323 research outputs found
Teleportation of Atomic States via Cavity Quantum Electrodynamics
In this article we discuss a scheme of teleportation of atomic states. The
experimental realization proposed makes use of cavity Quatum Electrodynamics
involving the interaction of Rydberg atoms with a micromaser cavity prepared in
a coherent state. We start presenting a scheme to prepare atomic Bell states
via the interaction of atoms with a cavity. In our scheme the cavity and some
atoms play the role of auxiliary systems used to achieve the teleportation.Comment: 12 pages and 2 figures. Accepted for publication in Opt. Comm.,
september (2004) issu
On the Complementarity Principle and the Uncertainty Principle
We present a scheme in which we investigate the two-slit experiment and we
show that the principle of complementarity is more fundamental then the
uncertainty principle.Comment: 6 page
Deceleration of continuous molecular beams
A method for decelerating a continuous beam of neutral polar molecules is
theoretically demonstrated. This method utilizes non-uniform, static electric
fields and regions of adiabatic population transfer to generate a mechanical
force that opposes the molecular beam's velocity. By coupling this technique
with dissipative trap-loading, molecular densities cm are
possible. When used in combination with forced evaporative cooling the proposed
method may represent a viable route to quantum degeneracy for a wide-class of
molecular species
Effects of Coulomb interactions on the splitting of luminescence lines
We study the splitting between the right-hand and left-hand circularly
polarized luminescence lines in a quantum dot under relatively weak confinement
regime and resonant high-power excitation. When the dot is populated with an
even number of electron-hole pairs (biexciton and higher excitations), the
splitting measures basically the Zeeman energy. However, in the odd number of
pairs case, we have, in addition to the Zeeman and Overhauser shifts, a
contribution to the splitting coming from Coulomb interactions. This
contribution is of the order of a few meV, and shows distinct signatures of
shell-filling in the quantum dot.Comment: Submitted for publicatio
Stability of E' centers induced by 4.7eV laser radiation in SiO2
The kinetics of E' centers (silicon dangling bonds) induced by 4.7eV pulsed
laser irradiation in dry fused silica was investigated by in situ optical
absorption spectroscopy. The stability of the defects, conditioned by reaction
with mobile hydrogen of radiolytic origin, is discussed and compared to results
of similar experiments performed on wet fused silica. A portion of E' and
hydrogen are most likely generated by laser-induced breaking of Si-H
precursors, while an additional fraction of the paramagnetic centers arise from
another formation mechanism. Both typologies of E' participate to the reaction
with H_2 leading to the post-irradiation decay of the defects. This annealing
process is slowed down on decreasing temperature and is frozen at T=200K,
consistently with the diffusion properties of H_2 in silica.Comment: 12 pages, 3 figures, in press on J. Non cryst. solids (2007
Electric dipole moment enhancement factor of thallium
The goal of this work is to resolve the present controversy in the value of
the EDM enhancement factor of Tl. We have carried out several calculations by
different high-precision methods, studied previously omitted corrections, as
well as tested our methodology on other parity conserving quantities. We find
the EDM enhancement factor of Tl to be equal to -573(20). This value is 20%
larger than the recently published result of Nataraj et al. [Phys. Rev. Lett.
106, 200403 (2011)], but agrees very well with several earlier results.Comment: 5 pages; v2: link to supplemental material adde
H(II) centers in natural silica under repeated UV laser irradiations
We investigated the kinetics of H(II) centers (=Ge'-H) in natural silica
under repeated 266nm UV irradiations performed by a Nd:YAG pulsed laser. UV
photons temporarily destroy these paramagnetic defects, their reduction being
complete within 250 pulses. After re-irradiation, H(II) centers grow again, and
the observed recovery kinetics depends on the irradiation dose; multiple 2000
pulses re-irradiations induce the same post-irradiation kinetics of H(II)
centers after each exposure cycle. The analysis of these effects allows us to
achieve a deeper understanding of the dynamics of the centers during and after
laser irradiation.Comment: Submitted to Journal of Non Crystalline Solid
О НЕОБХОДИМЫХ РЕФОРМАХ В ТОВАРНОМ ДВИЖЕНИИ
Archival publication from the journal «Railway Business», 1900.Архивная публикация из журнала «Железнодорожное дело», 1900 г. Железнодорожное дело. – 1900. – № 26. – С. 273–275. Из фондов библиотеки МИИТ
Predicting scattering properties of ultracold atoms: adiabatic accumulated phase method and mass scaling
Ultracold atoms are increasingly used for high precision experiments that can
be utilized to extract accurate scattering properties. This calls for a
stronger need to improve on the accuracy of interatomic potentials, and in
particular the usually rather inaccurate inner-range potentials. A boundary
condition for this inner range can be conveniently given via the accumulated
phase method. However, in this approach one should satisfy two conditions,
which are in principle conflicting, and the validity of these approximations
comes under stress when higher precision is required. We show that a better
compromise between the two is possible by allowing for an adiabatic change of
the hyperfine mixing of singlet and triplet states for interatomic distances
smaller than the separation radius. A mass scaling approach to relate
accumulated phase parameters in a combined analysis of isotopically related
atom pairs is described in detail and its accuracy is estimated, taking into
account both Born-Oppenheimer and WKB breakdown. We demonstrate how numbers of
singlet and triplet bound states follow from the mass scaling.Comment: 14 pages, 9 figure
Realization of GHZ States and the GHZ Test via Cavity QED
In this article we discuss the realization of atomic GHZ states involving
three-level atoms and we show explicitly how to use this state to perform the
GHZ test in which it is possible to decide between local realism theories and
quantum mechanics. The experimental realizations proposed makes use of the
interaction of Rydberg atoms with a cavity prepared in a coherent state.Comment: 16 pages and 3 figures. submitted to J. Mod. Op
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