A5090938002- Cold Atom Physics and Bose-Einstein Condensates
- Quantum optics and atomic interactions
- Advanced Frequency and Time Standards
- Atomic and Subatomic Physics Research
- Orbital Angular Momentum in Optics
- Advanced Fiber Laser Technologies
- Random lasers and scattering media
- Cybercrime and Law Enforcement Studies
- Spectroscopy and Laser Applications
- Nonlinear Dynamics and Pattern Formation
- Quantum Information and Cryptography
- Network Time Synchronization Technologies
- Magnetic Field Sensors Techniques
- Semiconductor Lasers and Optical Devices
- Neural Networks and Reservoir Computing
- Criminal Law and Evidence
- Digital Holography and Microscopy
- Radioactive Decay and Measurement Techniques
- Quantum and electron transport phenomena
- Molecular Junctions and Nanostructures
- Advanced Optical Imaging Technologies
- Advanced Chemical Physics Studies
- Ethics and Social Impacts of AI
- Quantum, superfluid, helium dynamics
- Quantum Mechanics and Applications
United States Naval Observatory
2020-2024
National Academies of Sciences, Engineering, and Medicine
2019
University of Oklahoma
2011-2017
Virginia Tech
2005
The principle of optical scanning holography (OSH) is proposed to acquire horizontal-parallax-only (HPO) holographic information electronically. We first briefly summarize the results OSH and then discuss how HPO-electronic can be acquired using OSH. Finally we provide simulations illustrate clarify idea. Although many ideas HPO-holography have been studied, best our knowledge, this electronic technique HPO-holographic information.
We demonstrate Feshbach optimized photoassociation (FOPA) into the ${0}_{g}^{\ensuremath{-}}(5{S}_{1/2}+5{P}_{1/2})$ state in $^{85}\mathrm{Rb}_{2}$. FOPA uses enhancement of amplitude initial atomic scattering wave function due to a resonance increase molecular formation rate from photoassociation. observe three vibrational levels, $v=127$, 140, and 150, with previously unmeasured binding energies 256, 154, $96\phantom{\rule{0.28em}{0ex}}{\text{cm}}^{\ensuremath{-}1}$. measure frequency,...
We report on the first deployment of a ytterbium (Yb) transportable optical lattice clock (TOLC), commercially shipping 3000 km from Boulder, Colorado, to Washington DC. The system, composed rigidly mounted reference cavity, an atomic physics package, and frequency comb, fully realizes independent standard for comparisons in microwave domains. shipped Yb TOLC was operational within 2 days arrival, enabling comparison with rubidium (Rb) fountain at United States Naval Observatory (USNO). To...
We demonstrate electromagnetically induced transparency (EIT) in ultracold Rb87 with the control laser a Laguerre–Gaussian mode and probe Gaussian mode. The effects on EIT transmission spectra due to varying sizes are explored optimized. narrowest features that still exhibit large signal contrast occur when have equivalent waists, despite differences radial intensity profiles of beams.
We present the design of a zero-crossing Zeeman slower for 85Rb using rings flexible permanent magnets. The is inexpensive, requires no power or cooling, and can be easily attached removed vacuum maintenance. show theoretically that such reproduce magnetic field profile standard slower. Experimental measurements prototype comparisons to theoretical simulations demonstrate feasibility point toward future improvements. Simulations an atom flux similar other slowers.
We assess the limits to long-term frequency stability of a thermal calcium-beam optical clock from variety experimental parameters by measuring change in with changes that parameter's value. Required regulation keep contributed instability at 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-17</sup> level are extracted these measurements and implications discussed.
Quantum networking protocols relying on interference and precise time-of-flight measurements require high-precision clock synchronization. This study describes the design, implementation, characterization of two optical time transfer methods in a metropolitan-scale quantum research testbed. With active electronic stabilization, sub-picosecond deviation (TDEV) was achieved at integration times between 1 105 s over 53 km deployed fiber. Over same periods, 10-ps level TDEV observed using White...
We report on the first deployment of a ytterbium (Yb) transportable optical lattice clock (TOLC), commercially shipping 3,000 km from Boulder, Colorado to Washington DC. The system, composed rigidly mounted reference cavity, atomic physics package, and an frequency comb, fully realizes independent standard for comparisons in microwave domains. shipped Yb TOLC was operational within 2 days arrival, enabling with rubidium (Rb) fountains at United States Naval Observatory (USNO). To best our...
While optical clock technology has advanced rapidly in recent years, incorporating the into operational timescales progressed more slowly. The highest accuracy frequency standards for groundbreaking measurements do not easily translate to critical timing where continuous, uninterrupted operation over many months and years is required. For example, intermittent steering of a hydrogen maser with an standard fails harness all dramatic improvements possible technology. Here we present progress...
We observe bimodal fluorescence patterns from atoms in a fast atomic beam when the laser excitation occurs presence of magnetic field and sample only portion profile. The behavior is well explained by competition between local intensity laser, which tends to generate coherent-population-trapping (CPT) dark state J = 1 J' 0 system, strength an applied that can frustrate CPT process. This work relevant for understanding optimizing detection process clocks or other coherent systems utilizing...
We demonstrate electromagnetically induced transparency with the control laser in a Laguerre-Gaussian mode. The transmission spectrum is studied an ultracold gas for D2 line both $^{85}$Rb and $^{87}$Rb, where decoherence due to diffusion of atomic medium negligible. compare these results similar configuration, but fundamental model probe under configurations, we find good agreement experiment. conclude that use modes narrower resonance linewidths as compared uniform intensity. narrowing...
Summary We present a scheme for integrating optical clock technology into an operational timescale. Using telecom laser stabilized to high-finesse cavity and frequency comb, we generate low-phase noise microwaves that can be steered using rubidium (Rb) fountain improve long-term stability. The system has promising robustness improves the performance of Rb fountain. photonic microwave integrated directly timescale best short-term performance, or used steer H maser maximum reliability.
Interferometric stability of polarization-entangled photons in quantum repeaters for long time intervals is an important capability future scalable networks linked over distances greater than hundreds kilometers. A memory node a necessary component the repeater, where entanglement prepared and swapped to extend entangled states from remote distant nodes. Room temperature fluctuations can have significant effects on phase polarization stored memory. Although common-path stabilization has been...