A5022161097- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Information and Cryptography
- Quantum optics and atomic interactions
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Diamond and Carbon-based Materials Research
- Quantum Mechanics and Applications
- Photocathodes and Microchannel Plates
- Dark Matter and Cosmic Phenomena
- Atomic and Molecular Physics
- Molecular Sensors and Ion Detection
- Advanced Database Systems and Queries
- Nuclear Physics and Applications
- Mass Spectrometry Techniques and Applications
- Oceanographic and Atmospheric Processes
- Advanced Frequency and Time Standards
- Underwater Vehicles and Communication Systems
- Particle Accelerators and Free-Electron Lasers
- Radiation Therapy and Dosimetry
- Inertial Sensor and Navigation
- Radiation Detection and Scintillator Technologies
- High-pressure geophysics and materials
- Ion-surface interactions and analysis
- Orbital Angular Momentum in Optics
- Laser-induced spectroscopy and plasma
University of California System
2025
University of California, Berkeley
2017-2019
Hendrix College
2015-2016
Conway School of Landscape Design
2016
University of Wisconsin–Madison
2006-2011
We present the first demonstration of a CNOT gate between two individually addressed neutral atoms. Our implementation uses Rydberg blockade interactions atoms held in optical traps separated by >8 microm. Using different protocols we measure fidelities F=0.73 and 0.72 based on truth table probabilities. The was used to generate Bell states with fidelity F=0.48+/-0.06. After correcting for atom loss obtain an posteriori entanglement F=0.58.
We demonstrate Rabi oscillations of small numbers $^{87}\mathrm{Rb}$ atoms between ground and Rydberg states with $n\ensuremath{\le}43$. Coherent population are observed for single atoms, while the presence two or more decoheres oscillations. show that these observations consistent van der Waals interactions atoms.
We demonstrate Rabi flopping at MHz rates between ground hyperfine states of neutral $^{87}$Rb atoms that are trapped in two micron sized optical traps. Using tightly focused laser beams we high fidelity, site specific rotations with crosstalk on neighboring sites separated by $8 \mu\rm m$ the level $10^{-3}$. Ramsey spectroscopy is used to measure a dephasing time $870 s$ which $\approx$ 5000 times longer than for $\pi/2$ pulse.
Spontaneous symmetry breaking is a universal concept throughout science. For instance, the Landau-Ginzburg paradigm of translational underlies classification nearly all quantum phases matter and explains emergence crystals, insulators, superconductors. Usually, consequences invariance are studied in large systems to suppress edge effects which cause undesired breaking. While this approach works for investigating global properties, studies local observables their correlations require access...
Tests of the standard model particle physics rely on measurements with highly polarized electron beams. A new instrument achieves highest known precision for determining beam polarization low-energy (~1 GeV)
The quantum rotor is one of the simplest model systems in mechanics, but only recent years has theoretical work revealed general fundamental scaling laws for its decoherence. For example, a superposition orientations decoheres at rate proportional to sine squared angle between them. Here, we observe rotational decoherence dynamics first time, using 4 μm diameter planar composed two Paul-trapped ions. We prepare motion ion crystal into superpositions angular momentum with well-defined...
We demonstrate the preparation and coherent control of angular momentum state a two-ion crystal. The ions are prepared with an average $7780\hbar$ freely rotating at 100~kHz in circularly symmetric potential, allowing us to address rotational sidebands. By coherently exciting these motional sidebands, we create superpositions states separated by up four quanta. Ramsey experiments show expected dephasing superposition which is dependent on number quanta separating states. These results...
We probe electric-field noise in a surface ion trap for ion-surface distances $d$ between 50 and 300 \textmu{}m the normal planar directions. find distance dependence to scale as ${d}^{\ensuremath{-}2.6}$ our frequency which is consistent with $1/f$ noise. Simulations of specific geometry provide evidence that we are not limited by technical sources. Our scaling data correlation length about 100 at surface, discuss how patch potentials this size would be modified electrode geometry.
We have performed a novel comparison between electron-beam polarimeters based on Møller and Compton scattering. A sequence of polarization measurements were at low beam currents (<5μA) during the Qweak experiment in Hall-C Jefferson Lab. These current bracketed by regular high (180μA) operation polarimeter. All found to be consistent within experimental uncertainties 1% or less, demonstrating that electron does not depend significantly current. This result lends confidence common practice...
We describe the design, fabrication, and operation of a novel surface-electrode Paul trap that produces radio-frequency-null along axis perpendicular to surface. This arrangement enables control vertical trapping potential consequentially ion-electrode distance via dc-electrodes only. demonstrate confinement single 40Ca+ ions at heights between 50 μm 300 above planar copper-coated aluminum electrodes. Laser-cooling coherent operations are performed on both motional modes. architecture...
We have developed an inexpensive PC camera-based system to measure sensor position and track head motion during magnetoencephalography recordings. The employs mirrors triangulate the of markers using a single camera. Sensor measurement tracking can be performed without need manually digitize or fiducial points. is capable measuring relative 3-D within required volume interest with accuracy ~450 μm constructed for approximately $150.
Quantum rotors promise unique advantages for quantum sensing, simulation, and information processing. At present, a variety of systems ranging from nanoparticles to single molecules trapped ions have demonstrated detection control rotational motion in near the regime. For future applications rotors, understanding their dynamics presence ambient environments decoherence will be critical. While other model such as harmonic oscillator seen extensive experimental study dynamics, experiments...
We describe the design, fabrication, and operation of a novel surface-electrode Paul trap that produces radio-frequency-null along axis perpendicular to surface. This arrangement enables control vertical trapping potential consequentially ion-electrode distance via dc-electrodes only. demonstrate confinement single $^{40}$Ca$^+$ ions at heights between $50~\mu$m $300~\mu$m above planar copper-coated aluminium electrodes. investigate micromotion in direction show cooling both motional modes...
The 53rd Annual Meeting of the APS Division Atomic, Molecular and Optical Physics will take place from May 30 – June 3, 2022 in Orlando, Fl, USA. <a href="https://morressier.zoom.us/j/89880865272?pwd=SWxTRGhra1ZOSDBrSkhVZDBzVDR6UT09/">Virtual Help Desk</a>