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Autor Martín-Delgado Alcántara, Miguel Ángel |
Documentos disponibles escritos por este autor (45)
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Rodriguez, A. ; Martín-Delgado Alcántara, Miguel Ángel ; Rodriguez-Laguna, J. ; Sierra, G. ; Malyshev, Andrey ; Domínguez-Adame Acosta, Francisco ; Lemaistre, I. J. | Elsevier Science BV | 2001-12The standard one-parameter scaling theory predicts that all eigenstates in two-dimensional random lattices are weakly localized. We show that this claim fails in two-dimensional dipolar Frenkel exciton systems. The linear energy dispersion at th[...]![]()
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The 75th anniversary of Turing’s seminal paper and his centennial year anniversary occur in 2011 and 2012, respectively. It is natural to review and assess Turing’s contributions in diverse fields in the light of new developments that his though[...]![]()
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Mazza, Leonardo ; Bermudez, Alejandro ; Goldman, Nathan ; Rizzi, Matteo ; Martín-Delgado Alcántara, Miguel Ángel ; Lewenstein, Maciej | IOP Publishing | 2012-01-31We present a proposal for a versatile cold-atom-based quantum simulator of relativistic fermionic theories and topological insulators in arbitrary dimensions. The setup consists of a spin-independent optical lattice that traps a collection of hy[...]![]()
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Rodriguez, A. ; Malyshev, Andrey ; Sierra, G. ; Martín-Delgado Alcántara, Miguel Ángel ; Rodriguez-Laguna, J. ; Domínguez-Adame Acosta, Francisco | American Physical Society | 2003-01-17The single-parameter scaling hypothesis predicts the absence of delocalized states for noninteracting quasiparticles in low-dimensional disordered systems. We show analytically, using a supersymmetric method combined with a renormalization group[...]![]()
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We construct a new model of two-dimensional quantum spin systems that combines intrinsic topological orders and a global symmetry called ?avour symmetry. It is referred as the bilayer Doubled Semion model (bDS) and is an instance of symmetry-enr[...]![]()
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Viyuela García, Óscar ; Fu, Liang ; Martín-Delgado Alcántara, Miguel Ángel | American Physical Society | 2018-01-05We study the phase diagram and edge states of a two-dimensional p-wave superconductor with longrange hopping and pairing amplitudes. New topological phases and quasiparticles different from the usual short-range model are obtained. When both hop[...]![]()
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Bermúdez, A. ; Martín-Delgado Alcántara, Miguel Ángel ; Luis Aina, Alfredo | American Physical Society | 2008-06-11We study a relativistic spin-1/2 fermion subjected to a Dirac oscillator coupling and a constant magnetic field. An interplay between opposed chirality interactions culminates in the appearance of a relativistic quantum phase transition, which c[...]![]()
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Bermúdez, A. ; Porras Torres, Diego ; Martín-Delgado Alcántara, Miguel Ángel | American Physical Society | 2009-06We propose and theoretically analyze an experimental configuration in which lasers induce three-spin interactions between trapped ions. By properly choosing the intensities and frequencies of the lasers, three-spin couplings may be dominant or c[...]![]()
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Rivas Vargas, Ángel ; Viyuela García, Óscar ; Martín-Delgado Alcántara, Miguel Ángel | American Physical Society | 2013-10-31Thermal noise can destroy topological insulators (TI). However, we demonstrate how TIs can be made stable in dissipative systems. To that aim, we introduce the notion of band Liouvillian as the dissipative counterpart of band Hamiltonian, and sh[...]![]()
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We derive a master equation that allows us to study non-equilibrium dynamics of a quantum antiferromagnet. By resorting to spin-wave theory, we obtain a closed analytic form for the magnon decay rates. These turn out to be closely related to for[...]![]()
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Andrist, Ruben S. ; Katzgraber, Helmut J. ; Bombin, H ; Martín-Delgado Alcántara, Miguel Ángel | American Physical Society | 2016-07-12Topological quantum error correction codes are currently among the most promising candidates for efficiently dealing with the decoherence effects inherently present in quantum devices. Numerically, their theoretical error threshold can be calcul[...]![]()
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Viyuela García, Óscar ; Rivas Vargas, Ángel ; Martín-Delgado Alcántara, Miguel Ángel | IOP Publishing | 2012-03-30We have studied the dynamics of a generalized toric code based on qudits at finite temperature by finding the master equation coupling the code’s degrees of freedom to a thermal bath. We find that in the case of qutrits, new types of anyons and [...]![]()
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We introduce the characterization of a class of quantum PageRank algorithms in a scenario in which some kind of quantum network is realizable out of the current classical internet web, but no quantum computer is yet available. This class represe[...]![]()
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Ortiz Martín, Laura ; Varona Angulo, Santiago ; Martín-Delgado Alcántara, Miguel Ángel | American Physical Society | 2018-02-01We study the localization and oscillation properties of the Majorana fermions that arise in a two-dimensional electron gas (2DEG) with spin-orbit coupling (SOC) and a Zeeman field coupled with a d-wave superconductor. Despite the angular depende[...]![]()
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We introduce the concept of nested topological order in a class of exact quantum lattice Hamiltonian models with non-Abelian discrete gauge symmetry. The topological order present in the models can be partially destroyed by introducing a gauge s[...]![]()
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Viyuela, O. ; Rivas, A. ; Gasparinetti, S. ; Wallraff, A. ; Filipp, S. ; Martín-Delgado Alcántara, Miguel Ángel | Nature Publishing Group | 2018-02-12Topological insulators and superconductors at finite temperature can be characterized by the topological Uhlmann phase. However, a direct experimental measurement of this invariant has remained elusive in condensed matter systems. Here, we repor[...]![]()
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We construct a descriptive toy model that considers quantum effects on biological evolution starting from Chaitin’s classical framework. There are smart evolution scenarios in which a quantum world is as favorable as classical worlds for evoluti[...]![]()
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Andrist, Ruben S. ; Bombin, H. ; Katzgraber, Helmut G. ; Martín-Delgado Alcántara, Miguel Ángel | American Physical Society | 2012-05-14A promising approach to overcome decoherence in quantum computing schemes is to perform active quantum error correction using topology. Topological subsystem codes incorporate both the benefits of topological and subsystem codes, allowing for er[...]![]()
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Moreno Casares, Pablo Antonio ; Martín-Delgado Alcántara, Miguel Ángel | IOP publishing ltd | 2020-07Adversarial attacks represent a serious menace for learning algorithms and may compromise the security of future autonomous systems. A theorem by Khoury and Hadfield-Menell (KH), provides sufficient conditions to guarantee the robustness of acti[...]![]()
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De las Cuevas, G. ; Dürt, W. ; Van den Nest, M. ; Martín-Delgado Alcántara, Miguel Ángel | IOP Publishing | 2011-09-09We give efficient quantum algorithms to estimate the partition function of (i) the six-vertex model on a two-dimensional (2D) square lattice, (ii) the Ising model with magnetic fields on a planar graph, (iii) the Potts model on a quasi-2D square[...]![]()
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Nigg, Daniel ; Müller, Markus ; Martínez, Esteban A. ; Schindler, Philipp ; Hennrich, Markus ; Monz, Thomas ; Martín-Delgado Alcántara, Miguel Ángel ; Blatt, Rainer | Amer Assoc Advancement Science | 2014-07-18The construction of a quantum computer remains a fundamental scientific and technological challenge, in particular due to unavoidable noise. Quantum states and operations can be protected from errors using protocols for fault-tolerant quantum co[...]![]()
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Paparo, G.D. ; Müller, Markus ; Comellas, F. ; Martín-Delgado Alcántara, Miguel Ángel | Springer Heidelberg | 2014-07-22We review the main findings on the ranking capabilities of the recently proposed Quantum PageRank algorithm [1, 2] applied to large complex networks. The algorithm has been shown to identify unambiguously the underlying topology of the network a[...]![]()
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Paparo, Giuseppe Davide ; Müller, Markus ; Comellas, Francesc ; Martín-Delgado Alcántara, Miguel Ángel | Nature Publishing Group | 2013-10-04We investigate the behaviour of the recently proposed Quantum PageRank algorithm, in large complex networks. We find that the algorithm is able to univocally reveal the underlying topology of the network and to identify and order the most releva[...]![]()
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Díaz de la Cruz, J.M. ; Martín-Delgado Alcántara, Miguel Ángel | American Physical Society | 2014-03-19We introduce quantum information engines that extract work from quantum states and a single thermal reservoir. They may operate under three general conditions—(1) unitarily steered evolution (US), driven by a restricted set of available Hamilton[...]![]()
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Dauphin, Alexander ; Müller, Markus ; Martín-Delgado Alcántara, Miguel Ángel | American Physical Society | 2016-04-11We propose a realistic scheme to quantum simulate the so-far experimentally unobserved topological Mott insulator phase-an interaction-driven topological insulator-using cold atoms in an optical Lieb lattice. To this end, we study a system of sp[...]