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Garcia-March M.A.,Colorado School of Mines | Garcia-March M.A.,University College Cork | Garcia-March M.A.,Institute for Cross Disciplinary Physics and Complex Systems | De Castro M.M.,Institute for Cross Disciplinary Physics and Complex Systems | Zambrini R.,Institute for Cross Disciplinary Physics and Complex Systems
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2012

We show how to control spatial quantum correlations in a multimode, degenerate, type-I optical parametric oscillator below threshold by introducing a spatially inhomogeneous medium, such as a photonic crystal, in the plane perpendicular to light propagation. We obtain the analytical expressions for all of the correlations in terms of the relevant parameters of the problem and study the number of photons, entanglement, squeezing, and twin beams. Considering different regimes and configurations, we show that it is possible to tune the instability thresholds as well as the quantumness of correlations by breaking the translational invariance of the system through a photonic-crystal modulation. © 2012 American Physical Society.


de Castro M.M.,Institute for Cross Disciplinary Physics and Complex Systems | Gomila D.,Institute for Cross Disciplinary Physics and Complex Systems | Zambrini R.,Institute for Cross Disciplinary Physics and Complex Systems
European Physical Journal: Special Topics | Year: 2012

We study the effects of transverse spatial modulations in a multimode degenerate optical parametric oscillator. Intracavity photonic crystals allow us to tune the instability threshold and improve entanglement above threshold. Here we compare such results with the case in which the modulation is in the injected field profile. © 2012 EDP Sciences and Springer.


Cardillo A.,University of Zaragoza | Galve F.,Institute for Cross Disciplinary Physics and Complex Systems | Zueco D.,University of Zaragoza | Gomez-Gardenes J.,University of Zaragoza
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2013

We introduce the use of entanglement entropy as a tool for studying the amount of information shared between the nodes of quantum complex networks. By considering the ground state of a network of coupled quantum harmonic oscillators, we compute the information that each node has on the rest of the system. We show that the nodes storing the largest amount of information are not the ones with the highest connectivity, but those with intermediate connectivity, thus breaking down the usual hierarchical picture of classical networks. We show both numerically and analytically that the mutual information characterizes the network topology. As a by-product, our results point out that the amount of information available for an external node connecting to a quantum network allows one to determine the network topology. © 2013 American Physical Society.


Manzano G.,Institute for Cross Disciplinary Physics and Complex Systems | Zambrini R.,Institute for Cross Disciplinary Physics and Complex Systems
2011 5th Rio De La Plata Workshop on Laser Dynamics and Nonlinear Photonics, LDNP 2011 | Year: 2011

The emergence of mutual synchronization between oscillators, largely studied in classical systems, is explored in quantum systems. After reviewing recent research about the quantum aspects of this phenomenon, we present results obtained in the case of coupled harmonic oscillators with different natural frequencies. The presence of different dissipation processes, described by common or separate heat baths, plays a crucial role in the dynamical properties of the system. We show that mutual synchronization phenomena may appear only for a common bath. Furthermore we show that the emergence of synchronization is related to robust quantum correlations between the oscillators. Synchronization phenomena appear indeed in correspondence with large plateau where mutual information and quantum discord decay slowly, showing for the first time a quantum feature of spontaneous synchronization. © 2011 IEEE.


Rossi V.,Institute for Cross Disciplinary Physics and Complex Systems | Ser-Giacomi E.,Institute for Cross Disciplinary Physics and Complex Systems | Lopez C.,Institute for Cross Disciplinary Physics and Complex Systems | Hernandez-Garcia E.,Institute for Cross Disciplinary Physics and Complex Systems
Geophysical Research Letters | Year: 2014

Oceanic dispersal and connectivity have been identified as crucial factors for structuring marine populations and designing marine protected areas (MPAs). Focusing on larval dispersal by ocean currents, we propose an approach coupling Lagrangian transport and new tools from Network Theory to characterize marine connectivity in the Mediterranean basin. Larvae of different pelagic durations and seasons are modeled as passive tracers advected in a simulated oceanic surface flow from which a network of connected areas is constructed. Hydrodynamical provinces extracted from this network are delimited by frontiers which match multiscale oceanographic features. By examining the repeated occurrence of such boundaries, we identify the spatial scales and geographic structures that would control larval dispersal across the entire seascape. Based on these hydrodynamical units, we study novel connectivity metrics for existing reserves. Our results are discussed in the context of ocean biogeography and MPAs design, having ecological and managerial implications. Key Points Method coupling Lagrangian transport and network theory to study connectivity Provinces delimited by oceanic features organize basin-scale larval dispersal New connectivity metrics to assess existing MPAs and design future ones ©2014. American Geophysical Union. All Rights Reserved.

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