NamePortillo Fernández, José Ramón
DepartmentMatemática Aplicada I
Knowledge areaMatemática Aplicada
Professional categoryProfesor Titular de Universidad
E-mailRequest
           
  • No. publications

    31

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Final Degree Project
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Sistemas dinámicos, grafos y redes biológicas

Aguilar Hidalgo, Gerardo; Portillo Fernández, José Ramón (2023)
El uso de grafos para representar sistemas dinámicos nos permite describir múltiples fenómenos en diferentes áreas de la ...
Article
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Graph-theoretic approach to Bell experiments with low detection efficiency

Xu, Zhen-Peng; Steinberg, Jonathan; Singh, Jaskaran; López Tarrida, Antonio José; Portillo Fernández, José Ramón; Cabello Quintero, Adán (Cornell University, 2023)
Bell inequality tests where the detection efficiency is below a certain threshold ηcrit can be simulated with local ...
Article
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Fuzzy logic programs as hypergraphs. Termination results

Díaz Moreno, Juan Carlos; Medina, Jesús; Portillo Fernández, José Ramón (Elsevier, 2022)
Graph theory has been a useful tool for logic programming in many aspects. In this paper, we propose an equivalent ...
Article
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Global structural stability and the role of cooperation in mutualistic systems

Portillo Fernández, José Ramón; Soler Toscano, Fernando; Langa Rosado, José Antonio (Public Library of Science (Plos), 2022)
Dynamical systems on graphs allow to describe multiple phenomena from different areas of Science. In particular, many ...
Article
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A network approach to analyze neuronal lineage and layer innervation in the Drosophila optic lobes

Valle Rodríguez, Alberto del; Cera López, Martín; Portillo Fernández, José Ramón (Public Library of Science, 2020)
The optic lobes of the fruit fly Drosophila melanogaster form a highly wired neural network composed of roughly 130.000 ...
Chapter of Book
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Towards the Use of Hypergraphs in Multi-adjoint Logic Programming

Díaz Moreno, Juan Carlos; Medina, Jesús; Portillo Fernández, José Ramón; Cornejo, María Eugenia; Kóczy, László T.; Medina, Jesús; Barros Ruano, Antonio Eduardo de (Springer, 2019)
The representation of a logic program by a graph is a useful procedure in order to obtain interesting properties of the ...
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Informational structures: A dynamical system approach for integrated information

Esteban Ruiz, Francisco José; Galadí García, Javier Alejandro; Langa Rosado, José Antonio; Portillo Fernández, José Ramón; Soler Toscano, Fernando (Public Library of Science, 2018)
Integrated Information Theory (IIT) has become nowadays the most sensible general theory of consciousness. In addition to ...
Article
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Irreductible Triangulations of the Once-Punctured Torus

Lawrencenko, Serge; Sulanke, Thom; Villar Liñán, María Trinidad; Zgonnik, Lyudmila Vladimirovna; Chávez de Diego, María José; Portillo Fernández, José Ramón (Sobolev Institute of Mathematics, 2018)
A triangulation of a surface with fixed topological type is called irreducible if no edge can be contracted to a vertex ...
Article
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Minimal true-implies-false and true-implies-true sets of propositions in noncontextual hidden-variable theories

Cabello Quintero, Adán; Portillo Fernández, José Ramón; Solís, Alberto; Svozil, Karl (American Physical Society, 2018)
An essential ingredient in many examples of the conflict between quantum theory and noncontextual hidden variables (e.g., ...
Article
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Quantum state-independent contextuality requires 13 rays

Cabello Quintero, Adán; Kleinmann, Matthias; Portillo Fernández, José Ramón (IOP Science, 2016)
We show that, regardless of the dimension of the Hilbert space, there exists no set of rays revealing state-independent ...
Article
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Monochromatic geometric k-factors for bicolored point sets with auxiliary points

Garijo Royo, Delia; Garrido Vizuete, María de los Angeles; Grima Ruiz, Clara Isabel; Márquez Pérez, Alberto; Moreno González, Auxiliadora; Portillo Fernández, José Ramón; Reyes Colume, Pedro; Robles Arias, Rafael; Valenzuela Muñoz, Jesús (2014)
Given a bicolored point set S, it is not always possible to construct a monochromatic geometric planar k-factor of S. We ...
Article
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Kochen-Specker set with seven contexts

Lisonek, Petr; Badziag, Piotr; Portillo Fernández, José Ramón; Cabello Quintero, Adán (American Physical Society, 2014)
The Kochen-Specker (KS) theorem is a central result in quantum theory and has applications in quantum information. Its ...
Article
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Basic exclusivity graphs in quantum correlations

Cabello Quintero, Adán; Danielsen, Lars Eirik; López Tarrida, Antonio José; Portillo Fernández, José Ramón (American Physical Society, 2013)
A fundamental problem is to understand why quantum theory only violates some noncontextuality (NC) inequalities and identify ...
Presentation
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An algorithm that constructs irreducible triangulations of once-punctured surfaces

Chávez de Diego, María José; Lawrecenko, Serge; Portillo Fernández, José Ramón; Villar Liñán, María Trinidad; Díaz Báñez, José Miguel; Garijo Royo, Delia; Márquez Pérez, Alberto; Urrutia Galicia, Jorge (2013)
A triangulation of a surface is irreducible if there is no edge whose contraction produces another triangulation of the ...
Article
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Quantum social networks

Cabello Quintero, Adán; Danielsen, Lars Eirik; López Tarrida, Antonio José; Portillo Fernández, José Ramón (IOP Science, 2012)
We introduce a physical approach to social networks (SNs) in which each actor is characterized by a yes–no test on a ...
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Experimental fully contextual correlations

Amselem, Elias; Danielsen, Lars Eirik; López Tarrida, Antonio José; Portillo Fernández, José Ramón; Bourennane, Mohamed; Cabello Quintero, Adán (American Physical Society, 2012)
Quantum correlations are contextual yet, in general, nothing prevents the existence of even more contextual correlations. ...
Article
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Cover contact graphs

Atienza Martínez, María Nieves; Castro Ochoa, Natalia de; Cortés Parejo, María del Carmen; Garrido Vizuete, María de los Angeles; Grima Ruiz, Clara Isabel; Hernández, Gregorio; Márquez Pérez, Alberto; Moreno González, Auxiliadora; Nöllenburg, Martin; Portillo Fernández, José Ramón; Reyes Colume, Pedro; Valenzuela Muñoz, Jesús; Villar Liñán, María Trinidad; Wolff, Alexander (2012)
We study problems that arise in the context of covering certain geometric objects called seeds (e.g., points or disks) by ...
Article
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A sufficient degree condition for a graph to contain all trees of size k

Balbuena, Camino; Márquez Pérez, Alberto; Portillo Fernández, José Ramón (Springer, 2011)
The Erdös–Sós conjecture says that a graph G on n vertices and number of edges e(G) > n(k − 1)/2 contains all trees of ...
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Optimal preparation of graph states

Cabello Quintero, Adán; Danielsen, Lars Eirik; López Tarrida, Antonio José; Portillo Fernández, José Ramón (American Physical Society, 2011)
We show how to prepare any graph state of up to 12 qubits with (a) the minimum number of controlled-Z gates and (b) the ...
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Memory cost of quantum contextuality

Cabello Quintero, Adán; Gühne, Otfried; Kleinmann, Matthias; Larsson, Jan Ake; Portillo Fernández, José Ramón (2011)
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Compact set of invariants characterizing graph states of up to eight qubits

Cabello Quintero, Adán; López Tarrida, Antonio José; Moreno,, Pilar; Portillo Fernández, José Ramón (American Physical Society, 2009)
The set of entanglement measures proposed by Hein, Eisert, and Briegel for n-qubit graph states [Phys. Rev. A 69, 062311 ...
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Entanglement in eight-qubit graph states

Cabello Quintero, Adán; López Tarrida, Antonio José; Moreno, Pilar; Portillo Fernández, José Ramón (Elsevier, 2009)
Any 8-qubit graph state belongs to one of the 101 equivalence classes under local unitary operations within the Clifford ...
Article
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Monochromatic geometric k-factors in red-blue sets with white and Steiner points

Garijo Royo, Delia; Garrido Vizuete, María de los Angeles; Grima Ruiz, Clara Isabel; Márquez Pérez, Alberto; Moreno González, Auxiliadora; Portillo Fernández, José Ramón; Reyes Colume, Pedro; Robles Arias, Rafael; Valenzuela Muñoz, Jesús (2009)
We study the existence of monochromatic planar geometric k-factors on sets of red and blue points. When it is not possible ...
PhD Thesis
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Sobre algunas clases polinomiales de satisfacibilidad : Aplicaciones a la resolución de problemas geométricos

Jesus Rodrigues, José Inácio de; Portillo Fernández, José Ramón (2009)
La Geometría Computacional posee un vasto campo de aplicaciones en las áreas de las Ciencias de Información Geográfica, ...
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Cover Contact Graphs

Atienza Martínez, María Nieves; Castro Ochoa, Natalia de; Cortés Parejo, María del Carmen; Garrido Vizuete, María de los Angeles; Grima Ruiz, Clara Isabel; Hernández, Gregorio; Márquez Pérez, Alberto; Moreno, Auxiliadora; Nöllenburg, Martin; Portillo Fernández, José Ramón; Reyes Colume, Pedro; Valenzuela Muñoz, Jesús; Villar Liñán, María Trinidad; Wolff, Alexander (2007)
We study problems that arise in the context of covering certain geometric objects (so-called seeds, e.g., points or disks) ...
Presentation
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PURL: A new polynomial-time solvable class of satisfiability

Portillo Fernández, José Ramón; Rodrigues, J. I. (Universidad de Cádiz, 2007)
In this work a new polynomial-time solvable class of satisfiability PURL ( PropUnit RemoveLiterals) is presented, based ...
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Single bend wiring on surfaces

Garrido Vizuete, María de los Angeles; Márquez Pérez, Alberto; Morgana, A.; Portillo Fernández, José Ramón (2002)
The following problem of rectilinear routing is studied: given pairs of points on a surface and a set of permissible ...
PhD Thesis
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Problemas de conexiones ortogonales

Portillo Fernández, José Ramón; Márquez Pérez, Alberto; Garrido Vizuete, María de los Angeles (2002)
El área de investigación sobre dibujos de grafos constituye una importante conexión entre diversos campos de la Matemática, ...
Presentation
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Conexiones ortogonales con vértices prefijados

Garrido Vizuete, María de los Angeles; Márquez Pérez, Alberto; Portillo Fernández, José Ramón; Reyes Colume, Pedro (Alberto Márquez, 2002)
Presentation
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NP-completitud fuerte y débil en problemas de etiquetado

Garrido Vizuete, María de los Angeles; Márquez Pérez, Alberto; Portillo Fernández, José Ramón; Reyes Colume, Pedro (Alberto Márquez, 2002)
Chapter of Book
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Labeling Subway Lines

Garrido Vizuete, María de los Angeles; Iturriaga, Claudia; Márquez Pérez, Alberto; Portillo Fernández, José Ramón; Reyes Colume, Pedro; Wolff, Alexander (2001)
Graphical features on map, charts, diagrams and graph drawings usually must be annotated with text labels in order to ...