Browsing by Contributor "Pérez Torres, Juan"

Now showing items 1-20 of 24

    • A super frequency-shifter: enhancing the capabilities of acousto-optic modulators 

      Salazar Serrano, Luis José (Universitat Politècnica de Catalunya, 2012-09-06)
      Master thesis
      Open Access
      [ANGLÈS] We put forward a new scheme to enhance the capabilities of currently available acousto-optic frequency shifters (AOFS) by making use of the idea of weak value amplification. The key result of our approach is that ...

    • Automatic compensation of polarisation drifts in an optical fibre 

      Cichy Cusi, Simon (Universitat Politècnica de Catalunya, 2020-06)
      Bachelor thesis
      Open Access
      In days where Science Fiction uses the word ?Quantum? to justify any weird phenomena, we are actually on the edge of the Second Quantum Revolution. The ability to harness the potential of the quantum state of single particles ...

    • Coherence-based quantum random number generator 

      Álvarez Velásquez, Juan Rafael (Universitat Politècnica de Catalunya, 2018-08-27)
      Master thesis
      Open Access
      We consider the random change of the phase of a laser as the physical source of randomness that allows the implementation a new type of quantum random number generator (QRNG) . We analyze the phase noise model of a laser ...

    • Correlations and coherence: an experimental proposal 

      Sendra Molins, Lluc (Universitat Politècnica de Catalunya, 2017-10-24)
      Bachelor thesis
      Open Access
      We propose and realize a variation of Mandel's experiment where the Englert's inequality can be demonstrated. This is a relation of the coherence and the which-way information, which is one of the most fundamental results ...

    • Efficient generation of new optical wavelengths by means of second harmonic generation in AlGaAs Bragg reflection waveguides 

      Valles Mari, Adam (Universitat Politècnica de Catalunya, 2011-09-19)
      Master thesis (pre-Bologna period)
      Open Access
      English: In this project has been designed and implemented a setup to produce the nonlinear process of the second harmonic generation (SHG) in Bragg reflection waveguides (BRW). Starting with the adjustment of a tunable ...

    • Entanglement, Bell’s inequalities and coherence : new ideas and new scenarios 

      Valles Mari, Adam (Universitat Politècnica de Catalunya, 2017-02-14)
      Doctoral thesis
      Open Access
      The work presented in this thesis, mostly experimental, is based on three main pillars: the concepts of entanglement, Bell¿s inequalities and coherence. Entanglement is a very special type of correlation that can exist ...

    • Fundamental limits of phase estimation with nonlinear interferometers 

      Pérez Castro, David (Universitat Politècnica de Catalunya, 2022-09-09)
      Master thesis
      Open Access
      Covenantee:   Universitat de Barcelona / Universitat Autònoma de Barcelona
      Interferometers have established themselves as good phase sensitivity estimators, although passive interferometers (those characterized by the SU(2) group) are bounded by the shot noise limit. If we want to overcome this ...

    • Generation of polarization entangled photon pairs in Bragg reflection waveguides 

      Vallés Marí, Adam (Universitat Politècnica de Catalunya, 2012-09-06)
      Master thesis
      Open Access
      [ANGLÈS] We report the observation of polarization entangled photon pairs generated by means of type-II spontaneous parametric down-conversion (SPDC) within an AlGaAs Bragg reflection waveguide (BRW). Even though SPDC in ...

    • Measurement of noise-induced loss of polarization coherence 

      Jiménez Machado, Gerard (Universitat Politècnica de Catalunya, 2016-10)
      Bachelor thesis
      Restricted access - author's decision
      Experimental implementation of a Quantum-Optical Coherence Tomography (Q-OCT) system, by means of measuring and quantifying induced coherence.

    • Optical coherence tomography with a nonlinear interferometer 

      Sendra Molins, Lluc (Universitat Politècnica de Catalunya, 2018-07-17)
      Master thesis
      Open Access
      Covenantee:   Institut de Ciències Fotòniques (ICFO)
      We derive what is the signal and the sensitivity of a nonlinear interferometer (Mach-Zehnder or Michelson), that is a novel approach to perform Optical Coherence Tomography (OCT). The physical idea behind this goes back ...

    • Optical coherence tomography with nonlinear interferometers 

      Kirchner Sala, Helena (Universitat Politècnica de Catalunya, 2021-07-13)
      Bachelor thesis
      Open Access
      In recent years, quantum properties of light are opening the door to new applications, especially in communications and high-resolution probing and imaging. Optical coherence tomography (OCT) is an imaging technique ...

    • Phase estimation based on quantum correlation beyond entanglement 

      Cordero Boronat, Oscar (Universitat Politècnica de Catalunya, 2021-07-15)
      Bachelor thesis
      Open Access
      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, ...

    • Photonic applications based on the use of structured light 

      Rosales Guzmán, Carmelo G. (Universitat Politècnica de Catalunya, 2015-05-22)
      Doctoral thesis
      Open Access
      Structured light beams, this is, beams whose phase changes from point to point in the transverse plane, provides with an alternative tool to search for new applications, or simply to expand the capabilities of current ...

    • Photonic entanglement : new sources and new applications 

      Svozilík, Jiŕí (Universitat Politècnica de Catalunya, 2014-10-17)
      Doctoral thesis
      Open Access
      Non-classical correlations, usually referred as entanglement, are ones of the most studied and discussed features of Quantum Mechanics, since the initial introduction of the concept in the decade of 1930s. Even nowadays, ...

    • Quantum Coherence and Quantum Correlations 

      Jiménez Machado, Gerard (Universitat Politècnica de Catalunya, 2017-07-09)
      Master thesis
      Open Access
      Covenantee:   Institut de Ciències Fotòniques (ICFO) / Universitat de Barcelona / Universitat Autònoma de Barcelona
      We demonstrate a new type of optical coherence tomography (OCT) scheme based on ideas put forward by Mandel's group in 1991, curiously the same year than the first OCT scheme was demonstrated. It involves the measurement ...

    • Quantum limits of the resolution of imaging and lidar systems 

      Lamaison Vidarte, Miren (Universitat Politècnica de Catalunya, 2019-06)
      Bachelor thesis
      Open Access
      In this project we study the ultimate precision of a Lidar system aimed at estimating the position and velocity of a target with quantum light (entangled photons). By comparison, a standard Lidar system determines the ...

    • Quantum teleportation of spatial images: fundamentals and technological limitations 

      Compte Prades, Joel (Universitat Politècnica de Catalunya, 2022-09-07)
      Bachelor thesis
      Open Access
      Covenantee:   Institut de Ciències Fotòniques (ICFO) / Fundació Catalunya La Pedrera
      Quantum teleportation is a crucial resource in future quantum networks. It allows the transfer of quantum information unknown to two parties that share a quantum channel and a classical channel. It was proposed in 1993 [C. ...

    • Quantum-based spectroscopy and efficient energy transport with biomolecules 

      León Montiel, Roberto de Jesús (Universitat Politècnica de Catalunya, 2014-09-30)
      Doctoral thesis
      Open Access
      For many years, the fields of quantum optics and biology have rarely shared a common path. In quantum optics, most of the concepts and techniques developed over the years stand for systems where only a few degrees of freedom ...

    • Spectroscopy with spatial modes of light 

      Villasante Cánovas, Jaume Albert (Universitat Politècnica de Catalunya, 2021-07-13)
      Bachelor thesis
      Open Access
      It is well known that when it comes to imaging with traditional optics, limitationsare often encountered due to diffraction effects.In this project we want to study the application of the so-called spatial spec-troscopy, ...

    • Storage of single photons in a hot Rubidium vapor 

      Scavuzzo Montaña, Lara (Universitat Politècnica de Catalunya, 2017-06)
      Bachelor thesis
      Open Access
      Covenantee:   Kungliga Tekniska högskolan
      Quantum technologies open doors to outstanding applications, at the same time as they pose many scientific challenges. The promise of intrinsically secure communications relies on the implementation of quantum networks. ...