Exploració per tema "Quantum theory"

Ara es mostren els items 29-48 de 103

    • Ground-state wave-function optimization for a quantum system of N bosons 

      Sala Juárez, Jordi (Universitat Politècnica de Catalunya, 2020-06-29)
      Treball Final de Grau
      Accés obert
      Aquest treball s'emmarca en el camp de l'estudi i simulació del comportament de sistemes quàntics complexos, les propietats dels quals vénen dictades per les lleis de la física quàntica. Aquestes juguen un paper fonamental ...

    • Highly efficient noise-assisted energy transport in classical oscillator systems 

      Leon Montiel, R de J.; Pérez Torres, Juan (2013-05)
      Article
      Accés obert
      Photosynthesis is a biological process that involves the highly-efficient transport of energy captured from the sun to a reaction center, where conversion into useful biochemical energy takes place. Even though one can ...

    • Holographic imaging of nanometer-scale phase-separation during a phase transition 

      Valls Conesa, Jordi (Universitat Politècnica de Catalunya, 2019-09-09)
      Projecte Final de Màster Oficial
      Accés obert
      Quantum materials is a broad term used in condensed matter physics to define materials whose collective properties are governed by quantum behavior, which are challenging to understand. These materials are sensitive to ...

    • Klein's paradox and the relativistic d-shell interaction in R3 

      Mas Blesa, Albert (Mathematical Sciences Publishers, 2017-12-20)
      Article
      Accés obert
      Under certain hypotheses of smallness on the regular potential V, we prove that the Dirac operator in Unexpected text node: 'R', coupled with a suitable rescaling of V, converges in the strong resolvent sense to the ...

    • Large-scale cuantum computing simulation using tensor networks 

      Sánchez Ramírez, Sergio (Universitat Politècnica de Catalunya, 2021-06-29)
      Projecte Final de Màster Oficial
      Accés obert
      Resource usage of traditional quantum computing simulation techniques scale exponentially fast either with the number of qubits or the depth of the circuit. Simulations of medium-sized circuits are then intractable but ...

    • Llenguatges de Programació Quàntica 

      Marcos Pitarch, Eric (Universitat Politècnica de Catalunya, 2009-06)
      Projecte/Treball Final de Carrera
      Accés obert
      Aprofundir en els coneixements de computació quàntica, tant des del vessant de la física com des del vessant de la teoria de la computació, que em situïn en un punt de "pre-recerca". Tenir un mapa de les diferents ...

    • Local discrimination of rotationally invariant states 

      Ronco Bonvehi, Elio (Universitat Politècnica de Catalunya / Universitat Autònoma de Barcelona, 2010)
      Projecte Final de Màster Oficial
      Accés obert
      We provide lower bounds for the minimum error discrimination probability of multipartite rotationally invariant states using separable measurements. The separability of the measurement operators has been investigated, ...

    • Loophole-free Bell inequality violation using electron spins separated by 1.3 kilometres 

      Hensen, B.; Bernien, H.; Dréau, A. E.; Reiserer, A.; Kalb, N.; Blok, M. S.; Ruitenberg, J.; Vermeulen, R. F. L.; Schouten, R. N.; Abellán, Carlos, 1990-; Amaya, W.; Pruneri, P.; Mitchell, Morgan W.; Markham, M.; Twitchen, D. J.; Elkouss, D.; Wehner, S.; Taminiau, Tim Hugo; Hanson, R. (Nature Publishing Group, 2015-10-21)
      Article
      Accés restringit per política de l'editorial
      More than 50 years ago1, John Bell proved that no theory of nature that obeys locality and realism2 can reproduce all the predictions of quantum theory: in any local-realist theory, the correlations between outcomes of ...

    • Macroscopic Quantum State Analyzed Particle by Particle 

      Beduini, Federica A.; Zielińska, Joanna Ada; Lucivero, Vito G.; Icaza Astiz, Yannick A. de; Mitchell, Morgan W. (ACS Publications, 2015-03-27)
      Article
      Accés obert
      Macroscopic quantum phenomena, e.g., superconductivity and squeezing, are believed to result from entanglement of macroscopic numbers of particles. We report the first direct study of this kind of entanglement: we use ...

    • Many-body bound states and induced interactions of charged impurities in a bosonic bath 

      Astrakharchik, Grigori; Peña Ardila, Luis Aldemar; Jachymski, Krzysztof; Negretti, Antonio (2023-12-01)
      Article
      Accés obert
      Induced interactions and bound states of charge carriers immersed in a quantum medium are crucial for the investigation of quantum transport. Ultracold atom-ion systems can provide a convenient platform for studying this ...

    • Matter Bounce Scenario in F(T) gravity 

      Haro Cases, Jaume; Amorós Torrent, Jaume (2016)
      Article
      Accés obert
      It is shown that teleparallel F(T) theories of gravity combined with holonomy corrected Loop Quantum Cosmology (LQC) support a Matter Bounce Scenario (MBS) which is a potential alternative to the inflationary paradigm. The ...

    • Maximally Nonlocal Theories Cannot Be Maximally Random 

      Torre, Gonzalo de la; Hoban, Matty J.; Dhara, Chirag; Prettico, Giuseppe; Acín dal Maschio, Antonio (APS, 2015-04-22)
      Article
      Accés obert
      Correlations that violate a Bell inequality are said to be nonlocal; i.e., they do not admit a local and deterministic explanation. Great effort has been devoted to study how the amount of nonlocality (as measured by a ...

    • Methods for solving 1D Stefan problems with application to contact melting 

      De Decker, Michelle (Universitat Politècnica de Catalunya, 2011-05)
      Projecte Final de Màster Oficial
      Accés obert
      Contact melting is the process during which a phase change material is placed in contact with a substrate that is at a temperature above the phase change temperature. This leads to melting of the phase change material and ...

    • Modeling interference with particle detectors in Quantum Field Theory 

      Quiles Pastor, Daniel (Universitat Politècnica de Catalunya, 2023-05-26)
      Treball Final de Grau
      Accés restringit per acord de confidencialitat
      Realitzat a/amb:   University of Waterloo
      L'òptica quàntica és la branca de la física que estudia la interacció entre la llum i la matèria. Aquesta teoria ha estat utilitzada per donar fonament teòric a molts experiments, però és comú fer servir moltes aproximacions. ...

    • Monte Carlo simulation of recent experiments with ultracold dipolar atoms in one dimension 

      Mikautadze, Giorgi (Universitat Politècnica de Catalunya, 2022-01-27)
      Treball Final de Grau
      Accés obert

    • Monte Carlo simulation of recent experiments with ultracold dipolar atoms in one dimension 

      Santos Plana, David (Universitat Politècnica de Catalunya, 2021-06-28)
      Treball Final de Grau
      Accés obert
      In a recent experiment (https://arxiv.org/abs/2002.10475) with ultracold dysprosium atoms, it was possible to realize a dipolar gas in one-dimensional geometry at low temperature. The goal of the project is to provide ...

    • Observation of the topological Anderson insulator in disordered atomic wires 

      Meier, Eric J.; An, Fangzhao Alex; Dauphin, Alexandre; Maffei, Maria; Massignan, Pietro Alberto; Hughes, Taylor L.; Gadway, Bryce (2018-11-23)
      Article
      Accés obert
      Topology and disorder have a rich combined influence on quantum transport. In order to probe their interplay, we synthesized one-dimensional chiral symmetric wires with controllable disorder via spectroscopic Hamiltonian ...

    • Observing subradiant dynamics in atomic arrays 

      Rodríguez Losada, María (Universitat Politècnica de Catalunya, 2020-09-08)
      Projecte Final de Màster Oficial
      Accés obert
      In recent years, there has been an increasing interest in subradiance in ordered atomic arrays, both for its rich phenomenology and its potential importance in realizing robust quantum optical applications. However, the ...

    • One qubit as a universal approximant 

      Pérez Salinas, Adrián; López Nuñez, David; García Saez, Artur; Forn Diaz, Pol; Latorre, José I. (American Physical Society, 2021-07)
      Article
      Accés obert
      A single-qubit circuit can approximate any bounded complex function stored in the degrees of freedom defining its quantum gates. The single-qubit approximant presented in this work is operated through a series of gates ...

    • One-shot capacity bounds on the simultaneous transmission of classical and quantum information 

      Salek Shishavan, Farzin; Anshu, Anurag; Hsieh, Min-Hsiu; Jain, Rahul; Rodríguez Fonollosa, Javier (2019-10-07)
      Article
      Accés obert
      We study the communication capabilities of a quan- tum channel under the most general channel model known as the one-shot model. Unlike classical channels that can only be used to transmit classical information (bits), a ...