A5067783194- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Quantum Information and Cryptography
- Quantum optics and atomic interactions
- Quantum, superfluid, helium dynamics
- Quantum many-body systems
- Advanced Frequency and Time Standards
- Physics of Superconductivity and Magnetism
- Quantum Mechanics and Applications
- Strong Light-Matter Interactions
- Quantum and electron transport phenomena
- Mechanical and Optical Resonators
- Spectroscopy and Laser Applications
- Quantum Computing Algorithms and Architecture
- Topological Materials and Phenomena
- Spectroscopy and Quantum Chemical Studies
- Photonic and Optical Devices
- Neural Networks and Reservoir Computing
- Opinion Dynamics and Social Influence
- Theoretical and Computational Physics
- Advanced Fiber Laser Technologies
- Advanced Condensed Matter Physics
- Advanced Chemical Physics Studies
- Quantum chaos and dynamical systems
- Advanced Thermodynamics and Statistical Mechanics
University of Colorado Boulder
2016-2025
Joint Institute for Laboratory Astrophysics
2016-2025
University of Colorado System
2012-2025
National Institute of Standards and Technology
2014-2024
Quantum Group (United States)
2024
Universidad de Montevideo
2024
Universidad de la República
2024
Centro Uruguayo de Imagenología Molecular
2024
University of California, Santa Barbara
2011-2022
National Institute of Standards
2022
Quantum mechanical superexchange interactions form the basis of quantum magnetism in strongly correlated electronic media. We report on direct measurement with ultracold atoms optical lattices. After preparing a spin-mixture an antiferromagnetically ordered state, we measure coherent superexchange-mediated spin dynamics coupling energies from 5 Hz up to 1 kHz. By dynamically modifying potential bias between neighboring lattice sites, magnitude and sign interaction can be controlled, thus...
Quantum simulation of spin models can provide insight into complex problems that are difficult or impossible to study with classical computers. Trapped ions an established platform for quantum simulation, but only systems fewer than 20 have demonstrated correlations. Here we non-equilibrium, dynamics arising from engineered, homogeneous Ising interaction in a two-dimensional array $^9$Be$^+$ Penning trap. We verify entanglement the form spin-squeezed states up 219 ions, directly observing...
SU(N) symmetry can emerge in a quantum system with N single-particle spin states when is decoupled from inter-particle interactions. So far, only indirect evidence for this exists, and the scattering parameters remain largely unknown. Here we report first spectroscopic observation of SU(N=10) Sr-87 using state-of-the-art measurement precision offered by an ultra-stable laser. By encoding electronic orbital degree freedom two clock states, while keeping open to 10 nuclear sublevels, probe...
By selecting two dressed rotational states of ultracold polar molecules in an optical lattice, we obtain a highly tunable generalization the t-J model, which refer to as t-J-V-W model. In addition XXZ spin exchange, model features density-density interactions and density-spin interactions; all are dipolar. We show that full control interaction parameters both magnitude sign can be achieved independently each other tunneling. As first step towards demonstrating potential system, apply density...
We have realized long-lived ground-state polar molecules in a 3D optical lattice, with lifetime of up to 25 s, which is limited only by off-resonant scattering the trapping light. Starting from 2D we observe that increases dramatically as small lattice potential added along tube-shaped traps. The also for weakly bound Feshbach molecules. For pure gas molecules, >20 s lattice; this represents 100-fold improvement over previous results. This scattering, rate related size molecule. Individually...
The quantum statistics of atoms is typically observed in the behavior an ensemble via macroscopic observables. However, modifies even two particles. Here, we demonstrate near-complete control over all internal and external degrees freedom laser-cooled (87)Rb trapped optical tweezers. This controllability allows us to observe signatures indistinguishability two-particle interference. Our work establishes tweezers as a promising route bottom-up engineering scalable, low-entropy systems.
Scrambling is the process by which information stored in local degrees of freedom spreads over many-body a quantum system, becoming inaccessible to probes and apparently lost. entanglement can reconcile seemingly unrelated behaviors including thermalization isolated systems loss black holes. Here, we demonstrate that fidelity out-of-time-order correlators (FOTOCs) elucidate connections between scrambling, entanglement, ergodicity chaos (butterfly effect). We compute FOTOCs for paradigmatic...
We use Ramsey spectroscopy to experimentally probe the quantum dynamics of disordered dipolar-interacting ultracold molecules in a partially filled optical lattice, and we compare results theory. report capability control dipolar interaction strength. find excellent agreement between our measurements spin theoretical calculations with no fitting parameters, including dynamics' dependence on molecule number This verifies microscopic model expected govern molecules, even this strongly...
We investigate collective emission from coherently driven ultracold $ ^{88} Sr atoms. perform two sets of experiments, using a strong and weak transition that are insensitive sensitive, respectively, to atomic motion at one microKelvin. observe highly directional forward with peak intensity is enhanced, for the transition, by > 10 ^3 compared in transverse direction. This accompanied substantial broadening spectral lines. For enhancement substantially reduced due motion. Meanwhile,...
Quantum enhanced sensing Harnessing quantum mechanical effects is expected to provide an advantage over classical technology. By entangling the center-of-mass motional state of approximately 150 ions trapped in a two-dimensional Coulomb crystal with their collective spin state, Gilmore et al . demonstrate quantum-enhanced measurement sensitivity displacement and electric field. Such could, for instance, find application probing proposed weak interactions between dark matter normal matter, as...
We study Mott insulators of fermionic alkaline earth atoms, described by Heisenberg spin models with enhanced $\mathrm{SU}(N)$ symmetry. In dramatic contrast to SU(2) magnetism, more than two spins are required form a singlet. On the square lattice, classical ground state is highly degenerate and magnetic order thus unlikely. large-$N$ limit, we find chiral liquid topological Abelian fractional statistics. discuss its experimental detection. Chiral liquids non-Abelian anyons may also be...
We show that dipolar interactions between ultracold polar alkali dimers in optical lattices can be used to realize a highly tunable generalization of the t-J model, which we refer as t-J-V-W model. The model features long-range spin-spin J_z and J_perp XXZ type, density-density interaction V, density-spin W, all controlled both magnitude sign independently each other tunneling t. "spin" is encoded rotational degree freedom molecules, while are by applied static electric continuous-wave...
Optical lattice clocks with extremely stable frequency are possible when many atoms interrogated simultaneously, but this precision may come at the cost of systematic inaccuracy resulting from atomic interactions. Density-dependent shifts can occur even in a clock that uses fermionic if they subject to inhomogeneous optical excitation. However, sufficiently strong interactions suppress collisional sites containing more than one atom. We demonstrated effectiveness approach strontium by...
Strongly interacting quantum many-body systems are fundamentally compelling and ubiquitous in science. However, their complexity generally prevents exact solutions of dynamics. Precisely engineered ultracold atomic gases emerging as a powerful tool to unravel these challenging physical problems. Here we present new laboratory for the study effects: strongly two-level formed by clock states ${}^{87}$Sr, which used realize neutral atom optical that performs at highest level optical-atomic...
We investigate theoretically the suppression of two-body losses when on-site loss rate is larger than all other energy scales in a lattice. This work quantitatively explains recently observed chemical reactions between two rotational states fermionic KRb molecules confined one-dimensional tubes with weak lattice along [Yan et al., Nature (London) 501, 521 (2013)]. New measurements performed for different parameters but under controlled initial conditions allow us to show that consequence...
We propose and analyze a novel approach to quantum information processing, in which multiple qubits can be encoded manipulated using electronic nuclear degrees of freedom associated with individual alkaline-earth-metal atoms trapped an optical lattice. Specifically, we describe how the within each register individually measured subwavelength resolution. also show such few-qubit registers coupled other superlattices via conditional tunneling form scalable network. Finally, potential...