Ara es mostren els items 1-17 de 17

  • Bounding Hilbert Space dimension from Temporal Correlations 

    Gallego López, Rodrigo (Universitat Politècnica de Catalunya, 2009-09-09)
    Projecte Final de Màster Oficial
    Accés obert
    In this work, we tackle the problem of assessing the Hilbert space dimension from the set of correlations obtained when measuring in a nonlocal black box scheme. The concept of a dimension witness and its recent applications ...
  • Characterizing and witnessing multipartite correlations : from nonlocality to contextuality 

    Sainz, Ana Belén (Universitat Politècnica de Catalunya, 2014-02-10)
    Tesi
    Accés obert
    In the past century, experimental discoveries have witnessed phenomena in Nature which challenge our everyday classical intuition. In order to explain these facts, quantum theory was developed, which so far has been able ...
  • Detection of nonlocality with two-body correlation functions 

    Aloy López, Albert (Universitat Politècnica de Catalunya, 2015-09-10)
    Projecte Final de Màster Oficial
    Accés obert
    Nonlocality detection in multipartite quantum systems is of great interest. The most popular tool to detect nonlocality in quantum systems are Bell inequalities. Most of the provided constructions of multipartite Bell ...
  • Device-independent information protocols: measuring dimensionality, randomness and nonlocality 

    Gallego López, Rodrigo (Universitat Politècnica de Catalunya, 2013-02-22)
    Tesi
    Accés obert
    The device-independent formalism is a set of tools to analyze experimental data and infer properties about systems, while avoiding almost any assumption about the functioning of devices. It has found applications both in ...
  • Entanglement and non local correlations: quantum resources for information processing 

    Prettico, Giuseppe (Universitat Politècnica de Catalunya, 2013-01-18)
    Tesi
    Accés obert
    Quantum Information Theory (QIT) studies how information can be processed and transmitted when encoded on quantum states. Practically, it can be understood as the effort to generalize Classical Information Theory to the ...
  • Entanglement and non-locality of pure quantum states. 

    Sainz, Ana Belén (Universitat Politècnica de Catalunya, 2010-07-19)
    Projecte Final de Màster Oficial
    Accés obert
    We study the process of majorisation and interconversion of bipartite states, and apply the formalism for analysing the local and non-local content of pure bipartite entangled states. We proved that the states which are ...
  • Entanglement in the graph-state formalism 

    Dhara, Chrirag (Universitat Politècnica de Catalunya, 2009-09-09)
    Projecte Final de Màster Oficial
    Accés obert
    We investigate the decoherence dynamics of a class of multi-particle entangled states - graph states - when subjected to individual noise processes. Recent analytical results for Pauli noise channels are summarized here. ...
  • Experimental tools for quantum networking operations with single photons and sinlge ions 

    Huwer, Jan Henning (Universitat Politècnica de Catalunya, 2014-01-29)
    Tesi
    Accés obert
    One promising approach for future quantum networks is the combination of strings of trapped ions as quantum-information processors with entangled photon pairs produced by spontaneous parametric down conversion (SPDC) to ...
  • From quantum foundations to quantum information protocols and back 

    Torre Carazo, Gonzalo de la (Universitat Politècnica de Catalunya, 2015-09-23)
    Tesi
    Accés obert
    Physics has two main ambitions: to predict and to understand. Indeed, physics aims for the prediction of all natural phenomena. Prediction entails modeling the correlation between an action, the input, and what is subsequently ...
  • Impact of imperfections on correlation-based quantum information protocols 

    Passaro, Elsa (Universitat Politècnica de Catalunya, 2016-05-30)
    Tesi
    Accés obert
    Quantum information science is a rapidly evolving field both from the theoretical and the experimental viewpoint, motivated by the fact that protocols exploiting quantum resources can perform tasks that are unfeasible in ...
  • Information-theoretical Secret-key agreement and Bound information 

    Kreissig, Martin (Universitat Politècnica de Catalunya, 2009-02-25)
    Projecte Final de Màster Oficial
    Accés obert
    One big problem of the communication between two parties is the secrecy. That means how much information a third party can obtain by intercepting the messages transmitted from one honest party to the other one. Therefore ...
  • Intrinsic randomness in non-local theories: quantification and amplification 

    Dhara, Chirag (Universitat Politècnica de Catalunya, 2013-06-12)
    Tesi
    Accés obert
    Quantum mechanics was developed as a response to the inadequacy of classical physics in explaining certain physical phenomena. While it has proved immensely successful, it also presents several features that severely ...
  • 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 ...
  • 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 ...
  • 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 random number generation based on vacuum field fluctuations 

    Abellan Sanchez, Carlos (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 ...
  • 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 ...