM. The time-integrated spectra deviate from Band function, indicating existence an additional spectral component, which can be fit by a power law index ∼−1.5....
Gamma-ray burst (GRB) 130427A is one of the most energetic GRBs ever observed. The initial pulse up to 2.5 s possibly brightest well-isolated observed date. A fine time resolution spectral analysis shows power-law decays peak energy from onset pulse, consistent with models internal synchrotron shock pulses. However, a strongly correlated behavior between luminosity and that inconsistent curvature effects arising in relativistic outflow. It difficult for any existing account all temporal...
Abstract Efficiently entangling pairs of qubits is essential to fully harness the power quantum computing. Here, we devise an exact protocol that simultaneously entangles arbitrary on a trapped-ion computer. The requires classical computational resources polynomial in system size, and very little overhead control compared single-pair case. We demonstrate exponential improvement both over current state art. implement software-defined computer, where reconfigure computer architecture demand....
We report on the detailed analysis of high-energy extended emission from short Gamma-Ray Burst (GRB) 081024B, detected by Fermi Gamma-ray Space Telescope. Historically, this represents first clear detection temporal a GRB. The light curve observed Monitor lasts approximately 0.8 seconds whereas in Large Area Telescope for about 3 seconds. Evidence longer lasting associated with long bursts has been already reported previous experiments. Our observations, together earlier study bright GRB...
The Fermi Gamma-ray Space Telescope has opened a new high-energy window in the study of gamma-ray bursts (GRBs). Here we present thorough analysis GRB 080825C, which triggered Burst Monitor (GBM), and was first firm detection by Large Area (LAT). We discuss LAT event selections, background estimation, significance calculations, localization for GRBs general 080825C particular. show results temporal time-resolved spectral GBM data. also some theoretical interpretation observations as well...