A5061061480- Advanced Frequency and Time Standards
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Quantum Information and Cryptography
- Advanced Fiber Laser Technologies
- Quantum optics and atomic interactions
- Scientific Measurement and Uncertainty Evaluation
- Laser-Plasma Interactions and Diagnostics
- Spectroscopy and Laser Applications
- Laser-induced spectroscopy and plasma
- Geophysics and Sensor Technology
- Quantum Mechanics and Applications
- Gamma-ray bursts and supernovae
- Mass Spectrometry Techniques and Applications
- High-pressure geophysics and materials
- Laser-Matter Interactions and Applications
- Cardiovascular Syncope and Autonomic Disorders
- Astro and Planetary Science
- Atomic and Molecular Physics
- Spectroscopy and Quantum Chemical Studies
- Dark Matter and Cosmic Phenomena
- Advanced Electrical Measurement Techniques
- Hemodynamic Monitoring and Therapy
- Quantum Computing Algorithms and Architecture
- Analytical Chemistry and Sensors
National Institute of Standards and Technology
2015-2025
University of Colorado Boulder
2017-2025
University of California, Los Angeles
2023-2025
University of Colorado System
2025
UCLA Health
2023
Joint Institute for Laboratory Astrophysics
2017
MIT-Harvard Center for Ultracold Atoms
2006-2011
Massachusetts Institute of Technology
2006-2009
University of Michigan
2004-2006
We describe an optical atomic clock based on quantum-logic spectroscopy of the ^{1}S_{0}↔^{3}P_{0} transition in ^{27}Al^{+} with a systematic uncertainty 9.4×10^{-19} and frequency stability 1.2×10^{-15}/sqrt[τ]. A ^{25}Mg^{+} ion is simultaneously trapped used for sympathetic cooling state readout. Improvements new trap have led to reduced secular motion heating, compared previous clocks, enabling operation near three-dimensional ground state. Operating lower drive has excess micromotion...
Dense arrays of trapped ions provide one way scaling up ion trap quantum information processing. However, miniaturization traps is currently limited by sharply increasing motional state decoherence at sub-$100\text{ }\text{ }\ensuremath{\mu}\mathrm{m}$ ion-electrode distances. We characterize heating rates in cryogenically cooled surface-electrode traps, with characteristic sizes the 75 to $150\text{ range. Upon cooling 6 K, measured are suppressed 7 orders magnitude, 2 magnitude below...
We report on Raman sideband cooling of ^{25}Mg^{+} to sympathetically cool the secular modes motion in a ^{25}Mg^{+}-^{27}Al^{+} two-ion pair near three-dimensional (3D) ground state. The evolution Fock-state distribution during process is studied using rate-equation simulation, and various heating sources that limit efficiency 3D our system are discussed. characterize residual energy rates all estimate time-dilation shift -(1.9±0.1)×10^{-18} for an ^{27}Al^{+} clock at typical probe...
Abstract Optical atomic clocks are the most accurate and precise measurement devices of any kind, enabling advances in international timekeeping, Earth science, fundamental physics, more. However, there is a tradeoff between accuracy precision, where higher precision achieved by using more atoms, but this comes at cost larger interactions atoms that limit accuracy. Here, we propose many-ion optical clock based on three-dimensional Coulomb crystals order one thousand Sn 2+ ions confined...
Electric field noise from fluctuating patch potentials is a significant problem for broad range of precision experiments, including trapped ion quantum computation and single spin detection. Recent results demonstrated strong suppression this by cryogenic cooling, suggesting an underlying thermal process. We present measurements characterizing the temperature frequency dependence 7 to 100 K, using ${\mathrm{Sr}}^{+}$ $75\text{ }\text{ }\ensuremath{\mu}\mathrm{m}$ above surface gold plated...
Chiaverini et al. [Quantum Inf. Comput. 5, 419 (2005)] recently suggested a linear Paul trap geometry for ion-trap quantum computation that places all of the electrodes in plane. Such planar ion traps are compatible with modern semiconductor fabrication techniques and can be scaled to make compact, many-zone traps. In this paper we present an experimental realization using on printed circuit board chains tens charged particles...
We report a demonstration and quantitative characterization of one-dimensional cavity cooling single trapped (88)Sr(+) ion in the resolved-sideband regime. measure spectrum transitions, rates heating cooling, steady-state limit. The dynamics limit 22.5(3) motional quanta, limited by moderate coupling between cavity, are consistent with simple model [Phys. Rev. A 64, 033405 (2001)] without any free parameters, validating rate equation for cooling.
We present an optical cavity design that is insensitive to both vibrations and orientation. The based on a spherical spacer held rigidly at two points diameter of the sphere. Coupling support forces length reduced by holding sphere "squeeze angle" with respect axis. Finite element analysis used calculate acceleration sensitivity for ideal geometry as well several varieties fabrication errors. measured initial, sub-ideal version mounted 4.0(5)×10(-11)/g, 1.6(3)×10(-10)/g, 3.1(1)×10(-10)/g...
The last decade has seen unprecedented effort in dark matter model building at all mass scales coupled with the design of numerous new detection strategies. Transformative advances quantum technologies have led to a plethora high-precision sensors and strategies for ultralight ($<10\,$eV) bosonic that can be described by an oscillating classical, largely coherent field. This white paper focuses on searches wavelike scalar vector candidates.
This article reports the observation of dense, collapsed layer produced by a radiative shock in laboratory experiment. The experiment uses laser irradiation to accelerate thin solid-density material above 100km∕s, first probe such high velocities shock. turn drives wave through cylindrical volume Xe gas (at ∼6mg∕cm3). Radiation from shocked removes enough energy that increases density and collapses spatially. type system is relevant number astrophysical contexts, providing potential observe...
Understanding molecular state evolution is central to many disciplines, including dynamics, precision measurement, and molecule-based quantum technology. Details of this are obscured when observing a statistical ensemble molecules. Here, we report real-time observations thermal radiation-driven transitions between individual states ("jumps") single molecule. We reversed these jumps through microwave-driven transitions, which resulted in 20-fold improvement the time molecule dwells chosen...
This paper shows results from experiments diagnosing the development of Rayleigh–Taylor instability with two-dimensional initial conditions at an embedded, decelerating interface. Experiments are performed Omega Laser and use ∼5 kJ energy to create a planar blast wave in dense, plastic layer that is followed by lower density foam layer. The single-mode interface has wavelength 50 μm amplitude 2.5 μm. Some targets supplemented additional modes. shocked then decelerated initially produces...
We characterize the frequency sensitivity of a cavity-stabilized laser to inertial forces and temperature fluctuations, perform real-time feedforward correct for these sources noise. measure cavity linear accelerations, rotational velocities by rotating it about three axes with accelerometers gyroscopes positioned around cavity. The worst-direction acceleration is $2(1)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}11}$ g${}^{\ensuremath{-}1}$ measured over 0--50 Hz, which reduced...
We operate a frequency-stable laser in non-laboratory environment where the test platform is passenger vehicle. measure acceleration experienced by and actively correct for it to achieve system sensitivity of $\Delta f / f$ = $11(2) \times 10^{-12}$/g, $6(2) $4(1) 10^{-12}$/g accelerations three orthogonal directions at 1 Hz. The spectrum performance are evaluated with vehicle both stationary moving. linewidth engine idling 1.7(1)
We present and analyze a method of laser frequency stabilization via steady-state patterns spectral holes in Eu$^{3+}$:Y$_2$SiO$_5$. Three regions are created, spaced by the ground state hyperfine splittings $~^{151}$Eu$^{3+}$. The absorption pattern is shown not to degrade after days stabilization. An optical comparison locked such spectral-hole with an independent cavity-stabilized Yb lattice clock demonstrates fractional instability $1.0\times10^{-15}~ \tau^{-\frac{1}{2}}$ that averages...
We develop differential measurement protocols that circumvent the laser noise limit in stability of optical clock comparisons by synchronous probing two clocks using phase-locked local oscillators. This allows for probe times longer than coherence time, avoids Dick effect, and supports Heisenberg-limited precision. present such frequency numerical simulations with realistic sources. These methods provide a route to reduce ratio durations more an order magnitude.
We characterize and model the Stark effect due to radio-frequency (rf) electric field experienced by a molecular ion in an rf Paul trap, leading systematic uncertainty of field-free rotational transition. The is deliberately displaced sample different known fields measure resultant shifts transition frequencies. With this method, we determine permanent dipole moment CaH^{+}, find close agreement with theory. characterization performed using frequency comb which probes transitions ion....
We demonstrate a method for loading surface electrode ion traps by electron impact ionization. The relies on the property of geometries that trap depth can be increased at cost more micromotion. By introducing buffer gas, we counteract rf heating assocated with micromotion and benefit from larger depth. After an initial trap, standard compensation techniques used to cancel stray fields resulting charged dielectric allow ultra-high vacuum.
We demonstrate loading of $^{88}\mathrm{Sr}^{+}$ ions by laser ablation into a mm-scale surface-electrode ion trap. The used for is pulsed, frequency-tripled Nd:YAG with pulse energies $1--10\phantom{\rule{0.3em}{0ex}}\mathrm{mJ}$ and durations $4\phantom{\rule{0.3em}{0ex}}\mathrm{ns}$. An additional not required to photoionize the ablated material. efficiency lifetime several candidate materials target are characterized measuring trapped fluorescence signal number consecutive loads....
A scalable, multiplexed ion trap for quantum information processing is fabricated and tested. The design fabrication process are optimized scalability to small size large numbers of interconnected traps, integration control electronics optics. Multiple traps with similar designs tested 111Cd+, 25Mg+, 88Sr+ ions at room temperature 6 K, respective lifetimes 90 s, 300 ± 30 56 4.5 1.1 hours. motional heating rate 25Mg+ a frequency 1.6 MHz measured be 7 3 quanta per millisecond. For K 540 kHz...