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Autor Martín-Delgado Alcántara, Miguel Ángel |
Documentos disponibles escritos por este autor (45)
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Davide Paparo, Giuseppe ; Dunjko, Vedran ; Makmal, Adi ; Martín-Delgado Alcántara, Miguel Ángel ; Briegel, Hans J. | American Physical Society (APS) | 2014-06-08Can quantum mechanics help us build intelligent learning agents? A defining signature of intelligent behavior is the capacity to learn from experience. However, a major bottleneck for agents to learn in reallife situations is the size and comple[...]![]()
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Goldman, N. ; Satija, I. ; Nikolic, P. ; Bermúdez, A. ; Martín-Delgado Alcántara, Miguel Ángel ; Lewenstein, M. ; Spielman, I.B. | American Physical Society | 2010-12-16We lay out an experiment to realize time-reversal invariant topological insulators in alkali atomic gases. We introduce an original method to synthesize a gauge field in the near field of an atom chip, which effectively mimics the effects of spi[...]![]()
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Weinfurtner, Silke ; De las Cuevas, Gemma ; Martín-Delgado Alcántara, Miguel Ángel ; Briegel, Hans J. | IOP publishing ltd | 2014-03-07We present a new description of discrete space-time in 1+1 dimensions in terms of a set of elementary geometrical units that represent its independent classical degrees of freedom. This is achieved by means of a binary encoding that is ergodic i[...]![]()
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Dauphin, Alexander ; Müller, Markus ; Martín-Delgado Alcántara, Miguel Ángel | American Physical Society | 2012-11-20In this work we consider a system of spinless fermions with nearest and next-to-nearest neighbor repulsive Hubbard interactions on a honeycomb lattice, and propose and analyze a realistic scheme for analog quantum simulation of this model with c[...]![]()
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Cats, P. ; Quelle, A. ; Viyuela, O. ; Martín-Delgado Alcántara, Miguel Ángel ; Morais Smith, C. | American Physical Society | 2018-03-12We find a series of topological phase transitions of increasing order, beyond the more standard second-order phase transition in a one-dimensional topological superconductor. The jumps in the order of the transitions depend on the range of the p[...]![]()
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Bombin, H. ; Ruben, S. Andrist ; Masayuki, Ohzeki ; Katzgraber, Helmut G. ; Martín-Delgado Alcántara, Miguel Ángel | American Physical Society (APS) | 2012-04-30The inevitable presence of decoherence effects in systems suitable for quantum computation necessitates effective error-correction schemes to protect information from noise. We compute the stability of the toric code to depolarization by mapping[...]![]()
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We have applied the recently developed theory of topological Uhlmann numbers to a representative model of a topological insulator in two dimensions, the Qi-Wu-Zhang model. We have found a stable symmetry-protected topological phase under externa[...]![]()
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Jeskel, Jan ; Rivas, Ángel ; Ahmed, Muhammad H. ; Martín-Delgado Alcántara, Miguel Ángel ; Cole, Jared H. | IOP publishing ltd | 2018-09-18The dynamics and thermal equilibrium of spin waves (magnons) in a quantum ferromagnet as well as the macroscopic magnetisation are investigated. Thermal noise due to an interaction with lattice phonons and the effects of spatial correlations in [...]![]()
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The launch in 2019 of the new international system of units is an opportunity to highlight the key role that the fundamental laws of physics and chemistry play in our lives and in all the processes of basic research, industry and commerce. The m[...]![]()
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Xu, Ying ; De las Cuevas, Gemma ; Dür, Wolfgang ; Briegel, Hans J. ; Martín-Delgado Alcántara, Miguel Ángel | IOP Publishing | 2011-02-07We show that the partition function of many classical models with continuous degrees of freedom, e.g. abelian lattice gauge theories and statistical mechanical models, can be written as the partition function of an (enlarged) four–dimensional la[...]![]()
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Viyuela García, Óscar ; Rivas Vargas, Ángel ; Martín-Delgado Alcántara, Miguel Ángel | American Physical Society | 2012-10-23We have studied the dynamical thermal effects on the protected end states of a topological insulator (TI) when it is considered as an open quantum system in interaction with a noisy environment at a certain temperature T . As a result, we find t[...]![]()
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Viyuela García, Óscar ; Vodola, V. ; Pupillo, G. ; Martín-Delgado Alcántara, Miguel Ángel | American Physical Society | 2016-09-13We discover novel topological effects in the one-dimensional Kitaev chain modified by long-range Hamiltonian deformations in the hopping and pairing terms. This class of models display symmetry-protected topological order measured by the Berry/Z[...]![]()
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Varona Angulo, Santiago ; Ortiz Martín, Laura ; Viyuela, O. ; Martín-Delgado Alcántara, Miguel Ángel | IOP publishing ltd | 2018-10-03We compute the topological phase diagram of 2D tetragonal superconductors for the only possible nodeless pairing channels compatible with that crystal symmetry. Subject to a Zeeman field and spin-orbit coupling, we demonstrate that these superco[...]![]()
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Andrist, Ruben S. ; Katzgraber, Helmut G. ; Bombin, H. ; Martín-Delgado Alcántara, Miguel Ángel | IOP Publishing | 2011-08-08We compute the error threshold of color codes—a class of topological quantum codes that allow a direct implementation of quantum Clifford gates—when both qubit and measurement errors are present. By mapping the problem onto a statistical–mechani[...]![]()
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Vodola, Davide ; Amaro, David ; Martín-Delgado Alcántara, Miguel Ángel ; Mülller, Markus | IOP publishing ltd | 2018-08-06In this Letter, we establish and explore a new connection between quantum information theory and classical statistical mechanics by studying the problem of qubit losses in 2D topological color codes. We introduce a protocol to cope with qubit lo[...]![]()
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Song, Hao ; Prem, Abhinav ; Huang, Sheng-Jie ; Martín-Delgado Alcántara, Miguel Ángel | American Physical Society | 2019-04-09We study novel three-dimensional gapped quantum phases of matter which support quasiparticles with restricted mobility, including immobile " fracton" excitations. So far, most existing fracton models may be instructively viewed as generalized Ab[...]![]()
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Viyuela García, Óscar ; Rivas Vargas, Ángel ; Martín-Delgado Alcántara, Miguel Ángel | American Physical Society | 2014-08-13We construct a topological invariant that classifies density matrices of symmetry-protected topological orders in two-dimensional fermionic systems. As it is constructed out of the previously introduced Uhlmann phase, we refer to it as the topol[...]![]()
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Viyuela, O. ; Rivas, A. ; Martín-Delgado Alcántara, Miguel Ángel | American Physical Society | 2014-04-02We introduce the Uhlmann geometric phase as a tool to characterize symmetry-protected topological phases in one-dimensional fermion systems, such as topological insulators and superconductors. Since this phase is formulated for general mixed qua[...]![]()
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Ohzeki, Masayuki ; Thomas, Creighton K. ; Katzgraber, Helmut G. ; Bombin, H. ; Martín-Delgado Alcántara, Miguel Ángel | IOP Publishing | 2011-02-01We study the effects of disorder on the slope of the disorder–temperature phase boundary near the Onsager point (T_(c) = 2.269 . . .) in spin-glass models. So far, studies have focused on marginal or irrelevant cases of disorder. Using duality a[...]![]()
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Bermúdez, A. ; Mazza, L. ; Rizzi, M. ; Goldman, N. ; Lewenstein, M. ; Martín-Delgado Alcántara, Miguel Ángel | American Physical Society | 2010-11-04We show that ultracold Fermi gases in optical superlattices can be used as quantum simulators of relativistic lattice fermions in 3 þ 1 dimensions. By exploiting laser-assisted tunneling, we find an analogue of the so-called naive Dirac fermions[...]