24 research outputs found
Quantum Diagonalization Method in the Tavis-Cummings Model
To obtain the explicit form of evolution operator in the Tavis-Cummings model
we must calculate the term explicitly which is very hard. In this paper we try to make the
quantum matrix diagonal to
calculate and, moreover, to know a deep structure of the model.
For the case of one, two and three atoms we give such a diagonalization which
is first nontrivial examples as far as we know, and reproduce the calculations
of given in quant-ph/0404034. We also give a hint to an
application to a noncommutative differential geometry.
However, a quantum diagonalization is not unique and is affected by some
ambiguity arising from the noncommutativity of operators in quantum physics.
Our method may open a new point of view in Mathematical Physics or Quantum
Physics.Comment: Latex files, 21 pages; minor changes. To appear in International
Journal of Geometric Methods in Modern Physic
Methylprednisolone pulse therapy and intravenous cyclophosphamide therapy combined with cocktail therapy in severe pediatric Henoch-Schönlein purpura nephritis patient
Early Treatment with Methylprednisolone Pulse Therapy Combined with Tonsillectomy for Heavy Proteinuric Henoch-Schönlein Purpura Nephritis in Children
Background: There is no clear consensus as to which patients with Henoch-Schönlein purpura nephritis (HSPN) at risk of a poor outcome should be treated and what therapeutic regimen should be used. Methods: Nine children with heavy proteinuric HSPN received prompt initiation of methylprednisolone pulse therapy (MPT) combined with tonsillectomy in a prospective study. Results: At presentation, the mean values for the patientsâ urine protein excretion (early-morning urinary protein/creatinine ratio), serum IgA, activity index (AI), and chronicity index (CI) were 5.0 ± 5.6 g/g Cr, 135.6 ± 56.5 mg/dl, 4.0 ± 0.7, and 1.7 ± 1.3, respectively. At the second biopsy, conducted approximately 24 months after initiation of therapy, the patientsâ serum albumin had significantly increased (4.4 ± 0.2, p Conclusions: Early treatment with MPT combined with tonsillectomy is effective in ameliorating the histopathological progression and improving the clinical course of children with heavy proteinuric HSPN
Explicit Form of the Evolution Operator of Tavis-Cummings Model : Three and Four Atoms Cases
In this letter the explicit form of evolution operator of the Tavis-Cummings
model with three and four atoms is given. This is an important progress in
quantum optics or mathematical physics.Comment: Latex file, 10 pages. We combined quant-ph/0404034(the three atoms
case) and quant-ph/0406184(the four atoms case) into an article. to appear in
International Journal of Geometric Methods in Modern Physic
Cavity QED and Quantum Computation in the Weak Coupling Regime
In this paper we consider a model of quantum computation based on n atoms of
laser-cooled and trapped linearly in a cavity and realize it as the n atoms
Tavis-Cummings Hamiltonian interacting with n external (laser) fields.
We solve the Schr{\" o}dinger equation of the model in the case of n=2 and
construct the controlled NOT gate by making use of a resonance condition and
rotating wave approximation associated to it. Our method is not heuristic but
completely mathematical, and the significant feature is a consistent use of
Rabi oscillations.
We also present an idea of the construction of three controlled NOT gates in
the case of n=3 which gives the controlled-controlled NOT gate.Comment: Latex file, 22 pages, revised version. To appear in Journal of Optics
B : Quantum and Semiclassical Optic