17,705 research outputs found
A magnetogasdynamic power generation study third quarterly progress report
Calculations of preionized plasma flow with finite recombination rate - magnetohydrodynamic power generator stud
Interference of spin-orbit coupled Bose-Einstein condensates
Interference of atomic Bose-Einstein condensates, observed in free expansion
experiments, is a basic characteristic of their quantum nature. The ability to
produce synthetic spin-orbit coupling in Bose-Einstein condensates has recently
opened a new research field. Here we theoretically describe interference of two
noninteracting spin-orbit coupled Bose-Einstein condensates in an external
synthetic magnetic field. We demonstrate that the spin-orbit and the Zeeman
couplings strongly influence the interference pattern determined by the angle
between the spins of the condensates, as can be seen in time-of-flight
experiments. We show that a quantum backflow, being a subtle feature of the
interference, is, nevertheless, robust against the spin-orbit coupling and
applied synthetic magnetic field.Comment: published versio
Experimental recovery of a qubit from partial collapse
We describe and implement a method to restore the state of a single qubit, in
principle perfectly, after it has partially collapsed. The method resembles the
classical Hahn spin-echo, but works on a wider class of relaxation processes,
in which the quantum state partially leaves the computational Hilbert space. It
is not guaranteed to work every time, but successful outcomes are heralded. We
demonstrate using a single trapped ion better performance from this recovery
method than can be obtained employing projection and post-selection alone. The
demonstration features a novel qubit implementation that permits both partial
collapse and coherent manipulations with high fidelity.Comment: 5 pages, 3 figure
Optical properties, electron-phonon coupling, and Raman scattering of vanadium ladder compounds
The electronic structure of two V-based ladder compounds, the quarter-filled
NaVO in the symmetric phase and the iso-structural half-filled
CaVO is investigated by ab initio calculations. Based on the
bandstructure we determine the dielectric tensor of these
systems in a wide energy range. The frequencies and eigenvectors of the fully
symmetric A phonon modes and the corresponding electron-phonon and
spin-phonon coupling parameters are also calculated from first-principles. We
determine the Raman scattering intensities of the A phonon modes as a
function of polarization and frequency of the exciting light.
All results, i.e. shape and magnitude of the dielectric function, phonon
frequencies and Raman intensities show very good agreement with available
experimental data.Comment: 11 pages, 10 figure
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