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Miranowicz A.,Adam Mickiewicz University | Miranowicz A.,RIKEN | Paprzycka M.,Adam Mickiewicz University | Pathak A.,JIIT | And 3 more authors.
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2014

Conventional Glauber coherent states (CS) can be defined in several equivalent ways, e.g., by displacing the vacuum or, explicitly, by their infinite Poissonian expansion in Fock states. It is well known that these definitions become inequivalent if applied to finite d-level systems (qudits). We present a comparative Wigner-function description of the qudit CS defined (i) by the action of the truncated displacement operator on the vacuum and (ii) by the Poissonian expansion in Fock states of the Glauber CS truncated at (d-1)-photon Fock state. These states can be generated from a classical light by its optical truncation using nonlinear and linear quantum scissors devices, respectively. We show a surprising effect that a macroscopically distinguishable superposition of two qudit CS (according to both definitions) can be generated with high fidelity by displacing the vacuum in the qudit Hilbert space. If the qudit dimension d is even (odd), then the superposition state contains Fock states with only odd (even) photon numbers, which can be referred to as the odd (even) qudit CS or Schrödinger's cat state. This phenomenon can be interpreted as an interference of a single CS with its reflection from the highest-energy Fock state of the Hilbert space, as clearly seen via phase-space interference of the Wigner function. We also analyze nonclassical properties of the qudit CS including their photon-number statistics and nonclassical volume of the Wigner function, which is a quantitative parameter of nonclassicality (quantumness) of states. Finally, we study optical tomograms, which can be directly measured in the homodyne detection of the analyzed qudit cat states and enable the complete reconstructions of their Wigner functions. © 2014 American Physical Society. Source

Chattopadhyay A.,Indian School of Mines | Gupta S.,Indian School of Mines | Kumari P.,JIIT | Sharma V.K.,Defence Science and Technology Organisation, Australia
Acta Geophysica | Year: 2012

The present paper is concerned with the propagation of shear waves in a homogeneous viscoelastic isotropic layer lying over a semi-infinite heterogeneous viscoelastic isotropic half-space due to point source. The inhomogeneity parameters associated to rigidity, internal friction and density are assumed to be functions of depth. The dispersion equation of shear waves has been obtained using Green's function technique. The dimensionless angular frequency has been plotted against dimensionless wave number for different values of inhomogeneity parameters. The effects of inhomogeneity have been shown in the dispersion curves. graphical user interface (GUI) software in MATLAB has been developed to show the effect of various inhomogeneity parameters on angular frequency. The topic can be of interest for geophysical applications in propagation of shear waves on the Earth's crust. © 2011 Institute of Geophysics, Polish Academy of Sciences. Source

Kumar M.,JIIT
2013 International Conference on Signal Processing and Communication, ICSC 2013 | Year: 2013

A square/triangular wave generator using fractional capacitor is proposed in the paper. Proposed circuit realization improves the oscillation frequency. The circuit is simulated with PSPICE and realized using active components. The simulated result matches with practical result. © 2013 IEEE. Source

Shukla D.S.,SRMU | Pandey A.C.,JIIT | Kulhari A.,JIIT
Proceedings of the International Conference on Innovative Applications of Computational Intelligence on Power, Energy and Controls with Their Impact on Humanity, CIPECH 2014 | Year: 2014

In the recent few years, many wireless sensor networks have been distributed systematically in the real world to collect valuable raw sensed data. However, the crucial point of challenge is to extract high level knowledge from this raw sensed data. In the application of data analysis, a necessary preprocessing step is anomaly detection, also known as deviation detection or data cleansing. Outliers in wireless sensor networks (WSNs) are those measures that deviate from a defined pattern. Outlier detection can be used to remove noisy data, detect faulty nodes and discover interesting events. Numerous small and low cost nodes loaded with capabilities of integrated sensing and computation are involved in a WSN structure. Due to high density WSNs are exposed to faults and nasty attacks causing inaccurate and unreliable sensors reading, making Wireless sensor networks prone to outliers. This survey provides an outline of outlier detection techniques and approaches focusing on event and error based outliers. © 2014 IEEE. Source

Joshi M.,JIIT | Sardana N.,JIIT
2014 International Conference on Computing for Sustainable Global Development, INDIACom 2014 | Year: 2014

In last few decades object oriented software design approach is widely chosen by programmers to design any large and complex system. As the complexity of object oriented software increases, design for testability becomes a necessary task for these systems. The performance of testability is also directly affected by software design for testability. Therefore to make the task of testability more effective, smooth, and reliable, we need the concept of design for testability. Design for testability can be applied during the design time as well as code time but both have its own concerns. This paper discusses design for testability analysis to enhance the testability of object oriented systems. © 2014 IEEE. Source

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