Ara es mostren els items 21-40 de 40

    • Local temperature and correlations in quantum many-body systems 

      Hernández Santana, Senaida (Universitat Politècnica de Catalunya, 2019-04-12)
      Tesi
      Accés obert
      Quantum Mechanics was established as the theory of the microscopic world, which allowed to understand processes in atoms and molecules. Its emergence led to a new scientific paradigm that quickly spread to different research ...
    • Machine learning for quantum physics and quantum physics for machine learning 

      Huembeli, Patrick (Universitat Politècnica de Catalunya, 2021-03-25)
      Tesi
      Accés obert
      Research at the intersection of machine learning (ML) and quantum physics is a recent growing field due to the enormous expectations and the success of both fields. ML is arguably one of the most promising technologies ...
    • Mathematical and Technological Aspects of Quantum Information Processing 

      Tura i Brugués, Jordi (Universitat Politècnica de Catalunya, 2011-03)
      Projecte Final de Màster Oficial
      Accés obert
      Since its genesis, quantum mechanics has proved to be a very accurate model for predicting the behavior of the world below the nanoscale. However, crucial breakthroughs in technology were needed in order to be able to e ...
    • Network nonlocality with continuous variables 

      Guerra Copete, José Carlos (Universitat Politècnica de Catalunya, 2021-09-08)
      Projecte Final de Màster Oficial
      Accés obert
      Since the birth of quantum mechanics, quantum information theory has seen a rise due to the contradiction with classical models. Some new concepts have surged up from the application of quantum models to information theory, ...
    • Nonlocal resources for quantum information tasks 

      Curchod, Florian John (Universitat Politècnica de Catalunya, 2018-10-11)
      Tesi
      Accés obert
      This thesis focusses on the essential features of Quantum Theory that are systems in an entangled state and Bell nonlocal correlations. Here, we take the angle of a resource theory and are interested in understanding better ...
    • Nonlocality in multipartite correlation networks 

      Würflinger, Lars Erik (Universitat Politècnica de Catalunya, 2013-09-18)
      Tesi
      Accés obert
      Despite the success of quantum mechanics in predicting the outcomes of experiments in many branches of physics, the foundations of the theory have remained subject of research and dispute. At the basis of this struggle ...
    • Quantifying randomness from Bell nonlocality 

      Bourdoncle, Boris (Universitat Politècnica de Catalunya, 2019-02-13)
      Tesi
      Accés obert
      The twentieth century was marked by two scientific revolutions. On the one hand, quantum mechanics questioned our understanding of nature and physics. On the other hand, came the realisation that information could be treated ...
    • Quantum algorithms for state reconstruction 

      Pedrol Ripoll, Eric (Universitat Politècnica de Catalunya, 2013-09-09)
      Projecte Final de Màster Oficial
      Accés obert
      [ANGLÈS] We review quantum state reconstruction schemes. We also present a quantum state preparation method by means of single-qubit operations and controlled not (C-NOT) gates. We aim at finding new quantum circuit schemes ...
    • Quantum computing by interrogation 

      Supic, Ivan (Universitat Politècnica de Catalunya, 2014-09-09)
      Projecte Final de Màster Oficial
      Accés obert
      [ANGLÈS] Quantum information theory forms a bridge between the foundations of quantum mechanics and its promising practical potentials. The extensive theoretical research has been conducted during the last decades and the ...
    • Quantum Error Correction - Decoders 

      Bordas Marchante, Eduard (Universitat Politècnica de Catalunya, 2019-09-09)
      Projecte Final de Màster Oficial
      Accés obert
      Error correction is used to correct any errors that may arise when sending any message, as errors are prone to appear due to noise. For classical codes, there are many decoders used, for example, belief propagation. ...
    • Quantum information outside quantum information 

      Pozas Kerstjens, Alejandro (Universitat Politècnica de Catalunya, 2019-10-15)
      Tesi
      Accés obert
      Quantum theory, as counter-intuitive as a theory can get, has turned out to make predictions of the physical world that match observations so precisely that it has been described as the most accurate physical theory ever ...
    • Quantum information with black boxes : lifting protocols from theory to implementation 

      Máttar Flores, Alejandro (Universitat Politècnica de Catalunya, 2017-10-17)
      Tesi
      Accés obert
      According to recent estimates, 10^18 bytes of data are generated on a daily basis around the globe. Our information society urges for radical solutions to treat such data deluge. By exploiting fundamental key elements of ...
    • Quantum multipartite entangled states, classical and quantum error correction 

      Raissi, Zahra (Universitat Politècnica de Catalunya, 2020-10-08)
      Tesi
      Accés obert
      Studying entanglement is essential for our understanding of such diverse areas as high-energy physics, condensed matter physics, and quantum optics. Moreover, entanglement allows us to surpass classical physics and ...
    • Quantum random number generation based on vacuum field fluctuations 

      Abellán, Carlos, 1990- (Universitat Politècnica de Catalunya, 2013-09-09)
      Projecte/Treball Final de Carrera
      Accés obert
      [ANGLÈS] Random numbers are extensively used in a broad range of applications. Nevertheless, there are two main markets from a commercial point of view: (i) secure communications and (ii) stochastic simulation. According ...
    • Resource theories of quantum dynamics 

      Hsieh, Chung Yun (Universitat Politècnica de Catalunya, 2022-10-10)
      Tesi
      Accés obert
      (English) As one of our most successful theories, quantum theory has greatly strengthened our understanding of nature and significantly advanced technologies. Specifically, quantum effects provide advantages in a broad ...
    • Secrecy extraction from no-signalling correlations 

      Pino Paulino, Sergi (Universitat Politècnica de Catalunya, 2016-06)
      Projecte/Treball Final de Carrera
      Accés obert
      Quantum cryptography studies tasks in Quantum Information Theory for cryptographic purposes, that is, for secret generation between parts from the principles of quantum mechanics. The fact itself, that quantum correlations ...
    • Simulating quantum measurements and quantum correlations 

      Guerini de Souza, Leonardo (Universitat Politècnica de Catalunya, 2018-01-29)
      Tesi
      Accés obert
      Realitzat a/amb:   Universidade Federal de Minas Gerais
      This PhD thesis is focused on the quantum measurement simulability problem, that is, deciding whether a given measurement can be simulated when only a restricted subset of measurements is accessible. We provide an operational ...
    • The communication cost of simulating POVMs over maximally entangled qubits 

      Ravell Rodríguez, Ricard (Universitat Politècnica de Catalunya, 2019-09-09)
      Projecte Final de Màster Oficial
      Accés obert
      In [Toner and Bacon, Phys. Rev. Lett. 91, 187904 (2003)], $1$ bit of communication was proven to be enough to simulate the statistics of local projective measurements over the maximally entangled state. Ever since then, ...
    • Thermodynamics and quantum correlations 

      Perarnau Llobet, Martí (Universitat Politècnica de Catalunya, 2016-06-06)
      Tesi
      Accés obert
      Thermodynamics traditionally deals with macroscopic systems at thermal equilibrium. However, since the very beginning of the theory, its range of applicability has only increased, nowadays being applied to virtually every ...
    • Witnessing non-Markovian evolutions 

      Santis, Dario de (Universitat Politècnica de Catalunya, 2021-06-22)
      Tesi
      Accés obert
      The formulation of quantum physics stands among the most revolutionary theories of the twentieth century. During the first decades of this century, many phenomena concerning the microscopic world were unexplained or had ...