Entanglement generation in spatially separated systems using quantum walk

We present a novel scheme to generate entanglement between two spatially separated systems. The scheme makes use of spatial entanglement generated by a single-particle quantum walk which is used to entangle two spatially separated, not necessarily correlated, systems. This scheme can be used to entangle any two systems which can interact with the spatial modes entangled during the quantum walk evolution. A notable feature is that we can control the quantum walk dynamics and its ability to localize leads to a substantial control and improvement in the entanglement output.Comment: 9 pages, 5 figure

PHYTOCHEMICAL EVALUATION AND IN VITRO ANTIMICROBIAL AND ANTIOXIDANT STUDIES OF LEAF AND STEM BARK EXTRACTS OF POLYALTHIA FRAGRANS (DALZ.) BEDD.–AN ENDEMIC SPECIES OF WESTERN GHATS

Objective: Phytochemical constituents of various solvent extracts of leaf and stem bark of Polyalthia fragrans (Dalz.) Bedd were screened. Antimicrobial and antioxidant activities of the extracts were evaluated.Methods: Crude extracts of methanol, ethyl acetate, chloroform and aqueous of leaf and stem bark were evaluated for antimicrobial activity by disc diffusion method and antioxidant activity by DPPH (diphenyl-2-picrylhydrazyl) radical scavenging and reducing power assay. Quantitative analysis of total phenolics was done by the Folin-Ciocalteau method and total flavonoids by aluminum chloride method.Results: The study revealed the presence of several physiologically active phytochemicals such as alkaloids, phenols, flavonoids and tannins. The highest antibacterial activity of methanol extract of the leaf was observed against Bacillus subtilis with 14.33±0.57 mm inhibition zone and water extract of stem bark against Proteus vulgaris with 17.67±1.52 mm inhibition zone among other extracts. The lowest activity of leaf methanol and leaf water extract was observed against Bacillus subtilis. The IC50 values of 58.18±2.04 µg/ml, 116.58±2.43 µg/ml, 134.78±3.64 µg/ml and 387.28±2.9 µg/ml for DPPH activity were observed in methanol stem bark, ethyl acetate stem bark, methanol leaf and ethyl acetate leaf extracts respectively. The reducing power of extracts was very potent which increased with increasing concentrations of the sample.Conclusion: The results indicate that phytochemicals like alkaloids, phenols, flavonoids and tannins may be responsible for the antimicrobial and antioxidant properties. The results suggest that P. fragrans can be further researched to be used as a natural source of a potent drug by mankind

Enhancement of Geometric Phase by Frustration of Decoherence: A Parrondo like Effect

Geometric phase plays an important role in evolution of pure or mixed quantum states. However, when a system undergoes decoherence the development of geometric phase may be inhibited. Here, we show that when a quantum system interacts with two competing environments there can be enhancement of geometric phase. This effect is akin to Parrondo like effect on the geometric phase which results from quantum frustration of decoherence. Our result suggests that the mechanism of two competing decoherence can be useful in fault-tolerant holonomic quantum computation.Comment: 5 pages, 3 figures, Published versio

In vitro pharmacological potential of Epiprinus mallotiformis – An endemic species of Western Ghats

Epiprinus mallotiformis is an endemic species of Western Ghats, traditionally known to cure dysentery, digestive problems, ulcers, gonorrhoea and also as a good antimicrobial and diuretic agent. The present investigation was done to evaluate the in vitro pharmacological activities and preliminary screening for phytochemicals in leaf, stem and bark extracts. The study revealed an optimum antioxidant, anti-inflammatory and antimicrobial activities and the presence of phenolics, flavonoids and saponins in the plant extracts. The ethyl acetate fraction of leaf samples exhibited a very significant antibacterial activity against S. aureus with a minimum bactericidal concentration of 8 mg/mL which might be due to the presence of high saponin content (9 %) in the leaves. The investigation also suggests the possible use of E. mallotiformis as an antioxidant, anti-inflammatory and antibacterial agent

Optical and magnetic resonance studies of the interaction of metallo tetraphenylporphyrins with nitrobenzofuroxan

Metallo tetraphenylporphyrins form 1:1 molecular complexes with 4,6-dinitrobenzofuroxan. The molecular association is described in terms of π-π interaction with porphyrins functioning as donors. The association constants and thermodynamic parameters have been evaluated using optical absorption and 1H nmr spectral methods. Based on the binding constants, the donor ability of various metalloporphyrins can be arranged in the following order: Pd(II) > Co(II) > Cu(II) > Ni(II) ˜ VO(IV) ˜ 2H > Zn(II). Electron paramagnetic resonance studies of the complexes reveal that the π-complexation results in changes in the electronic structure of the central metal ions which are reflected in the changes in the M-N σ bonding. The dipolar contribution to the acceptor proton chemical shifts in the CoTPP complex has been partitioned from ring current contributions using the shifts observed in the ZnTPP complex. The shifts, along with the line broadening ratios observed for the CoTPP complex, are used to arrive at the possible solution structures of the complexes

Expanded porphyrins as third order non-linear optical materials: some structure-function correlations

In this paper, the non-linear optical properties of representative core-modified expanded porphyrins have been investigated with an emphasis on the structure-property relationship between the aromaticity and conformational behaviour. It has been shown that the measured two-photon absorption cross section (σ2) values depend on the structure of macrocycle, its aromaticity and the number of π-electrons in conjugation

Knowledge and use of electronic information resources by Post graduate Engineering students of Karnataka state: A study

The present study is an attempt to know the knowledge and use of electronic information resources by post graduate engineering students studying in 16 Autonomous engineering colleges of Karnataka state. The study involved 1064 post graduate engineering students and found that 100% students use electronic information resources. The study also revealed that e-journals are the most preferred e-resources and the library notice board along with library websites are the major sources of creating awareness about the availability of e-resources. However, the trial and error method was highly used to use e-resources followed by self-study and library orientation. The study found that keyword search is highly preferred and the VTU consortium is a highly preferred gateway for accessing the e-resources. Engineering students lack the skill of selecting the right search term. Apart from this slow internet connectivity also hinders the effective use of e-resources