Search results for "Statistica"

showing 10 items of 5969 documents

<I>A Special Issue on</I> Theoretical and Mathematical Aspects of Discrete Time Quantum Walks

2013

Computational MathematicsDiscrete time and continuous timeGeneral Materials ScienceQuantum walkGeneral ChemistryStatistical physicsElectrical and Electronic EngineeringCondensed Matter PhysicsMathematicsJournal of Computational and Theoretical Nanoscience
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A method for detecting vacancy diffusion in molecular dynamics

1992

Computational MathematicsNumerical AnalysisMolecular dynamicsMaterials sciencePhysics and Astronomy (miscellaneous)Chemical physicsApplied MathematicsModeling and SimulationVacancy defectStatistical physicsDiffusion (business)Computer Science ApplicationsJournal of Computational Physics
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Fermion sign problem in imaginary-time projection continuum quantum Monte Carlo with local interaction

2016

We use the Shadow Wave Function formalism as a convenient model to study the fermion sign problem affecting all projector Quantum Monte Carlo methods in continuum space. We demonstrate that the efficiency of imaginary time projection algorithms decays exponentially with increasing number of particles and/or imaginary-time propagation. Moreover, we derive an analytical expression that connects the localization of the system with the magnitude of the sign problem, illustrating this prediction through some numerical results. Finally, we discuss the fermion sign problem computational complexity and methods for alleviating its severity.

Computational complexity theoryQuantum Monte CarloFOS: Physical sciences02 engineering and technology01 natural scienceslaw.inventionCondensed Matter - Strongly Correlated ElectronslawPhysics - Chemical Physics0103 physical sciencesStatistical physics010306 general physicsWave functionProjection algorithmsChemical Physics (physics.chem-ph)Numerical sign problemPhysicsStrongly Correlated Electrons (cond-mat.str-el)FermionComputational Physics (physics.comp-ph)021001 nanoscience & nanotechnologyImaginary timeCondensed Matter - Other Condensed MatterClassical mechanicsProjector0210 nano-technologyPhysics - Computational PhysicsOther Condensed Matter (cond-mat.other)Physical Review E
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Attentional vs computational complexity measures in observing paintings

2009

Because of the great heterogeneity of subjects and styles, esthetic perception delineates a special and elusive field of research in vision, which represents an interesting challenge for cognitive science tools. With specific regard to the role of visual complexity, in this paper we present an experiment aimed to measure this dimension in a heterogeneous set of paintings. We compared perceived time complexity measures - based on a temporal estimation paradigm - with physical and statistical properties of the paintings, obtaining a strong correlation between psychological and computational results.

Computational complexity theoryVisionmedia_common.quotation_subjectMedicine in the ArtsVisual PhysiologyExperimental and Cognitive PsychologyField (computer science)PerceptionHumansAttentionDimension (data warehouse)Set (psychology)Time complexitymedia_commonSettore INF/01 - Informaticabusiness.industryDistance PerceptionComplexityForm PerceptionPattern Recognition VisualPattern recognition (psychology)PaintingsComputer Vision and Pattern RecognitionArtificial intelligenceFactor Analysis StatisticalPsychologybusinessPhotic StimulationCognitive psychology
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A Random Trajectory Approach for the Development of Nonstationary Channel Models Capturing Different Scales of Fading

2017

This paper introduces a new approach to developing stochastic nonstationary channel models, the randomness of which originates from a random trajectory of the mobile station (MS) rather than from the scattering area. The new approach is employed by utilizing a random trajectory model based on the primitives of Brownian fields (BFs), whereas the position of scatterers can be generated from an arbitrarily 2-D distribution function. The employed trajectory model generates random paths along which the MS travels from a given starting point to a fixed predefined destination point. To capture the path loss, the gain of each multipath component is modeled by a negative power law applied to the tra…

Computer Networks and CommunicationsComputer scienceAerospace Engineering020302 automobile design & engineering020206 networking & telecommunications02 engineering and technologysymbols.namesakeFading distribution0203 mechanical engineeringChannel state informationAutomotive Engineering0202 electrical engineering electronic engineering information engineeringElectronic engineeringTrajectorysymbolsPath lossFadingStatistical physicsElectrical and Electronic EngineeringPower delay profileGaussian processRandomnessComputer Science::Information Theory
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Robust entanglement preparation against noise by controlling spatial indistinguishability

2019

Initialization of composite quantum systems into highly entangled states is usually a must to allow their use for quantum technologies. However, the presence of unavoidable noise in the preparation stage makes the system state mixed, thus limiting the possibility of achieving this goal. Here we address this problem in the context of identical particle systems. We define the entanglement of formation for an arbitrary state of two identical qubits within the operational framework of spatially localized operations and classical communication (sLOCC). We then introduce an entropic measure of spatial indistinguishability under sLOCC as an information resource. We show that spatial indistinguisha…

Computer Networks and CommunicationsComputer scienceInitializationFOS: Physical sciencesContext (language use)Quantum entanglementNoise (electronics)Measure (mathematics)lcsh:QA75.5-76.95Settore FIS/03 - Fisica Della MateriaEntanglementComputer Science (miscellaneous)Statistical physicsQuantumQuantum PhysicsQuantum resourcesStatistical and Nonlinear PhysicsQuantum Physicslcsh:QC1-999Quantum technologyComputational Theory and MathematicsQubitOpen quantum systemlcsh:Electronic computers. Computer scienceQuantum Physics (quant-ph)lcsh:PhysicsQuantum indistinguishability
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Energy-efficient quantum computing

2016

In the near future, a major challenge in quantum computing is to scale up robust qubit prototypes to practical problem sizes and to implement comprehensive error correction for computational precision. Due to inevitable quantum uncertainties in resonant control pulses, increasing the precision of quantum gates comes with the expense of increased energy consumption. Consequently, the power dissipated in the vicinity of the processor in a well-working large-scale quantum computer seems unacceptably large in typical systems requiring low operation temperatures. Here, we introduce a method for qubit driving and show that it serves to decrease the single-qubit gate error without increasing the a…

Computer Networks and CommunicationsComputer scienceQC1-999FOS: Physical sciences01 natural sciences010305 fluids & plasmasEntanglementComputer Science::Emerging TechnologiesQuantum gateenergy consumption0103 physical sciencesComputer Science (miscellaneous)Electronic engineering010306 general physicsQuantumQuantum computerQuantum PhysicsPhysicskvanttitietokoneetStatistical and Nonlinear PhysicsenergiankulutusQA75.5-76.95Energy consumptionPower (physics)Computational Theory and MathematicsElectronic computers. Computer scienceQubitlämmön johtuminenQubitQuantum gatesQuantum Physics (quant-ph)Error detection and correctionEfficient energy use
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Perceptual adaptive insensitivity for support vector machine image coding.

2005

Support vector machine (SVM) learning has been recently proposed for image compression in the frequency domain using a constant epsilon-insensitivity zone by Robinson and Kecman. However, according to the statistical properties of natural images and the properties of human perception, a constant insensitivity makes sense in the spatial domain but it is certainly not a good option in a frequency domain. In fact, in their approach, they made a fixed low-pass assumption as the number of discrete cosine transform (DCT) coefficients to be used in the training was limited. This paper extends the work of Robinson and Kecman by proposing the use of adaptive insensitivity SVMs [2] for image coding u…

Computer Networks and CommunicationsImage processingPattern Recognition AutomatedArtificial IntelligenceDistortionImage Interpretation Computer-AssistedDiscrete cosine transformComputer SimulationMathematicsModels StatisticalArtificial neural networkbusiness.industryPattern recognitionSignal Processing Computer-AssistedGeneral MedicineData CompressionComputer Science ApplicationsSupport vector machineFrequency domainVisual PerceptionA priori and a posterioriArtificial intelligencebusinessSoftwareAlgorithmsImage compressionIEEE transactions on neural networks
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Acoustic spectral hole-burning in a two-level system ensemble

2020

AbstractMicroscopic two-level system (TLS) defects at dielectric surfaces and interfaces are among the dominant sources of loss in superconducting quantum circuits, and their properties have been extensively probed using superconducting resonators and qubits. We report on spectroscopy of TLSs coupling to the strain field in a surface acoustic wave (SAW) resonator. The narrow free spectral range of the resonator allows for two-tone spectroscopy where a strong pump is applied at one resonance, while a weak signal is used to probe a different mode. We map the spectral hole burnt by the pump tone as a function of frequency and extract parameters of the TLS ensemble. Our results suggest that det…

Computer Networks and CommunicationsQC1-999FOS: Physical sciences02 engineering and technologyDielectric01 natural sciencesMolecular physicsResonator0103 physical sciencesMesoscale and Nanoscale Physics (cond-mat.mes-hall)Computer Science (miscellaneous)Coherence (signal processing)010306 general physicsSpectroscopyPhysicsQuantum PhysicsCondensed Matter - Mesoscale and Nanoscale PhysicsPhysicsSurface acoustic waveResonanceStatistical and Nonlinear PhysicsQA75.5-76.95021001 nanoscience & nanotechnologyComputational Theory and MathematicsElectronic computers. Computer scienceSpectral hole burning0210 nano-technologyQuantum Physics (quant-ph)Free spectral range
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A Wideband MIMO Channel Model Derived From the Geometric Elliptical Scattering Model

2006

In this paper, we present a reference model for a wideband multiple-input multiple-output (MIMO) channel based on the geometric elliptical scattering model. The model takes into account the exact relationship between the angle of departure (AOD) and the angle of arrival (AOA). Based on this relationship, the statistical properties of the reference model are studied. Analytical solutions are presented for the three- dimensional (3D) space-time cross-correlation function (CCF), the temporal autocorrelation function (ACF), the 2D space CCF, and finally the frequency correlation function (FCF). The correlation properties are studied and visualized under the assumption of isotropic as well as no…

Computer Networks and CommunicationsScatteringComputer scienceAutocorrelationMathematical analysisMIMOCorrelation function (statistical mechanics)Channel capacityAngle of arrivalElectrical and Electronic EngineeringWidebandReference modelInformation SystemsComputer Science::Information Theory2006 3rd International Symposium on Wireless Communication Systems
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