Now showing items 1-18 of 18

    • 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 ...
    • 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 ...
    • 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-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 ...
    • 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. ...
    • Study of the role of dimensionality in the entanglement of detector-quantum field systems 

      Melgarejo Lermas, Irene (Universitat Politècnica de Catalunya, 2018-05-19)
      Bachelor thesis
      Restricted access - author's decision
      A quantum system obeys an area law if the entanglement of a subsystem with the rest scales as the boundary ("area") of the subsystem. The importance of this concept is highlighted by its connexion with black hole thermodynamics ...
    • Time reversal communications for spatial mode multiplexing communication systems 

      Sevilla Dalmau, Daniel (Universitat Politècnica de Catalunya, 2017-06)
      Bachelor thesis
      Restricted access - author's decision
    • Weak value amplification : new insights and applications 

      Salazar Serrano, Luis José (Universitat Politècnica de Catalunya, 2016-10-13)
      Doctoral thesis
      Open Access
      Weak Value Amplification (WVA) is a signal enhancement technique proposed in 1988 by Aharonov, Albert, and Vaidman that has been widely used to measure tiny changes that otherwise cannot be determined because of technical ...