A5080554933- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Atomic and Molecular Physics
- Advanced Frequency and Time Standards
- Advanced Chemical Physics Studies
- Dark Matter and Cosmic Phenomena
- Nuclear physics research studies
- Quantum, superfluid, helium dynamics
- Quantum optics and atomic interactions
- Quantum Information and Cryptography
- Quantum Mechanics and Applications
- Advanced Fiber Laser Technologies
- Particle physics theoretical and experimental studies
- Cosmology and Gravitation Theories
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- Scientific Research and Discoveries
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced NMR Techniques and Applications
- Spectroscopy and Laser Applications
- Nuclear Physics and Applications
- Quantum and Classical Electrodynamics
- Radioactive Decay and Measurement Techniques
- Spectroscopy and Quantum Chemical Studies
- Electron and X-Ray Spectroscopy Techniques
University of Nevada, Reno
2016-2025
ORCID
2021
Joint Quantum Institute
2018
National Institute of Standards and Technology
2018
University of Maryland, College Park
2018
University of Delaware
2018
Center for Astrophysics Harvard & Smithsonian
1999-2016
Chinese Academy of Sciences
2016
Harvard University
2000-2016
UNSW Sydney
2008-2010
Advances in atomic physics, such as cooling and trapping of atoms molecules developments frequency metrology, have added orders magnitude to the precision atom-based clocks sensors. Applications extend beyond physics this article reviews using these new techniques address important challenges look for variations fundamental constants, search interactions standard model particle test principles general relativity.
Abstract We propose in this White Paper a concept for space experiment using cold atoms to search ultra-light dark matter, and detect gravitational waves the frequency range between most sensitive ranges of LISA terrestrial LIGO/Virgo/KAGRA/INDIGO experiments. This interdisciplinary experiment, called Atomic Experiment Dark Matter Gravity Exploration (AEDGE), will also complement other planned searches exploit synergies with wave detectors. give examples extended sensitivity matter offered...
The 7.6(5) eV nuclear magnetic-dipole transition in a single $^{229}\mathrm{Th}^{3+}$ ion may provide the foundation for an optical clock of superb accuracy. A virtual composed stretched states within $5{F}_{5/2}$ electronic ground level both and isomeric manifolds is proposed. It shown to offer unprecedented systematic shift suppression, allowing performance with total fractional inaccuracy approaching $1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}19}$.
We conduct frequency comparisons between a state-of-the-art strontium optical lattice clock, cryogenic crystalline silicon cavity, and hydrogen maser to set new bounds on the coupling of ultralight dark matter Standard Model particles fields in mass range $10^{-16}$ $-$ $10^{-21}$ eV. The key advantage this two-part ratio comparison is differential sensitivities time variation both fine-structure constant electron mass, achieving substantially improved limit moduli matter, particularly at...
Numerous theories extending beyond the standard model of particle physics predict existence bosons that could constitute dark matter (DM) permeating universe. In halo (SHM) galactic velocity distribution bosonic DM field defines a characteristic coherence time $\tau_c$. Until recently, laboratory experiments searching for fields have been in regime where measurement $T$ significantly exceeds $\tau_c$, so null results interpreted as constraints on coupling to particles with amplitude $\Phi_0$...
LiSrAlF_{6} crystals doped with ^{229}Th are used in a laser-based search for the nuclear isomeric transition. Two spectroscopic features near transition energy observed. The first is broad excitation feature that produces redshifted fluorescence decays timescale of few seconds. second narrow, laser-linewidth-limited spectral at 148.382 19(4)_{stat}(20)_{sys} nm [2020 407.3(5)_{stat}(30)_{sys} GHz] lifetime 568(13)_{stat}(20)_{sys} s. This assigned to state, whose found be 8.355...
This document presents a summary of the 2023 Terrestrial Very-Long-Baseline Atom Interferometry Workshop hosted by CERN. The workshop brought together experts from around world to discuss exciting developments in large-scale atom interferometer (AI) prototypes and their potential for detecting ultralight dark matter gravitational waves. primary objective was lay groundwork an international TVLBAI proto-collaboration. collaboration aims unite researchers different institutions strategize...
The van der Waals coefficients for the alkali-metal atoms from Na to Fr interacting in their ground states are calculated using relativistic ab initio methods. accuracy of calculations is estimated by also evaluating atomic static electric-dipole polarizabilities and interaction with a perfectly conducting wall. results excellent agreement latest data studies magnetic field induced Feshbach resonances ultracold collisions Rb atoms. For Cs we provide critically needed collision studies.
Removal energies and hyperfine constants of the lowest four $ns,$ ${\mathrm{np}}_{1/2},$ ${\mathrm{np}}_{3/2}$ states in Na, K, Rb, Cs are calculated; removal $n=7--10$ $n=7$ 8 Fr also calculated. The calculations based on relativistic single-double (SD) approximation which single double excitations Dirac-Hartree-Fock wave functions included to all orders perturbation theory. Using SD functions, accurate values energies, electric-dipole matrix elements, static polarizabilities obtained;...
Blackbody radiation (BBR) shifts of the $^{3}P_{0}\text{\ensuremath{-}}^{1}S_{0}$ clock transition in divalent atoms Mg, Ca, Sr, and Yb are evaluated. The dominant electric-dipole contributions computed using accurate relativistic many-body techniques atomic structure. At room temperatures, resulting uncertainties $E1$ BBR large substantially affect projected ${10}^{\ensuremath{-}18}$ fractional accuracy optical-lattice-based clocks. A peculiarity these clocks is that characteristic...
We carry out high-precision calculation of parity violation in a cesium atom, reducing theoretical uncertainty by factor 2 compared to previous evaluations. combine measurements with calculations and extract the weak charge 133Cs nucleus, QW=-73.16(29)expt(20)theor. The result is agreement standard model (SM) elementary particles. This most accurate to-date test low-energy electroweak sector SM. In combination results high-energy collider experiments, we confirm energy dependence (or...
Recently invented and demonstrated, optical lattice clocks hold great promise for improving the precision of modern timekeeping. These aim at 10^-18 fractional accuracy, which translates into a clock that would neither lose or gain fraction second over an estimated age Universe. In these clocks, millions atoms are trapped interrogated simultaneously, dramatically stability. Here we discuss principles operation and, in particular, novel concept "magic" trapping lattices. We also highlight...
We report vapor-cell magneto-optical trapping of Hg isotopes on the (1)S(0)-(3)P(1) intercombination transition. Six abundant isotopes, including four bosons and two fermions, were trapped. is heaviest nonradioactive atom trapped so far, which enables sensitive atomic searches for "new physics" beyond standard model. propose an accurate optical lattice clock based evaluate its systematic accuracy to be better than 10;{-18}. Highly stable Hg-based clocks will provide a new avenue research...
We propose a novel class of atomic clocks based on highly charged ions. consider forbidden laser-accessible transitions within the $4{f}^{12}$ ground-state configurations Our evaluation systematic effects demonstrates that these may be used for building exceptionally accurate which compete in accuracy with recently proposed nuclear clocks.
A method is proposed to detect some candidates of dark matter with a network precision-measurement devices such as atomic clocks. Spatiotemporal correlation functions the ultralight dark-matter fields are derived for formalizing scheme.
Abstract Ultralight bosons such as axion-like particles are viable candidates for dark matter. They can form stable, macroscopic field configurations in the of topological defects that could concentrate matter density into many distinct, compact spatial regions small compared with Galaxy but much larger than Earth. Here we report results search transient signals from domain walls by using global network optical magnetometers exotic (GNOME) physics searches. We data, consisting correlated...
Abstract We summarise the discussions at a virtual Community Workshop on Cold Atoms in Space concerning status of cold atom technologies, prospective scientific and societal opportunities offered by their deployment space, developments needed before atoms could be operated space. The technologies discussed include atomic clocks, quantum gravimeters accelerometers, interferometers. Prospective applications metrology, geodesy measurement terrestrial mass change due to, e.g., climate change,...
Abstract Recent advances in optical atomic clocks and time transfer have enabled new possibilities precision metrology for both tests of fundamental physics timing applications. Here we describe a space mission concept that would place state-of-the-art clock an eccentric orbit around Earth. A high stability laser link connect the relative time, range, velocity orbiting spacecraft to earthbound stations. The primary goal this be test gravitational redshift, classical general relativity, with...
van der Waals coefficients for the heteronuclear alkali-metal dimers of Li, Na, K, Rb, Cs, and Fr are calculated using relativistic ab initio methods augmented by high-precision experimental data. We argue that uncertainties in unlikely to exceed about 1%.
We report calculations assessing the ultimate precision of an atomic clock based on 578 nm $6{}^{1}{S}_{0}\ensuremath{\rightarrow}6{}^{3}{P}_{0}$ transition in Yb atoms confined optical lattice trap. find that this has a natural linewidth less than 10 mHz odd isotopes, caused by hyperfine coupling. The shift due to trapping light acting through lowest order ac polarizability is found become zero at magic trap wavelength about 752 nm. effects Rayleigh scattering, multipole polarizabilities,...
We discuss results of the most accurate to-date test low-energy electroweak sector standard model elementary particles. Combining previous measurements with our high-precision calculations we extracted weak charge $^{133}\mathrm{Cs}$ nucleus, ${Q}_{W}=\ensuremath{-}73.16(29{)}_{\mathrm{exp}}(20{)}_{\mathrm{th}}$ [S. G. Porsev, K. Beloy, and A. Derevianko, Phys. Rev. Lett. 102, 181601 (2009)]. The result is in perfect agreement ${Q}_{W}^{\mathrm{SM}}$ predicted by model,...