Derniers dépôts, tout type de documents

We analyze the Google matrix of directed networks of Wikipedia articles related to eight recent Wikipedia language editions representing different cultures (English, Arabic, German, Spanish, French, Italian, Russian, Chinese). Using the reduced Google matrix algorithm, we determine relations and interactions of 23 society concepts and 17 religions represented by their respective articles for each of the eight editions. The effective Markov transitions are found to be more intense inside the two blocks of society concepts and religions while transitions between the blocks are significantly reduced. We establish five poles of influence for society concepts (Law, Society, Communism, Liberalism, Capitalism) as well as five poles for religions (Christianity, Islam, Buddhism, Hinduism, Chinese folk religion) and determine how they affect other entries. We compute inter-edition correlations for different key quantities providing a quantitative analysis of the differences or the proximity of views of the eight cultures with respect to the selected society concepts and religions.

Continuer la lecture Partager

Quantum cloning is a fundamental protocol of quantum information theory. Perfect universal quantum cloning is prohibited by the laws of quantum mechanics, only imperfect copies being reachable. Symmetric quantum cloning is concerned with case when the quality of the clones is identical. In this work, we study the general case of $1 \to N$ asymmetric cloning, where one asks for arbitrary qualities of the clones. We characterize, for all Hilbert space dimensions and number of clones, the set of all possible clone qualities. This set is realized as the nonnegative part of the unit ball of a newly introduced norm, which we call the $\mathcal{Q}$-norm. We also provide a closed form expression for the quantum cloner achieving a given clone quality vector. Our analysis relies on the Schur-Weyl duality and on the study of the spectral properties of partially transposed permutation operators.

Continuer la lecture Partager

In the quest for robust and universal quantum devices, the notion of simulation plays a crucial role, both from a theoretical and from an applied perspective. In this work, we go beyond the simulation of quantum channels and quantum measurements, studying what it means to simulate a collection of measurements, which we call a multimeter. To this end, we first explicitly characterize the completely positive transformations between multimeters. However, not all of these transformations correspond to valid simulations, as evidenced by the existence of maps that always prepare the same multimeter regardless of the input, which we call trash-and-prepare. We give a new definition of multimeter simulations as transformations that are triviality-preserving, i.e., when given a multimeter consisting of trivial measurements they can only produce another trivial multimeter. In the absence of a quantum ancilla, we then characterize the transformations that are triviality-preserving and the transformations that are trash-and-prepare. Finally, we use these characterizations to compare our new definition of multimeter simulation to three existing ones: classical simulations, compression of multimeters, and compatibility-preserving simulations.

Continuer la lecture Partager

We introduce the Ising Network Opinion Formation (INOF) model and apply it for the analysis of networks of 6 Wikipedia language editions. In the model, Ising spins are placed at network nodes/articles and the steady-state opinion polarization of spins is determined from the Monte Carlo iterations in which a given spin orientation is determined by in-going links from other spins. The main consideration is done for opinion confrontation between {\it capitalism, imperialism} (blue opinion) and {\it socialism, communism} (red opinion). These nodes have fixed spin/opinion orientation while other nodes achieve their steady-state opinions in the process of Monte Carlo iterations. We find that the global network opinion favors {\it socialism, communism} for all 6 editions. The model also determines the opinion preferences for world countries and political leaders, showing good agreement with heuristic expectations. We also present results for opinion competition between {\it Christianity} and {\it Islam}, and USA Democratic and Republican parties. We argue that the INOF approach can find numerous applications for directed complex networks.

Continuer la lecture Partager

Sujets

Quantum chaos Wikipedia Unfolding Chaos quantique Semiclassical Disordered Systems and Neural Networks cond-matdis-nn Spin Unitarity Clonage FOS Physical sciences Quantum denoiser Duality Aubry transition Dark matter Decoherence Adaptative denoiser Quantum many-body interaction 2DEAG Anderson localization CheiRank algorithm PageRank algorithm Correlation Structure Harper model Hilbert space Adaptive filters Quantum denoising Random graphs Community structure Amplification Opinion formation Qubit World trade network Quantum Physics quant-ph Dynamical chaos Interférence Deep learning 2DEG Wikipedia networks Quantum computation PageRank Poincare recurrences Denoising Semi-classique 2DRank algorithm 6470qj 7215Rn Complex networks Model Atom laser Ordinateur quantique Solar System World trade Entanglement Numerical calculations International trade Toy model Random Nonlinearity Adaptive transformation Networks 0545Mt Chaotic systems 2DRank Mécanique quantique Many-body problem CheiRank Social networks Statistical description Adaptive transform Husimi function Information theory Random matrix theory Localization Calcul quantique Chaotic dynamics Matrix model Super-Resolution Wikipedia network Plug-and-Play ANDREAS BLUHM Critical phenomena Information quantique ADMM Algebra Covariance Adaptive signal and image representation Quantum mechanics Quantum image processing Chaos 0375-b Entropy Wigner crystal Fidelity Google matrix Directed networks Cloning Markov chains Asymmetry Quantum information

Statistiques

Nombre de fichiers déposés

90

Nombre de notices déposées

319