Now showing items 1-20 of 25

  • A Combinatorial Approach to Nonlocality and Contextuality 

    Acin, Antonio; Fritz, Tobias; Leverrier, Anthony (Springer, 2015-03-01)
    Article
    Restricted access - publisher's policy
    So far, most of the literature on (quantum) contextuality and the Kochen– Specker theorem seems either to concern particular examples of contextuality, or be considered as quantum logic. Here, we develop a general formalism ...
  • Almost quantum correlations 

    Navascués, Miguel; Guryanova, Yelena; Hoban, Matty J.; Acín, Antonio (Nature Publishing group, 2015-02-20)
    Article
    Restricted access - publisher's policy
    Quantum theory is not only successfully tested in laboratories every day but also constitutes a robust theoretical framework: small variations usually lead to implausible consequences, such as faster-than-light communication. ...
  • An experimental setup for gray molasses sub-Doppler cooling of potassium gases 

    Bosch Aguilera, Manel (Universitat Politècnica de Catalunya, 2014-09-09)
    Master thesis
    Open Access
    [ÀNGLÈS] An experimental setup for cooling a gas of potassium atoms below the Doppler limit is presented. This method is known as gray molasses cooling. It will be implemented using light blue light blue detuned with respect ...
  • Entanglement and non-locality of pure quantum states. 

    Sainz, Ana Belén (Universitat Politècnica de Catalunya, 2010-07-19)
    Master thesis
    Open Access
    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 ...
  • External fluctuations in front propagation 

    Armero Rovira, J.; Sancho, Jose Maria; Casademunt, Jaume; Lacasta Palacio, Ana María; Ramírez de la Piscina Millán, Laureano; Sagués Mestre, Francesc (American Physical Society, 1996-04-01)
    Article
    Open Access
    We study the effects of external noise in a one-dimensional model of front propagation. Noise is introduced through the fluctuations of a control parameter leading to a multiplicative stochastic partial differential equation. ...
  • First-passage times for a marginal state driven by colored noise 

    Ramírez de la Piscina Millán, Laureano; Sancho, Jose Maria (The American Physical Society, 1991-01-18)
    Article
    Open Access
    The dynamical process through a marginal state (saddle point) driven by colored noise is studied. For small correlation time of the noise, the mean first-passage time and its variance are calculated using standard methods. ...
  • From poly(3,4-ethylenedioxythiophene) to poly(3,4-phenylenedioxythiophene) : impact of the ethylene bridge by the phenyl ring in the molecular propierties 

    Carrión Fajardo, Sergio (Universitat Politècnica de Catalunya, 2010-09)
    Master thesis
    Restricted access - author's decision
    The structural and electronic properties of poly(3,4-phenylenedioxythiophene) and poly(3,4- ethylenedioxythiophene) have been studied using quantum mechanical methods. Calculations have been performed considering a series ...
  • Highly efficient noise-assisted energy transport in classical oscillator systems 

    Leon Montiel, R de J.; Pérez Torres, Juan (2013-05)
    Article
    Open Access
    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 ...
  • Llenguatges de Programació Quàntica 

    Marcos Pitarch, Eric (Universitat Politècnica de Catalunya, 2009-06)
    Master thesis (pre-Bologna period)
    Open Access
    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 CatalunyaUniversitat Autònoma de Barcelona, 2010)
    Master thesis
    Open Access
    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, ...
  • Macroscopic Quantum State Analyzed Particle by Particle 

    Beduini, Federica A.; Zielińska, Joanna A.; Lucivero, Vito G.; Icaza Astiz, Yannick A. de; Mitchell, Morgan W. (ACS Publications, 2015-03-27)
    Article
    Open Access
    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 ...
  • Methods for solving 1D Stefan problems with application to contact melting 

    De Decker, Michelle (Universitat Politècnica de Catalunya, 2011-05)
    Master thesis
    Open Access
    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 ...
  • Past, present and challenges in Yang-Mills theory 

    Tejedor Sánchez, Jose Luís (Universitat Politècnica de Catalunya, 2012-07)
    Master thesis
    Open Access
    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 ...
  • Quantifying multipartite nonlocality via the size of the resource 

    Curchod, Florian John; Gisin, Nicolas; Liang, Yeong-Cherng (APS Physics, 2015-01-30)
    Article
    Open Access
    The generation of (Bell-)nonlocal correlations, i.e., correlations leading to the violation of a Bell-like inequality, requires the usage of a nonlocal resource, such as an entangled state. When given a correlation (a ...
  • Quantum annealing of a hard combinatorial problem 

    Lecina Casas, Daniel (Universitat Politècnica de Catalunya, 2011-02-04)
    Master thesis
    Open Access
    We present the numerical results obtained using quantum annealing (QA) in a hard combinatorial problem: the coloring problem (q-COL) of an Erd˝os-R´enyi graph. We first propose a quantum coloring Hamiltonian, natural ...
  • Quantum mechanics 

    Vilaseca Alavedra, Ramon; Acín dal Maschio, Antonio (2009-10-21)
    Audiovisual
    Open Access
  • Quantum mechanics: No more fields 

    Lewenstein, Maciej (Nature Publishing group, 2015-01-05)
    Article
    Open Access
    A self-accelerating electronic wave packet can acquire a phase akin to the Aharonov–Bohm effect, but in the absence of a magnetic field.
  • Scalability analysis of Dalton, a molecular structure program 

    Aguilar, Xavier; Schliephake, Michael; Vahtras, Olav; Giménez Lucas, Judit; Laure, Erwin (Elsevier, 2013-10)
    Article
    Restricted access - publisher's policy
    Dalton is a molecular electronic structure program featuring common methods of computational chemistry that are based on pure quantum mechanics (QM) as well as hybrid quantum mechanics/molecular mechanics (QM/MM). It is ...
  • Scaling Dalton: a molecular electronic structure program 

    Aguilar, Xavier; Schliepake, Michael; Vahtras, Olav; Giménez Lucas, Judit; Laure, Erwin (Institute of Electrical and Electronics Engineers (IEEE), 2011)
    Conference report
    Restricted access - publisher's policy
    Dalton is a molecular electronic structure program featuring common methods of computational chemistry that are based on pure quantum mechanics (QM) as well as hybrid quantum mechanics/molecular mechanics (QM/MM). It is ...
  • Single amino acid mutation controls hole transfer dynamics in DNAmethyltransferase HhaI complexes 

    Corbella, Marina; Voityuk, Alexander A.; Curutchet, Carles (Barcelona Supercomputing Center, 2015-05-05)
    Conference report
    Open Access
    Different mutagenic effects are generated by DNA oxidation that implies the formation of radical cation states (socalled holes) on purine nucleobases in the π stack. The interaction of DNA with proteins may protect DNA ...