A5050998584- Quantum Information and Cryptography
- Cold Atom Physics and Bose-Einstein Condensates
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Quantum Mechanics and Applications
- Advanced Frequency and Time Standards
- Quantum optics and atomic interactions
- Atomic and Molecular Physics
- Quantum Computing Algorithms and Architecture
- Superconducting Materials and Applications
- Advanced NMR Techniques and Applications
- Laser-Matter Interactions and Applications
- Mechanical and Optical Resonators
- Spectroscopy and Quantum Chemical Studies
- Nuclear Physics and Applications
- Advanced Fiber Laser Technologies
- Gyrotron and Vacuum Electronics Research
- Electrochemical Analysis and Applications
- Neural Networks and Reservoir Computing
- Diamond and Carbon-based Materials Research
- Nuclear physics research studies
- Solar and Space Plasma Dynamics
- Mass Spectrometry Techniques and Applications
- Ionosphere and magnetosphere dynamics
University of Washington
2014-2025
Seattle University
2018
Sandia National Laboratories
2011
University of Michigan–Ann Arbor
1998-2007
Emerald Coast Science Center
2003-2006
Coherent (United States)
2003
Michigan United
1998
Institute for High Energy Physics
1998
Moscow State University
1994-1998
Krasnodar Research Institute of Storage and Processing of Agricultural Products
1977
We report the measurement of a Bell inequality violation with single atom and photon prepared in probabilistic entangled state. This is first demonstration such particles different species. The entanglement characterization this hybrid system may also be useful quantum information applications.
We report on ground-state laser cooling of single $^{111}\mathrm{Cd}^{+}$ ions confined in radio-frequency (Paul) traps. Heating rates trapped ion motion are measured for two different trapping geometries and electrode materials, where no effort was made to shield the electrodes from atomic $\mathrm{Cd}$ source. The low heating suggest that may be well suited experiments involving quantum control motion, including applications information science.
We propose to combine neutral atom and trapped ion qubits in one scalable modular architecture that uses shuttling of individual atoms optical tweezers realize atomic interconnects between quantum registers. These are deterministic, thus may be performed on-demand. The proposed protocol is as follows: a tweezer-trapped qubit brought close an chain serving module larger computer, entangling gate the two qubits. Then quickly moved another, nearby same trap entangled with chain, separate...
We investigate the structural properties and melting behaviors of two-dimensional ion crystals in an RF trap, focusing on effects temperature trap potential symmetry. identify distinct crystal structures that form under varying trapping conditions temperatures through experimental observations theoretical analyses. As increases or becomes more symmetric, we observe a transition from lattice arrangement to elongated ring-like formations aligned along axes. Our efforts enhance our...
We sympathetically cool a trapped 112Cd+ ion by directly Doppler-cooling 114Cd+ in the same trap. This is first demonstration of optically addressing single being cooled different species ion. Notably, experiment uses laser source, and does not require strong focusing. paves way toward reducing decoherence an trap quantum computer based on Cd+ isotopes.
We propose a method fur scaling trapped ions large-scale quantum computation and communication based on probabilistic ion photon mapping. Deterministic gates between remotely located can be achieved through detection of spontaneously-emitted photons, accompanied by the local Coulomb interaction neighboring ions. discuss gate speeds tolerance to experimental noise for different entanglement schemes.
Distributed quantum information processing requires a reliable memory and faithful carrier of information. Atomic qubits have very long coherence times are thus excellent candidates for storage, whereas photons ideal the transport as they can travel distances with minimum decoherence. We discuss theoretical experimental combination these two systems their use not only transfer but also scalable computation architectures.
In this paper, direct observation of micromotion for multiple ions in a laser-cooled trapped ion crystal is discussed along with measurement technique amplitude. Micromotion directly observed using time-resolving, single-photon-sensitive camera that provides both fluorescence and position data each on the nanosecond time scale. amplitude phase are measured, allowing method to be sensitive tilts shifts chain from null radio-frequency quadrupole potential linear trap. Spatial resolution makes...
We propose a method for scaling trapped ions large-scale quantum computation and communication based on probabilistic ion-photon mapping. Deterministic gates between remotely located can be achieved through detection of spontaneously-emitted photons, accompanied by the local Coulomb interaction neighboring ions. discuss gate speeds tolerance to experimental noise different entanglement schemes.
State preparation, qubit rotation, and high fidelity readout are demonstrated for two different $^{137}\mathrm{Ba}{}^{+}$ types. First, an optical on the narrow $6{S}_{1/2}$ to $5{D}_{5/2}$ transition at 1.76 $\ensuremath{\mu}$m is implemented. Then, leveraging techniques developed there readout, a ground-state hyperfine using magnetically insensitive 8 GHz accomplished.
We study the Doppler-cooling of radial two-dimensional (2D) Coulomb crystals trapped barium ions in a radiofrequency trap. Ions 2D experience micromotion an amplitude that increases linearly with distance from trap center, leading to position-dependent frequency modulation laser light each ion's rest frame. use two tones separated by approximately 100~MHz efficiently cool distinct regions differing amplitudes micromotion. This technique allows us and more than 50 populating 4 shells crystal,...
We recently studied the spin flipping of a vertically polarized, stored 139-MeV proton beam. To flip spin, we induced an rf depolarizing resonance by sweeping our solenoid magnet's frequency through frequency. With multiple flips, found polarization loss 0.0000 \ifmmode\pm\else\textpm\fi{} 0.0005 per under best conditions; this increased significantly for small changes in conditions. Minimizing depolarization during each is especially important because frequent could reduce systematic errors...
We present a measurement of the branching ratios from $6{P}_{3∕2}$ state $\mathrm{Ba}\phantom{\rule{0.2em}{0ex}}\mathrm{II}$ into all dipole-allowed decay channels ($6{S}_{1∕2}$, $5{D}_{3∕2}$, and $5{D}_{5∕2}$). Measurements were performed on single $^{138}{\mathrm{Ba}}^{+}$ ions in linear Paul trap with frequency-doubled mode-locked Ti:sapphire laser resonant $6{S}_{1∕2}\ensuremath{\rightarrow}6{P}_{3∕2}$ transition at $455\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ by detection electron...
Efficient collection of fluorescence from trapped ions is crucial for quantum optics and computing applications, specifically qubit state detection in generating single photons ion-photon remote ion entanglement. In a typical setup, only few percent the intercepted by aperture imaging optics. We employ simple metallic spherical mirror integrated with linear Paul trap to achieve photon efficiency at least $10%$ Ba${}^{+}$ ion. An aspheric corrector used reduce aberrations caused high image quality.
We report precision measurements of the excited state lifetime $5p$ $^{2}P_{1∕2}$ and $^{2}P_{3∕2}$ levels a single trapped ${\mathrm{Cd}}^{+}$ ion. Combining ion trap ultrafast laser technologies, is with picosecond pulses from mode-locked distribution arrival times spontaneously emitted photons recorded. The resulting lifetimes are $3.148\ifmmode\pm\else\textpm\fi{}0.011\phantom{\rule{0.3em}{0ex}}\mathrm{ns}$ $2.647\ifmmode\pm\else\textpm\fi{}0.010\phantom{\rule{0.3em}{0ex}}\mathrm{ns}$...
We present a measurement of the branching fractions for decay from long-lived $5{D}_{5/2}$ level in ${^{138}\mathrm{Ba}}^{+}$. The fraction into $6{S}_{1/2}$ ground state was found to be $0.846{(25)}_{\mathrm{stat}}{(4)}_{\mathrm{sys}}$. also report an improved lifetime, ${\ensuremath{\tau}}_{5{D}_{5/2}}=31.2(0.9)$ s. Together these measurements provide experimental determination transition rates out level. low ($<7\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}12}$ Torr) pressure ion...
Qubit state detection is an important part of a quantum computation. As number qubits in register increases, it necessary to maintain high fidelity accurately measure the multi-qubit state. Here we present experimental demonstration high-fidelity trapped ion with average single qubit error 4.2(1.5) ppm and 4-qubit 17(2) ppm, limited by decay lifetime qubit, using novel single-photon-sensitive camera fast data collection, excellent temporal spatial resolution, low instrumental crosstalk.
Email Share with Facebook on X Post reddit LinkedIn Add to Mendeley BibSonomy WeChat Get Citation Copy Text D. L. Moehring, B. Blinov, M. J. Madsen, Duan, and C. Monroe, "Observation of entanglement between a single trapped atom photon," in Conference Lasers Electro-Optics/International Quantum Electronics Photonic Applications Systems Technologies, Technical Digest (CD) (Optica Publishing Group, 2004), paper IPDA5. Export BibTex Endnote (RIS) HTML Plain alert Save article
We report on an experimental investigation of rapid adiabatic passage (RAP) in a trapped barium ion system. RAP is implemented the transition from $6S_{1/2}$ ground state to metastable $5D_{5/2}$ level by applying laser at 1.76 $\mu$m. focus interplay frequency noise and power shaping effectiveness RAP, which commonly assumed be robust tool for high efficiency population transfer. However, we note that reaching transfer fidelity requires combination small linewidth large Rabi frequency.
Atomic cadmium ions are loaded into radiofrequency ion traps by photoionization of atoms in a vapor with ultrafast laser pulses. The is driven through an intermediate atomic resonance frequency-quadrupled mode-locked Ti:Sapphire that produces pulses either 100 fsec or 1 psec duration at central wavelength 229 nm. large bandwidth the photoionizes all velocity classes Cd vapor, resulting high loading efficiencies compared to previous trap techniques. Measured rates simple theoretical model,...
We demonstrate broadband laser cooling of atomic ions in an rf trap using ultrafast pulses from a modelocked laser. The temperature single ion is measured by observing the size time-averaged image known harmonic potential. While lowest observed was only about 1 K, this method efficiently cools very hot atoms and can sufficiently localize trapped to produce near diffraction-limited images.
Efficient collection and analysis of trapped ion qubit fluorescence is essential for robust state detection in quantum computing schemes. We discuss simple techniques improving photon efficiency using high numerical aperture (N.A.) reflective optics. To test these we placed a spherical mirror with an effective N.A. about 0.9 inside vacuum chamber the vicinity linear Paul trap. demonstrate stable reliable trapping single barium ions, excellent agreement our simulations electric field this...
Trapped, laser-cooled ions produce intense fluorescence. Detecting this fluorescence enables efficient measurement of quantum state qubits based on trapped atoms. It is desirable to collect a large fraction the photons make detection faster and more reliable. Additionally, collection can improve speed fidelity remote ion entanglement gates. Here we show novel trap design that incorporates metallic spherical mirror as integral part itself, being its RF electrode. The geometry up 35% solid...