Exploració per altres contribucions "Pérez Torres, Juan"
Ara es mostren els items 1-20 de 28
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A super frequency-shifter: enhancing the capabilities of acousto-optic modulators
(Universitat Politècnica de Catalunya, 2012-09-06)
Projecte Final de Màster Oficial
Accés obert[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 ... -
Absorption spectroscopy with quantum light: experimental and theoretical simulations based on arbitrary spectral shapes generated with a programable filter
(Universitat Politècnica de Catalunya, 2023-09-06)
Projecte Final de Màster Oficial
Accés obert
Realitzat a/amb: Institut de Ciències Fotòniques (ICFO)Absorption spectroscopy is a useful technique to detect the presence of specific elements in samples. However, its usefulness can be severely limited in certain frequency bands due to technological limitations, such as the ... -
Automatic compensation of polarisation drifts in an optical fibre
(Universitat Politècnica de Catalunya, 2020-06)
Treball Final de Grau
Accés obertIn 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
(Universitat Politècnica de Catalunya, 2018-08-27)
Projecte Final de Màster Oficial
Accés obertWe 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
(Universitat Politècnica de Catalunya, 2017-10-24)
Treball Final de Grau
Accés obertWe 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 ... -
Demonstration of new experimental schemes for imaging and sensing: from quantum to classical and back
(Universitat Politècnica de Catalunya, 2023-11-14)
Tesi
Accés obert(English) This Ph.D. thesis presents research in imaging and optical sensing, exploring novel concepts, and diverse applications. The experimental schemes put forward here are based on simulating specific aspects of quantum ... -
Efficient generation of new optical wavelengths by means of second harmonic generation in AlGaAs Bragg reflection waveguides
(Universitat Politècnica de Catalunya, 2011-09-19)
Projecte/Treball Final de Carrera
Accés obertEnglish: 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
(Universitat Politècnica de Catalunya, 2017-02-14)
Tesi
Accés obertThe 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 ... -
Experimental control of high-dimensional entanglement for multicore fiber based QKD
(Universitat Politècnica de Catalunya, 2023-07-11)
Treball Final de Grau
Accés restringit per acord de confidencialitat
Realitzat a/amb: Institut de Ciències Fotòniques (ICFO)Quantum Key Distribution (QKD) is a crucial step in quantum cryptography protocols, as a secure distribution of the secret key is determinant in the performance of the system. Some QKD protocols like E91 require the ... -
Fundamental limits of phase estimation with nonlinear interferometers
(Universitat Politècnica de Catalunya, 2022-09-09)
Projecte Final de Màster Oficial
Accés obert
Realitzat a/amb: Universitat de Barcelona / Universitat Autònoma de BarcelonaInterferometers 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
(Universitat Politècnica de Catalunya, 2012-09-06)
Projecte Final de Màster Oficial
Accés obert[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
(Universitat Politècnica de Catalunya, 2016-10)
Treball Final de Grau
Accés restringit per decisió de l'autorExperimental 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
(Universitat Politècnica de Catalunya, 2018-07-17)
Projecte Final de Màster Oficial
Accés obert
Realitzat a/amb: 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
(Universitat Politècnica de Catalunya, 2021-07-13)
Treball Final de Grau
Accés obertIn 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 ... -
Optical parameter sensing: sensitivity limits and the advantages of using spatial modes of light
(Universitat Politècnica de Catalunya, 2023-04-26)
Tesi
Accés obert(English) Resolution enhancement in modern optical metrology techniques has been possible due to significant technological improvements. The accurate and precise control of wavelength, bandwidth, and power of light sources; ... -
Phase estimation based on quantum correlation beyond entanglement
(Universitat Politècnica de Catalunya, 2021-07-15)
Treball Final de Grau
Accés obertLes 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
(Universitat Politècnica de Catalunya, 2015-05-22)
Tesi
Accés obertStructured 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
(Universitat Politècnica de Catalunya, 2014-10-17)
Tesi
Accés obertNon-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
(Universitat Politècnica de Catalunya, 2017-07-09)
Projecte Final de Màster Oficial
Accés obert
Realitzat a/amb: Institut de Ciències Fotòniques (ICFO) / Universitat de Barcelona / Universitat Autònoma de BarcelonaWe 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
(Universitat Politècnica de Catalunya, 2019-06)
Treball Final de Grau
Accés obertIn 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 ...