Exploració per tema "Quantum theory"

Ara es mostren els items 37-56 de 103

    • 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 ...

    • Partículas huérfanas 

      Barceló Garcia, Miquel (1997-11)
      Article
      Accés obert

    • Passive decoy-state quantum key distribution with coherent light 

      Curty, M.; Jofre Cruanyes, Marc; Pruneri, Valerio; Mitchell, Morgan W. (2015-06-12)
      Article
      Accés obert
      Signal state preparation in quantum key distribution schemes can be realized using either an active or a passive source. Passive sources might be valuable in some scenarios; for instance, in those experimental setups ...

    • Past, present and challenges in Yang-Mills theory 

      Tejedor Sánchez, Jose Luís (Universitat Politècnica de Catalunya, 2012-07)
      Projecte Final de Màster Oficial
      Accés obert
      Aquest treball tracta sobre les teories gauge de la física teòrica, la seva evolució des de el primer treball de Weyl (1918) fins als nostres dies tenint en compte el treball fonamental elaborat el 1954 per Yang i Mills que ...

    • Phase diagram of a quantum Coulomb wire 

      Ferré Porta, Guillem; Astrakharchik, Grigori; Boronat Medico, Jordi (2015-12-09)
      Article
      Accés obert

    • Phase estimation and order finding using the quantum fourier transform 

      Pérez Guijarro, Jordi (Universitat Politècnica de Catalunya, 2020-07)
      Projecte Final de Màster Oficial
      Accés obert
      Quantum computing over the past few decades has experienced a huge boost, due in part to the discovery of algorithms such as the Shor's algorithm which promises a significant reduction in complexity compared to its analogues ...

    • Phase estimation based on quantum correlation beyond entanglement 

      Cordero Boronat, Oscar (Universitat Politècnica de Catalunya, 2021-07-15)
      Treball Final de Grau
      Accés obert
      Les correlacions entre estats quàntics juguen un paper fonamental en moltes aplicacions de la tecnologia quàntica. Hi ha estats quàntics que tenen avantatges en diferents protocols, com l'estimació d'un paràmetre. Tot això, ...

    • Physics and machine learning: Emerging paradigms 

      Martín Guerrero, José; Lisboa, Paulo J G; Vellido Alcacena, Alfredo (I6doc.com, 2016)
      Text en actes de congrés
      Accés obert
      Current research in Machine Learning (ML) combines the study of variations on well-established methods with cutting-edge breakthroughs based on completely new approaches. Among the latter, emerging paradigms from Physics ...

    • Probing the strongly driven spin-boson model in a superconducting quantum circuit 

      Magazzù, Luca; Forn Diaz, Pol; Belyansky, Ron; Orgiazzi, Jean-Luc; Yurtalan, Muhammet; Otto, Martin R.; Lupascu, Adrian; Wilson, Christopher; Grifoni, Milena (2018-04-11)
      Article
      Accés obert
      Quantum two-level systems interacting with the surroundings are ubiquitous in nature. The interaction suppresses quantum coherence and forces the system towards a steady state. Such dissipative processes are captured by ...