The Experts below are selected from a list of 34092 Experts worldwide ranked by ideXlab platform
Peter Zoller - One of the best experts on this subject based on the ideXlab platform.
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Holonomic quantum computation with Neutral Atoms
Physical Review A, 2002Co-Authors: Alessio Recati, J. Ignacio Cirac, Tommaso Calarco, Paolo Zanardi, Peter ZollerAbstract:We propose an all-geometric implementation of quantum computation using Neutral Atoms in cavity QED. We show how to perform generic single- and two-qubit gates, the latter by encoding a two-atom state onto a single, many-level atom. We compare different strategies to overcome limitations due to cavity imperfections.
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fast quantum gates for Neutral Atoms
Physical Review Letters, 2000Co-Authors: Dieter Jaksch, J. Ignacio Cirac, Peter Zoller, S L Rolston, Robin Cote, Mikhail D LukinAbstract:We propose several schemes for implementing a fast two-qubit quantum gate for Neutral Atoms with the gate operation time much faster than the time scales associated with the external motion of the Atoms in the trapping potential. In our example, the large interaction energy required to perform fast gate operations is provided by the dipole-dipole interaction of Atoms excited to low-lying Rydberg states in constant electric fields. A detailed analysis of imperfections of the gate operation is given.
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Quantum computing with Neutral Atoms
Journal of Modern Optics, 2000Co-Authors: Hans J Briegel, Dieter Jaksch, J. Ignacio Cirac, Tommaso Calarco, Peter ZollerAbstract:We develop a method to entangle Neutral Atoms using cold controlled collisions. We analyze this method in two particular set-ups: optical lattices and magnetic micro-traps. Both offer the possibility of performing certain multi-particle operations in parallel. Using this fact, we show how to implement efficient quantum error correction and schemes for fault-tolerant computing.
Mikhail D Lukin - One of the best experts on this subject based on the ideXlab platform.
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quantum network of atom clocks a possible implementation with Neutral Atoms
Physical Review Letters, 2016Co-Authors: Peter Komar, Turker Topcu, Eric Kessler, Andrei Derevianko, Vladan Vuletic, Mikhail D LukinAbstract:We propose a protocol for creating a fully entangled Greenberger-Horne-Zeilinger-type state of Neutral Atoms in spatially separated optical atomic clocks. In our scheme, local operations make use of the strong dipole-dipole interaction between Rydberg excitations, which give rise to fast and reliable quantum operations involving all Atoms in the ensemble. The necessary entanglement between distant ensembles is mediated by single-photon quantum channels and collectively enhanced light-matter couplings. These techniques can be used to create the recently proposed quantum clock network based on Neutral atom optical clocks. We specifically analyze a possible realization of this scheme using Neutral Yb ensembles.
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fast quantum gates for Neutral Atoms
Physical Review Letters, 2000Co-Authors: Dieter Jaksch, J. Ignacio Cirac, Peter Zoller, S L Rolston, Robin Cote, Mikhail D LukinAbstract:We propose several schemes for implementing a fast two-qubit quantum gate for Neutral Atoms with the gate operation time much faster than the time scales associated with the external motion of the Atoms in the trapping potential. In our example, the large interaction energy required to perform fast gate operations is provided by the dipole-dipole interaction of Atoms excited to low-lying Rydberg states in constant electric fields. A detailed analysis of imperfections of the gate operation is given.
S. A. Fuselier - One of the best experts on this subject based on the ideXlab platform.
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STATISTICAL ANALYSIS OF THE HEAVY Neutral Atoms MEASURED BY IBEX
The Astrophysical Journal Supplement Series, 2015Co-Authors: J. Park, Eberhard Möbius, S. A. Fuselier, Andre Galli, Harald Kucharek, George Livadiotis, David J. MccomasAbstract:We investigate the directional distribution of heavy Neutral Atoms in the heliosphere by using heavy Neutral maps generated with the IBEX-Lo instrument over three years from 2009 to 2011. The interstellar Neutral (ISN) O&Ne gas flow was found in the first-year heavy Neutral map at 601 keV and its flow direction and temperature were studied. However, due to the low counting statistics, researchers have not treated the full sky maps in detail. The main goal of this study is to evaluate the statistical significance of each pixel in the heavy Neutral maps to get a better understanding of the directional distribution of heavy Neutral Atoms in the heliosphere. Here, we examine three statistical analysis methods: the signal-to-noise filter, the confidence limit method, and the cluster analysis method. These methods allow us to exclude background from areas where the heavy Neutral signal is statistically significant. These methods also allow the consistent detection of heavy Neutral atom structures. The main emission feature expands toward lower longitude and higher latitude from the observational peak of the ISN O&Ne gas flow. We call this emission the extended tail. It may be an imprint of the secondary oxygen Atoms generated by charge exchange between ISN hydrogen Atoms and oxygen ions in the outer heliosheath.
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low energy Neutral Atoms from the heliosheath
The Astrophysical Journal, 2014Co-Authors: S. A. Fuselier, F Allegrini, M Bzowski, M A Dayeh, M I Desai, H O Funsten, Andre GalliAbstract:In the heliosheath beyond the termination shock, low energy (<0.5 keV) Neutral Atoms are created by charge exchange with interstellar Neutrals. Detecting these Neutrals from Earth's orbit is difficult because their flux is reduced substantially by ionization losses as they propagate from about 100 to 1 AU and because there are a variety of other signals and backgrounds that compete with this weak signal. Observations from IBEX-Lo and -Hi from two opposing vantage points in Earth's orbit established a lower energy limit of about 0.1 keV on measurements of energetic Neutral Atoms (ENAs) from the heliosphere and the form of the energy spectrum from about 0.1 to 6 keV in two directions in the sky. Below 0.1 keV, the detailed ENA spectrum is not known, and IBEX provides only upper limits on the fluxes. However, using some assumptions and taking constraints on the spectrum into account, we find indications that the spectrum turns over at an energy between 0.1 and 0.2 keV.
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energetic Neutral Atoms from the earth s subsolar magnetopause
Geophysical Research Letters, 2010Co-Authors: S. A. Fuselier, Eberhard Möbius, H O Funsten, D J Mccomas, P H Janzen, H Kucharek, D Heirtzler, T E Moore, S M PetrinecAbstract:The shocked solar wind in the Earth's magnetosheath becomes nearly stationary at the subsolar magnetopause. At this location, solar wind protons are Neutralized by charge exchange with Neutral hydrogen Atoms at the extreme limits of the Earth's tenuous exosphere. The resulting Energetic Neutral Atoms (ENAs) propagate away from the subsolar region in nearly all directions. Simultaneous observations of hydrogen ENAs from the Interstellar Boundary Explorer (IBEX) and proton distributions in the magnetosheath from the Cluster spacecraft are used to quantify this charge exchange process. By combining these observations with a relatively simple model, estimates are obtained for the ratio of ENA to shocked solar wind flux (about 10−4) and the exospheric density at distances greater than 10 Earth Radii (RE) upstream from the Earth (about 8 cm−3).
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Observations of Neutral Atoms from the solar wind
Journal of Geophysical Research: Space Physics, 2001Co-Authors: Michael R. Collier, Thomas E. Moore, James L. Burch, D. J. Chornay, John W. Keller, M.-c. Fok, Keith W. Ogilvie, Scott A. Boardsen, B. El Marji, S. A. FuselierAbstract:We report observations of Neutral Atoms from the solar wind in the Earth's vicinity with the low-energy Neutral atom (LENA) imager on the Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) spacecraft. This instrument was designed to be capable of looking at and in the direction of the Sun. Enhancements in the hydrogen count rate in the solar direction are not correlated with either solar ultraviolet emission or suprathermal ions and are deduced to be due to Neutral particles from the solar wind. LENA observes these particles from the direction closest to that of the Sun even when the Sun is not directly in LENA's 90° field of view. Simulations show that these Neutrals are the result of solar wind ions charge exchanging with exospheric Neutral hydrogen Atoms in the postshock flow of the solar wind in the magnetosheath. Their energy is inferred to exceed 300 eV, consistent with solar wind energies, based on simulation results and on the observation of oxygen ions, sputtered from the conversion surface in the time-of-flight spectra. In addition, the sputtered oxygen abundance tracks the solar wind speed, even when IMAGE is deep inside the magnetosphere. These results show that low-energy Neutral atom imaging provides the capability to directly monitor the solar wind flow in the magnetosheath from inside the magnetosphere because there is a continuous and significant flux of Neutral Atoms originating from the solar wind that permeates the magnetosphere.
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Low energy Neutral Atoms in the magnetosphere
Geophysical Research Letters, 2001Co-Authors: Thomas E. Moore, Michael R. Collier, James L. Burch, D. J. Chornay, S. A. Fuselier, A. G. Ghielmetti, Barbara L. Giles, D. C. Hamilton, Federico A. Herrero, John W. KellerAbstract:We report observations of low energy Neutral Atoms (LENA) from the solar wind and the ionosphere, obtained by the LENA Imager on the IMAGE spacecraft. The LENA Imager detects and images LENAs arriving at the spacecraft from within a 90° field of view (8° × 8° pixels), swept through 360° every two minutes by spacecraft spin. Neutral Atoms arriving at the sensor are converted to negative ions by a conversion surface. The resulting negative ions are separated in energy (3 bins, 10–250 eV) and arrival direction (±45°). They are then accelerated, detected, and time-of-flight mass analyzed. The solar wind and the ionosphere both emit measurable Neutral atom fluxes, the latter responding rapidly to to variations of the former.
Gerhard Rempe - One of the best experts on this subject based on the ideXlab platform.
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photon mediated quantum gate between two Neutral Atoms in an optical cavity
Physical Review X, 2018Co-Authors: Stephan Welte, Stephan Ritter, Bastian Hacker, Severin Daiss, Gerhard RempeAbstract:Quantum communication requires the ability for network nodes to send and receive photons as well as process quantum information. New experiments demonstrate just such a quantum gate, realized by two Neutral Atoms coupled by an optical photon.
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lossless state detection of single Neutral Atoms
Physical Review Letters, 2010Co-Authors: Jorg Bochmann, Martin Mucke, Christoph Guhl, Stephan Ritter, Gerhard Rempe, David MoehringAbstract:We introduce lossless state detection of trapped Neutral Atoms based on cavity-enhanced fluorescence. In an experiment with a single 87 Rb atom, a hyperfine-state-detection fidelity of 99.4% is achieved in 85 μs. The quantum bit is interrogated many hundreds of times without loss of the atom while a result is obtained in every readout attempt. The fidelity proves robust against atomic frequency shifts induced by the trapping potential. Our scheme does not require strong coupling between the atom and cavity and can be generalized to other systems with an optically accessible quantum bit.
Dieter Jaksch - One of the best experts on this subject based on the ideXlab platform.
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entangling strings of Neutral Atoms in 1d atomic pipeline structures
Physical Review Letters, 2003Co-Authors: U Dorner, Dieter Jaksch, P O Fedichev, Maciej Lewenstein, P ZollerAbstract:We study a string of Neutral Atoms with nearest neighbor interaction in a 1D beam splitter configuration, where the longitudinal motion is controlled by a moving optical lattice potential. The dynamics of the Atoms crossing the beam splitter maps to a 1D spin model with controllable time dependent parameters, which allows the creation of maximally entangled states of Atoms by crossing a quantum phase transition. Furthermore, we show that this system realizes protected quantum memory, and we discuss the implementation of one- and two-qubit gates in this setup.
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fast quantum gates for Neutral Atoms
Physical Review Letters, 2000Co-Authors: Dieter Jaksch, J. Ignacio Cirac, Peter Zoller, S L Rolston, Robin Cote, Mikhail D LukinAbstract:We propose several schemes for implementing a fast two-qubit quantum gate for Neutral Atoms with the gate operation time much faster than the time scales associated with the external motion of the Atoms in the trapping potential. In our example, the large interaction energy required to perform fast gate operations is provided by the dipole-dipole interaction of Atoms excited to low-lying Rydberg states in constant electric fields. A detailed analysis of imperfections of the gate operation is given.
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Quantum computing with Neutral Atoms
Journal of Modern Optics, 2000Co-Authors: Hans J Briegel, Dieter Jaksch, J. Ignacio Cirac, Tommaso Calarco, Peter ZollerAbstract:We develop a method to entangle Neutral Atoms using cold controlled collisions. We analyze this method in two particular set-ups: optical lattices and magnetic micro-traps. Both offer the possibility of performing certain multi-particle operations in parallel. Using this fact, we show how to implement efficient quantum error correction and schemes for fault-tolerant computing.
