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Search Results: 1 - 10 of 731 matches for " Manas Patra "
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Estimating Information Gain in Measurements in Suboptimal Bases for Quantum State Tomography
Manas Patra
Physics , 2006,
Abstract: It is known that mutually unbiased bases, whenever they exist, are optimal in an information theoretic sense for the determination of unknown state of a quantum ensemble. These bases may not exist in most dimensions and some suboptimal choices have to be made. The present paper deals with estimates of the information loss in suboptimal choice of bases. The information is calculated directly in terms of transition probabilities. I give estimates for the information content of measurement in some approximate MUBs proposed recently.
Projective invariant measures and approximation of quantum circuits
Manas Patra
Physics , 2006,
Abstract: In this paper we introduce a projective invarinat measure on the special unitary group. It is directly related to transition probabilities. It has some interesting connection with convex geometry. Applications to approximation of quantum circuits and entanglement are given.
An Algebraic Characterization of Security of Cryptographic Protocols
Manas K Patra,Yan Zhang
Computer Science , 2008,
Abstract: Several of the basic cryptographic constructs have associated algebraic structures. Formal models proposed by Dolev and Yao to study the (unconditional) security of public key protocols form a group. The security of some types of protocols can be neatly formulated in this algebraic setting. We investigate classes of two-party protocols. We then consider extension of the formal algebraic framework to private-key protocols. We also discuss concrete realization of the formal models. In this case, we propose a definition in terms of pseudo-free groups.
An Enterprise Cloud Model for Optimizing IT Infrastructure
Rabi Prasad Padhy,Manas Ranjan Patra
International Journal of Cloud Computing and Services Science (IJ-CLOSER) , 2012, DOI: 10.11591/closer.v1i3.777
Abstract: In cloud computing, end users are not required to buy software or devices as they are provided by service providers on a rental basis. Cloud Computing is the new IT platform as it promises dramatic reductions in cost and time-to-market due to pay-per-use and scalability. A large number of enterprises are shifting their computing from in-house infrastructure to the cloud infrastructure for optimize their infrastructure. The new-coming generation of employees and customers expect technological proficiency to be part of the customer-centered business models. On their turn, organizations need to apply new forms of cooperation with their employees, customers, suppliers and partners. As the enterprise business system surrounding Cloud Computing develops, it is critical to have a conception of how cloud services pulling, the diverse types of service offerings, and the way those services fit together. To overcome this problem we proposed a service selection layered method for cloud based enterprise. In this paper, we propose an approach to select or pull multiple cloud services from cloud market place for an Enterprise. Our approach provides best service selection process which will suit for an Enterprise’s requirement. This approach also improves governance for the service provider while offering maximum flexibility for the consumers. Our aim is to provide a better understanding of the cloud service selection challenges in a Enterprise cloud computing systems.
Architecture & Design of Affordable and Highly Available Enterprise Cloud Service
Rabi Prasad Padhy,Manas Ranjan Patra
International Journal of Cloud Computing and Services Science (IJ-CLOSER) , 2013, DOI: 10.11591/closer.v2i2.1527
Abstract: Cloud computing is a way to increase capacity or add capabilities on the fly without investing in additional infrastructure, licensing additional software or training new personnel. Enterprises must embrace this bleeding edge real-time business model in order to compete in the current marketplace. Deployment of enterprise applications in public cloud can reduce investment on IT infrastructure both in terms of hardware and software, whenever new services are to be provisioned. Furthermore, cloud services are quite attractive to business because of its dynamic scalability, privacy, performance and ability to handle heterogeneous environments. Instead of spending a lot of time in figuring out server setup and working on routers, it is judicious to subscribe cloud based 24/7 support and affordable services. It’s an extremely important consideration to subscribe to at least two cloud vendors for smooth running of applications and ensure application availability by switching from one provider to another with minimal management effort. In this article we have proposed an architecture and design of a cost affordable online enterprise cloud application that subscribes to two public cloud vendors with respect to cost and availability parameters. We also present the reasons for the current trend of enterprises moving towards 24/7 online business cloud services.
Automating WS-Agreement Monitoring
Ajaya Kumar Tripathy,Manas Ranjan Patra
International Journal of ACM Jordan , 2011,
Abstract: An SLA (Service Level Agreement) is an agreement between the web service provider and web service consumer that specifies a mutually agreed level of service quality, functional properties of a web service and business assumptions. WS-Agreement is a standard form of SLA for specifying agreement between service provider and service consumer. In WS-Agreement specification, the level of service quality, functional properties of a web service and business assumptions are termed as guarantee terms. Service provider and consumer need to be assured of the guarantee terms specified in the SLA at the time of service provisioning which can be done by SLA monitoring. A non-intrusive and service composition platform independent SLA monitoring is a real challenge. This paper proposes a protocol for specifying SLA guarantee terms using XML schema. Further, a non-intrusive and SBS composition platform independent monitoring framework has been proposed using a first order temporal logic based language called MSL, in order to ensure the WS-Agreement guarantee terms and monitor both functional and non-functional properties at run-time.
Evolution of Cloud Computing and Enabling Technologies
Rabi Prasad Padhy,Manas Ranjan Patra
International Journal of Cloud Computing and Services Science (IJ-CLOSER) , 2012, DOI: 10.11591/closer.v1i4.1216
Abstract: We present an overview of the history of forecasting software over the past 25 years, concentrating especially on the interaction between computing and technologies from mainframe computing to cloud computing. The cloud computing is latest one. For delivering the vision of various of computing models, this paper lightly explains the architecture, characteristics, advantages, applications and issues of various computing models like PC computing, internet computing etc and related technologies and also we summarized the current model cloud computing. Finally in this research paper, we described the need for convergence of competing IT paradigms to deliver our vision.
Quantum Fourier transform, Heisenberg groups and quasiprobability distributions
Manas K. Patra,Samuel L. Braunstein
Physics , 2010, DOI: 10.1088/1367-2630/13/6/063013
Abstract: This paper aims to explore the inherent connection among Heisenberg groups, quantum Fourier transform and (quasiprobability) distribution functions. Distribution functions for continuous and finite quantum systems are examined first as a semiclassical approach to quantum probability distribution. This leads to studying certain functionals of a pair of "conjugate" observables, connected via the quantum Fourier transform. The Heisenberg groups emerge naturally from this study and we take a rapid look at their representations. The quantum Fourier transform appears as the intertwining operator of two equivalent representation arising out of an automorphism of the group. Distribution functions correspond to certain distinguished sets in the group algebra. The marginal properties of a particular class of distribution functions (Wigner distributions) arise from a class of automorphisms of the group algebra of the Heisenberg group. We then study the reconstruction of Wigner function from the marginal distributions via inverse Radon transform giving explicit formulas. We consider applications of our approach to quantum information processing and quantum process tomography.
Consistent assignment of quantum probabilities
Manas K. Patra,Ron van der Meyden
Physics , 2011, DOI: 10.1088/1751-8113/45/7/075304
Abstract: We pose and solve a problem concerning consistent assignment of quantum probabilities to a set of bases associated with maximal projective measurements. We show that our solution is optimal. We also consider some consequences of the main theorem in the paper in conjunction with Gleason's theorem. Some potential applications to state tomography and probabilistic quantum secret-sharing scheme are discussed.
Decoherence-free quantum information in Markovian systems
Manas K. Patra,Peter G. Brooke
Physics , 2008, DOI: 10.1103/PhysRevA.78.010308
Abstract: Decoherence in Markovian systems can result indirectly from the action of a system Hamiltonian which is usually fixed and unavoidable. Here, we show that in general in Markovian systems, because of the system Hamiltonian, quantum information decoheres. We give conditions for the system Hamiltonian that must be satisfied if coherence is to be preserved. Finally, we show how to construct robust subspaces for quantum information processing.
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