429 research outputs found
Motion Tomography of a single trapped ion
A method for the experimental reconstruction of the quantum state of motion
for a single trapped ion is proposed. It is based on the measurement of the
ground state population of the trap after a sudden change of the trapping
potential. In particular, we show how the Q function and the quadrature
distribution can be measured directly. In an example we demonstrate the
principle and analyze the sensibility of the reconstruction process to
experimental uncertainties as well as to finite grid limitations. Our method is
not restricted to the Lamb-Dicke Limit and works in one or more dimensions.Comment: 4 pages, Revtex format, 4 postscript figures, changed typographical
error
Quantum gates with "hot" trapped ions
We propose a scheme to perform a fundamental two-qubit gate between two
trapped ions using ideas from atom interferometry. As opposed to the scheme
considered by J. I. Cirac and P. Zoller, Phys. Rev. Lett. 74, 4091 (1995), it
does not require laser cooling to the motional ground state.Comment: 4 pages, 2 eps figure
Reconstruction of Liouvillian Superoperators
We show how to determine (reconstruct) a master equation governing the time
evolution of an open quantum system.
We present a general algorithm for the reconstruction of the corresponding
Liouvillian superoperators. Dynamics of a two-level atom in various
environments is discussed in detail.Comment: 4 pages, revtex, 1 eps figure, accepted for publication in Phys. Rev.
Complete Characterization of a Quantum Process: the Two-Bit Quantum Gate
We show how to fully characterize a quantum process in an open quantum
system. We particularize the procedure to the case of a universal two-qubit
gate in a quantum computer. We illustrate the method with a numerical
simulation of a quantum gate in the ion trap quantum computer.Comment: Accepted for publication in Physical Review Letters 08Nov96
(submitted 15Jly96
Decoherence and robustness of parity-dependent entanglement in the dynamics of a trapped ion
We study the entanglement between the 2D vibrational motion and two ground
state hyperfine levels of a trapped ion, Under particular conditions this
entanglement depends on the parity of the total initial vibrational quanta. We
study the robustness of this quantum coherence effect with respect to the
presence of non-dissipative sources of decoherence, and of an imperfect initial
state preparation.Comment: 13 pages, 5 figure
Quantum System Identification by Bayesian Analysis of Noisy Data: Beyond Hamiltonian Tomography
We consider how to characterize the dynamics of a quantum system from a
restricted set of initial states and measurements using Bayesian analysis.
Previous work has shown that Hamiltonian systems can be well estimated from
analysis of noisy data. Here we show how to generalize this approach to systems
with moderate dephasing in the eigenbasis of the Hamiltonian. We illustrate the
process for a range of three-level quantum systems. The results suggest that
the Bayesian estimation of the frequencies and dephasing rates is generally
highly accurate and the main source of errors are errors in the reconstructed
Hamiltonian basis.Comment: 6 pages, 3 figure
Reactivity of 2-acetylhydrazonemethyl-l -arylimidazole with reducing agents
La hidrogenación catalítica de los compuestos 1 origina mayoritariamente el producto resultante de la hidrogenolisis del enlace C=N y sólo se obtienen bajos rendimientos de las hidracidas 2 al utilizar Pd(C) como catalizador.
La reducción con AILiH4 de la rinde, para el estereoisómero Z, la hidracida 2a;
mientras que el estereoisómero E conduce por hidrogenolisis a los compuestos 4a y 5a.Catalytic hydrogenation of compounds 1 led mainly to the products resulting of the
hydrogenolysis of the bond C=N, while the hydrazides 2 were obtained in small yields
using Pd(C) as catalyst.
Reduction of la with AILiH. yielded the hydrazide 2a for the Z stereoisomer and
the products 4a and 5a for the E stereoisomer by hydrogenolysis
Measuring quantum optical Hamiltonians
We show how recent state-reconstruction techniques can be used to determine
the Hamiltonian of an optical device that evolves the quantum state of
radiation. A simple experimental setup is proposed for measuring the
Liouvillian of phase-insensitive devices. The feasibility of the method with
current technology is demonstrated on the basis of Monte Carlo simulated
experiments.Comment: Accepted for publication on Phys. Rev. Lett. 8 eps figures, 4
two-column pages in REVTE
Reactividad de 2-acetilhidrazonometil-1-arilimidazol frente a agentes reductores
Catalytic hydrogenation of compounds 1 led mainly to the products resulting of the hydrogenolysis of the bond C=N, while the hydrazides 2 were obtained in small yields using Pd(C) as catalyst. Reduction of la with AlLiH4 yielded the hydrazide 2a for the Z stereoisomer and the products 4a and 5a for the E stereoisomer by hydrogenolysis.La hidrogenación catalítica de los compuestos 1 origina mayoritariamente el producto resultante de la hidrogenolisis del enlace C=N y sólo se obtienen bajos rendimientos de las hidracidas 2 al utilizar Pd(C) como catalizador. La reducción con AlLiH4 de la rinde, para el estereoisómero Z, la hidracida 2a; mientras que el estereoisómero E conduce por hidrogenolisis a los compuestos 4a y 5a
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