464 research outputs found
One-step generation of high-quality squeezed and EPR states in cavity QED
We show how to generate bilinear (quadratic) Hamiltonians in cavity quantum
electrodynamics (QED) through the interaction of a single driven three-level
atom with two (one) cavity modes. With this scheme it is possible to generate
one-mode mesoscopic squeezed superpositions, two-mode entanglements, and
two-mode squeezed vacuum states (such the original EPR state), without the need
for Ramsey zones and external parametric amplification. The degree of squeezing
achieved is up to 99% with currently feasible experimental parameters and the
errors due to dissipative mechanisms become practically negligible
Coulomb parameters and photoemission for the molecular metal TTF-TCNQ
We employ density-functional theory to calculate realistic parameters for an
extended Hubbard model of the molecular metal TTF-TCNQ. Considering both intra-
and intermolecular screening in the crystal, we find significant longer-range
Coulomb interactions along the molecular stacks, as well as inter-stack
coupling. We show that the long-range Coulomb term of the extended Hubbard
model leads to a broadening of the spectral density, likely resolving the
problems with the interpretation of photoemission experiments using a simple
Hubbard model only.Comment: 4 pages, 2 figure
A retrospective observational study investigating the factors associated with right heart failure in patients with primary acute pulmonary embolism and deep vein thrombosis
鈴鹿医療科学大学博士(医療科学)application/pdfdoctoral thesi
New gauge bosons from the littlest Higgs model and the process
In the context of the littlest Higgs model, we study the process . We find that the new gauge bosons and
can produce significant correction effects on this process, which can be
further enhanced by the suitably polarized beams. In most of the parameter
space preferred by the electroweak precision data, the absolute value of the
relative correction parameter is larger than 5%. As long as
and the absolute value of
the relative correction parameter is larger than 5%. With
reasonable values of the parameters of the model, the possible signals of
the new gauge bosons and can be detected via the process in the future experiments with the c.m. energy
. exchange and exchange can generate
significantly corrections to the forward-backward asymmetry
only in small part of the parameter space.Comment: 18 pages, 6 figure
The Lorentz and CPT violating effects on the Z\to l^+ l^- decay
We study the Lorentz and CPT violating effects on the branching ratio BR, the
CPT violating asymmetry A_{CPT} and the ratio of the decay width, including
only the Lorentz violating effects, to the one obtained in the standard model,
for the flavor dependent part of the lepton flavor conserving Z\to l^+ l^-
(l=e,\mu,\tau) decay. The inclusion of the Lorentz and CPT violating effects to
the standard model contribution is too small to be detected, since the
corresponding coefficients are highly suppressed at the low energy scale.Comment: 11 pages, 6 figure
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