Exploració per tema "Quàntums, Teoria dels"
Ara es mostren els items 64-83 de 130
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Partículas huérfanas
(1997-11)
Article
Accés obert -
Passive decoy-state quantum key distribution with coherent light
(2015-06-12)
Article
Accés obertSignal state preparation in quantum key distribution schemes can be realized using either an active or a passive source. Passive sources might be valuable in some scenarios; for instance, in those experimental setups ... -
Phase diagram of a quantum Coulomb wire
(2015-12-09)
Article
Accés obert -
Phase estimation and order finding using the quantum fourier transform
(Universitat Politècnica de Catalunya, 2020-07)
Projecte Final de Màster Oficial
Accés obertQuantum computing over the past few decades has experienced a huge boost, due in part to the discovery of algorithms such as the Shor's algorithm which promises a significant reduction in complexity compared to its analogues ... -
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, ... -
Probing the strongly driven spin-boson model in a superconducting quantum circuit
(2018-04-11)
Article
Accés obertQuantum two-level systems interacting with the surroundings are ubiquitous in nature. The interaction suppresses quantum coherence and forces the system towards a steady state. Such dissipative processes are captured by ... -
Quantifying multipartite nonlocality via the size of the resource
(APS Physics, 2015-01-30)
Article
Accés obertThe 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
(Universitat Politècnica de Catalunya, 2011-02-04)
Projecte Final de Màster Oficial
Accés obertWe 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 Brownian motion with inhomogeneous damping and diffusion
(APS Physics, 2015-03-23)
Article
Accés obertWe analyze the microscopic model of quantum Brownian motion, describing a Brownian particle interacting with a bosonic bath through a coupling which is linear in the creation and annihilation operators of the bath, but may ... -
Quantum channel marginal problem
(American Physical Society, 2022-03-31)
Article
Accés obertGiven a set of local dynamics, are they compatible with a global dynamics? We systematically formulate these questions as quantum channel marginal problems. These problems are strongly connected to the generalization of ... -
Quantum control of population transfer and vibrational states via chirped pulses in four level density matrix equations
(2016-11-15)
Article
Accés obertWe investigate the effect of chirped excitation and the excitation detuning on the coherent control of population transfer and vibrational states in a four---level system. Density matrix equations are studied for optimally ... -
Quantum data compression feasibility study
(Universitat Politècnica de Catalunya, 2021-10-09)
Treball Final de Grau
Accés obertIn this project, two methods have been analyzed to obtain the information, previously com-pressed, through a quantum channel. Information travels through qubits, which are the unit of information in the world of quantum ... -
Quantum Error Correction - Decoders
(Universitat Politècnica de Catalunya, 2019-09-09)
Projecte Final de Màster Oficial
Accés obertError correction is used to correct any errors that may arise when sending any message, as errors are prone to appear due to noise. For classical codes, there are many decoders used, for example, belief propagation. ... -
Quantum error-correcting codes and their geometries
(European Mathematical Society (EMS), 2023-02-10)
Article
Accés obertThis is an expository article aiming to introduce the reader to the underlying mathematics and geometry of quantum error correction. Information stored on quantum particles is subject to noise and interference from the ... -
Quantum frequency conversion of single photons from 606 NM to telecom wavelengths for heterogeneous quantum networks
(Universitat Politècnica de Catalunya, 2020-11-19)
Projecte Final de Màster Oficial
Accés obertIn this work we experimentally and theoretically characterize the converted signal and the noise level of a quantum frequency conversion (QFC) device implemented for frequency down conversion from the visible to telecommunication ... -
Quantum knot invariants and the extension of $F_K$ to $SU(3)$
(Universitat Politècnica de Catalunya, 2023-05-22)
Treball Final de Grau
Accés obert
Realitzat a/amb: California Institute of Technology / California Institute of TechnologyUn dels problemes oberts més excitants en topologia quàntica es relaciona amb la categorificació de la teoria complexa de Chern-Simons. En aquest context, Gukov i Manolescu introdueixen una sèrie en dues variables $F_K(x,q)$ ... -
Quantum light source compatible with solid-state quantum memories and telecom networks
(Universitat Politècnica de Catalunya, 2016-11-24)
Tesi
Accés obertThis PhD thesis is in the scope of experimental quantum communication. It deals with correlated photon pairs of which one photon is stored in a solid state device, while the other photon is at telecom wavelength. Quantum ... -
Quantum Many-Body Systems in 1D: One Dimensional Hydrogen
(Universitat Politècnica de Catalunya, 2015-06-22)
Treball Final de Grau
Accés obertThe ground-state properties of one-dimensional spin polarized hydrogen, deuterium and tritium at zero temperature are obtained by means of Diffusion Monte Carlo calculations (DMC). The equations of state of the three ... -
Quantum many-body systems out of equilibrium
(Nature Publishing group, 2015-02-03)
Article
Accés obertHow do closed quantum many-body systems driven out of equilibrium eventually achieve equilibration? And how do these systems thermalize, given that they comprise so many degrees of freedom? Progress in answering these—and ... -
Quantum mechanics
(2009-10-21)
Audiovisual
Accés obert