A5005759724- Quantum Information and Cryptography
- Quantum Computing Algorithms and Architecture
- Quantum Mechanics and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum optics and atomic interactions
- Quantum many-body systems
- Quantum and electron transport phenomena
- Atomic and Subatomic Physics Research
- Neural Networks and Reservoir Computing
- Advanced Frequency and Time Standards
- Laser-Matter Interactions and Applications
- Mechanical and Optical Resonators
- Advanced Thermodynamics and Statistical Mechanics
- Theoretical and Computational Physics
- Atomic and Molecular Physics
- Spectroscopy and Quantum Chemical Studies
- Electrochemical Analysis and Applications
- Advanced Fiber Laser Technologies
- Quantum-Dot Cellular Automata
- Opinion Dynamics and Social Influence
- Mass Spectrometry Techniques and Applications
- Scientific Measurement and Uncertainty Evaluation
- Ion-surface interactions and analysis
- Computational Physics and Python Applications
- Advanced NMR Techniques and Applications
Duke University
2020-2025
Joint Quantum Institute
2015-2024
University of Maryland, College Park
2015-2024
IonQ (United States)
2016-2024
Joint Center for Quantum Information and Computer Science
2016-2024
Keck Hospital of USC
2024
National Institute of Standards and Technology
2011-2023
Lawrence Berkeley National Laboratory
2023
University of California, Berkeley
2023
Google (United States)
2017
Single trapped ions represent elementary quantum systems that are well isolated from the environment. They can be brought nearly to rest by laser cooling, and both their internal electronic states external motion coupled manipulated light fields. This makes them ideally suited for quantum-optical quantum-dynamical studies under well-controlled conditions. Theoretical experimental work on these topics is reviewed in paper, with a focus radio-frequency (Paul) traps.
We demonstrate the operation of a two-bit "controlled-NOT" quantum logic gate, which, in conjunction with simple single-bit operations, forms universal gate for computation. The two bits are stored internal and external degrees freedom single trapped atom, which is first laser cooled to zero-point energy. Decoherence effects identified operation, possibility extending system more qubits appears promising.
Methods for, and limitations to, the generation of entangled states trapped atomic ions are examined.As much as possible, state manipulations described in terms quantum logic operations since conditional dynamics implicit is central to creation entanglement.Keeping with current interest, some experimental issues proposal for trappedion computation by J. I. Cirac P. Zoller (University Innsbruck) discussed.Several possible decoherence mechanisms examined what may be more important these...
A "Schrödinger cat''-like state of matter was generated at the single atom level. trapped 9 Be + ion laser-cooled to zero-point energy and then prepared in a superposition spatially separated coherent harmonic oscillator states. This created by application sequence laser pulses, which entangles internal (electronic) external (motional) states ion. The Schrödinger cat verified detection quantum mechanical interference between localized wave packets. mesoscopic system may provide insight into...
We report the creation of thermal, Fock, coherent, and squeezed states motion a harmonically bound ${}^{9}{\mathrm{Be}}^{+}$ ion. The last three are coherently prepared from an ion which has been initially laser cooled to zero point motion. is trapped in regime where coupling between its motional internal states, due applied (classical) radiation, can be described by Jaynes-Cummings-type interaction. With this coupling, evolution atomic state provides signature number distribution
We report laser cooling of a single $^{9}\mathrm{Be}^{+}$ ion held in rf (Paul) trap to where it occupies the quantum-mechanical ground state motion. With use resolved-sideband stimulated Raman cooling, zero point motion is achieved 98% time 1D and 92% 3D. Cooling zero-point energy appears be crucial prerequisite for future experiments such as realization simple quantum logic gates applicable computation.
Trapped atomic ions are standards for quantum information processing, serving as memories, hosts of gates in computers and simulators, nodes communication networks. Quantum bits based on trapped enjoy a rare combination attributes: They have exquisite coherence properties, they can be prepared measured with nearly 100% efficiency, readily entangled each other through the Coulomb interaction or remote photonic interconnects. The outstanding challenge is scaling to hundreds thousands qubits...
We reconstruct the density matrices and Wigner functions for various quantum states of motion a harmonically bound ${}^{9}{\mathrm{Be}}^{+}$ ion. apply coherent displacements different amplitudes phases to input state measure number populations. Using novel reconstruction schemes we independently determine both matrix in basis function. These reconstructions are sensitive indicators decoherence system.
We have produced a very cold sample of spin-polarized trapped atoms. The technique used dramatically simplifies the production laser-cooled In this experiment, 1.8\ifmmode\times\else\texttimes\fi{}${10}^{7}$ neutral cesium atoms were optically captured directly from low-pressure vapor in small glass cell. then cooled 1-${\mathrm{mm}}^{3}$ cloud and loaded it into low-field magnetic trap same magnetically had an effective temperature as low 1.1\ifmmode\pm\else\textpm\fi{}0.2...
We have prepared the internal states of two trapped ions in both Bell-like singlet and triplet entangled states. In contrast to all other experiments with either massive particles or photons, we do this a deterministic fashion, producing on demand without selection. The production is crucial prerequisite for large-scale quantum computation.
Laser-cooled and trapped atomic ions form an ideal standard for the simulation of interacting quantum spin models. Effective spins are represented by appropriate internal energy levels within each ion, can be measured with near-perfect efficiency using state-dependent fluorescence techniques. By applying optical fields that exert dipole forces on ions, their Coulomb interaction modulated to produce long-range tunable spin-spin interactions reconfigured shaping spectrum pattern laser fields,...