Complete controllability of quantum systems

Sufficient conditions for complete controllability of $N$-level quantum systems subject to a single control pulse that addresses multiple allowed transitions concurrently are established. The results are applied in particular to Morse and harmonic-oscillator systems, as well as some systems with degenerate energy levels. Morse and harmonic oscillators serve as models for molecular bonds, and the standard control approach of using a sequence of frequency-selective pulses to address a single transition at a time is either not applicable or only of limited utility for such systems.Comment: 8 pages, expanded and revised versio

Near Field Lenses in Two Dimensions

It has been shown that a slab of materials with refractive index = -1 behaves like a perfect lens focussing all light to an exact electromagnetic copy of an object. The original lens is limited to producing images the same size as the object, but here we generalise the concept so that images can be magnified. For two dimensional systems, over distances much shorter than the free space wavelength, we apply conformal transformations to the original parallel sided slab generating a variety of new lenses. Although the new lenses are not `perfect' they are able to magnify two dimensional objects. The results apply equally to imaging of electric or magnetic sub wavelength objects in two dimensions. The concepts have potential applications ranging from microwave frequencies to the visible.Comment: PDF fil

Sub-wavelength imaging: Resolution enhancement using metal wire gratings

An experimental evidence of subwavelength imaging with a "lens", which is a uniaxial negative permittivity wire medium slab, is reported. The slab is formed by gratings of long thin parallel conducting cylinders. Taking into account the anisotropy and spatial dispersion in the wire medium we theoretically show that there are no usual plasmons that could be exited on surfaces of such a slab, and there is no resonant enhancement of evanescent fields in the slab. The experimentally observed clear improvement of the resolution in the presence of the slab is explained as filtering out the harmonics with small wavenumbers. In other words, the wire gratings (the wire medium) suppress strong traveling-mode components increasing the role of evanescent waves in the image formation. This effect can be used in near-field imaging and detection applications.Comment: 12 pages, 6 figure

Master’s of Science Programs in Information Systems: Match Between the Model Curriculum and Existing Programs

In a rapidly changing Information Systems (IS) field, the marketability of students from IS programs is partly related to the responsiveness of the programs to changing market conditions. Thus, curriculum development and periodic finetuning plays a very important role. This paper is an attempt to evaluate the current status of Master’s of Science programs in IS and to study their fit with the recently proposed MSIS 2000 model curriculum. We studied 86 Master’s of Science programs in IS and mapped them onto the proposed curriculum structure. Matches and mismatches with the proposed model curriculum are reported in our results. The results indicate the fit to be somewhat mixed. We have also presented some implications for university administrators and faculty for using the findings of this study and also for further curriculum research

MOLECULAR ANALYSIS OF STREPTOCOCCUS THERMOPHILUS SUPPORTING PROBIOTIC ACTION TOWARDS DRUG TARGETS

Streptococcus thermophilus is a Gram-positive facultative anaerobe with probiotic action. Nearly 2070 genes arepredicted in complete genome out of which 566 genes are related to hypothetical and uncharacterized genes. Thepredicted gene percent obtained by characterization of complete genome of S.thermophilus is 72.67% with 25functional categories. There is high number of transport, protein synthesis, binding and cell envelop proteins thatdon’t have pathogen responses. The genes ptsK, glgP, malQ, lacZ, amyL, scrB, etc are related to energy metabolism(with biodegradation and synthesis of polysaccharides) are found in chromosome CNRZ 1066. The genes such asglgP, malQ, lacZ and amyl had shown direct interactions that has not found direct link with scrB gene. All theproteins are observed with more the 50 percent identities that are present in homology models

Polarization effects in the total rate of biharmonic ω+3ω\omega + 3\omega ionization of atoms

Total ionization rate of biharmonic ($\omega + 3\omega$) ionization are studied within the independent particle approximation and third order perturbation theory. Particular attention is payed to how the polarization affects the total rate. The ratio of the biharmonic ionization is analyzed for linearly and circularly polarized beams as well as for co- and counterrotating elliptically polarized beams are analyzed and their dependence on beam parameters, such as the photon frequency or the phase between the $\omega$ and $3\omega$ light beams, is explained. We show that the interference of the biharmonic ionization amplitudes determines the dominance of a particular beam polarization over another and that it can be controlled by an appropriate choice of beam parameters. We demonstrate our findings for the ionization of neon $L$ shell electrons

Topological bands in two-dimensional networks of metamaterial elements

We show that topological frequency band structures emerge in two-dimensional electromagnetic lattices of metamaterial components without the application of an external magnetic field. The topological nature of the band structure manifests itself by the occurrence of exceptional points in the band structure or by the emergence of one-way guided modes. Based on an EM network with nearly flat frequency bands of nontrivial topology, we propose a coupled-cavity lattice made of superconducting transmission lines and cavity QED components which is described by the Janes-Cummings-Hubbard model and can serve as simulator of the fractional quantum Hall effect