1,594 research outputs found
Comment on "Quantum Teleportation of Eight-Qubit State via Six-Qubit Cluster State"
Recently, Zhao et al., (Int. J. Theor. Phys. 57, 516-522 (2018)) have
proposed a scheme for quantum teleportation of an eight-qubit quantum state
using a six qubit cluster state. In this comment, it's shown that the quantum
resource (multi-partite entangled state used as the quantum channel) used by
Zhao et al., is excessively high and the task can be performed using any two
Bell states as the task can be reduced to the teleportation of an arbitrary two
qubit state. Further, a trivial conceptual mistake made by Zhao et al., in the
description of the quantum channel has been pointed out. It's also mentioned
that recently a trend of proposing teleportation schemes with excessively high
quantum resources has been observed and the essence of this comment is
applicable to all such proposals.Comment: It is shown that teleportation of multi qubit-states can be done
using Bell state
Complete characterization of the directly implementable quantum gates used in the IBM quantum processors
Quantum process tomography of each directly implementable quantum gate used
in the IBM quantum processors is performed to compute gate error in order to
check viability of complex quantum operations in the superconductivity-based
quantum computers introduced by IBM and to compare the quality of these gates
with the corresponding gates implemented using other technologies. Quantum
process tomography (QPT) of C-NOT gates have been performed for three
configurations available in IBM QX4 processor. For all the other allowed gates
QPT have been performed for every allowed position (i.e., by placing the gates
in different qubit lines) for IBM QX4 architecture, and thus, gate fidelities
are obtained for both single-qubit and 2-qubit gates. Gate fidelities are
observed to be lower than the corresponding values obtained in the other
technologies, like NMR. Further, gate fidelities for all the single-qubit gates
are obtained for IBM QX2 architecture by placing the gates in the third qubit
line (). It's observed that the IBM QX4 architecture yields better gate
fidelity compared to IBM QX2 in all cases except the case of
gate as far as the gate fidelity corresponding to the third qubit line is
concerned. In general, the analysis performed here leads to a conclusion that a
considerable technological improvement would be inevitable to achieve the
desired scalability required for the realization of complex quantum operations.Comment: Quantum Process tomography has been done for all the gates used in
IBM QX2 and IBM QX
Design and experimental realization of an optimal scheme for teleportion of an -qubit quantum state
An explicit scheme (quantum circuit) is designed for the teleportation of an
-qubit quantum state. It is established that the proposed scheme requires an
optimal amount of quantum resources, whereas larger amount of quantum resources
has been used in a large number of recently reported teleportation schemes for
the quantum states which can be viewed as special cases of the general
-qubit state considered here. A trade off between our knowledge about the
quantum state to be teleported and the amount of quantum resources required for
the same is observed. A proof of principle experimental realization of the
proposed scheme (for a 2-qubit state) is also performed using 5-qubit
superconductivity-based IBM quantum computer. Experimental results show that
the state has been teleported with high fidelity. Relevance of the proposed
teleportation scheme has also been discussed in the context of controlled,
bidirectional, and bidirectional-controlled state teleportation.Comment: 11 pages 4 figure
Accuracy of visual inspection with acetic acid for cervical pathology screening in low cost setup
Background: Cancer cervix, a preventable disease continues to be a cause of great concern to women’s health, being associated with agonizing morbidity and high mortality. Approximately 493,100 new cases and more than 273,000 deaths occur each year, among women worldwide.IN India the screening is largely based on pap smear, which is cumbersome procedure due to transportation of samples and follow up of patients are not usually feasible. Visual inspection with Acetic acid (VIA) is simple and easy to teach procedure. Follow-up of patients usually doesn’t require.Methods: This study includes a total of 1000 patients who attended OPD of gynecology. Each patient is subjected to VIA examination. Biopsy is taken from women with abnormal findings on VIA. The objectives of this study were to evaluate the sensitivity and specificity and positive predictive value of inspection of cervix with acetic acid in precancerous lesions of cervix.Results: When biopsy is taken as reference standard, VIA has sensitivity of 97.7%, specificity of 76.6%, PPV of 62.9% and NPV of 98.5%. The accuracy rate for VIA is 84.8%.Conclusions: VIA is highly sensitive for diagnosis and treatment of cervical pathology at the same sitting. It can be done cost effectively in low resource set up
Estimation of extracellular lipase enzyme produced by thermophilic bacillus sp. isolated from arid and semi-arid region of Rajasthan, India
Thermophilic organisms can be defined as microorganisms which are adapted to live at high temperatures. The enzymes produce by thermophilic bacteria are capable of catalyzing biochemical reactions at high temperatures. Thermophilic bacteria are able to produce thermostable lipase enzymes capable of degradation of lipid at temperatures higher than those of mesophilic bacteria. Therefore, the isolation of thermophilic bacteria from natural sources and their identification are quite useful in terms of discovering thermophilic lipase enzymes. Due to great temperature fluctuation in hot arid and semi-arid regions of Rajasthan, this area could serve as a good source for new thermophilic lipase producing bacteria with novel industrially important properties. The main objective of this research is the isolation and estimation of industrially important thermophilic lipase enzyme produced by thermophilic bacteria, isolated from arid and semi-arid region of Rajasthan. For this research purpose, soil samples were collected from Churu, Sikar and Jhunjunu regions of Rajasthan. A total of 16 bacterial strains were isolated, and among these bacterial isolates only two thermophilic lipase producing bacteria were identified. The thermophilic lipase enzyme was estimated by qualitative and quantitative experiments. The isolate was identified as Bacillus sp. by microscopic, biochemical and molecular characterization. The optimum enzyme activity was observed at pH 8, temperature 60°C and 5% salt concentration at 24 hrs time duration. Lipases are useful in a variety of biotechnological fields such as food and dairy (cheese ripening, flavour development), detergent, pharmaceutical (naproxen, ibuprofen), agrochemical (insecticide, pesticide) and oleochemical (fat and oil hydrolysis, biosurfactant synthesis) industries. Lipases can be further used in many newer areas where they can serve as potential biocatalysts. 

Augmented Session Similarity Based Framework for Measuring Web User Concern from Web Server Logs
In this paper, an augmented sessions similarity based framework is proposed to measure web user concern from web server logs. This proposed framework will consider the best usage similarity between two web sessions based on accessed page relevance and URL based syntactic structure of website within the session. The proposed framework is implemented using K-medoids clustering algorithms with independent and combined similarity measures. The clusters qualities are evaluated by measuring average intra-cluster and inter-cluster distances. The experimental results show that combined augmented session dissimilarity metric outperformed the independent augmented session dissimilarity measures in terms of cluster validity measures
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