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Browsing by Author "Arias Carrasco, José Miguel"
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A digital quantum simulation of the Agassi model
Pérez Fernández, Pedro; Arias Carrasco, José Miguel; García Ramos, José Enrique; Lamata, Lucas (2022)A digital quantum simulation of the Agassi model from nuclear physics is proposed and analyzed. The proposal is worked out for the case with four different sites. Numerical simulations and analytical estimations are presented ... 
Analytical transformed harmonic oscillator basis for continuum discretized coupled channels calculations
Moro, A. M.; Arias Carrasco, José Miguel; Gómez Camacho, Joaquín; Pérez Bernal, Francisco (American Physical Society, 2009)A new method for continuum discretization in continuumdiscretized coupledchannels calculations is proposed. The method is based on an analytic localscale transformation of the harmonicoscillatorwave functions proposed ... 
Configuration localized wave functions : general formalism and applications to vibrational spectroscopy of diatomic molecules
Pérez Bernal, Francisco; Arias Carrasco, José Miguel; Carvajal Zaera, Miguel; Gómez Camacho, Joaquín (American Physical Society, 2000)A general formalism for constructing configuration localized states for onedimensional potentials is presented. It allows the evaluation of accurate approximations to the vibrational matrix elements of the momentum operator ... 
Continuous unitary transformations in twolevel boson systems
Dusuel, Sébastien; Vidal, Julien; Arias Carrasco, José Miguel; Dukelsky, J.; García Ramos, José Enrique (American Physical Society, 20051230)Twolevel boson systems displaying a quantum phase transition from a spherical (symmetric) to a deformed (broken) phase are studied. A formalism to diagonalize Hamiltonians with O(2L + 1) symmetry for large number of ... 
Continuum coupling in onedimensional scattering using a transformed harmonic oscillator basis
Martel Bravo, Ismael; Pérez Bernal, Francisco; Rodríguez Gallardo, Manuela; Arias Carrasco, José Miguel; Gómez Camacho, Joaquín (American Physical Society, 2002)The coupling to the continuum is studied in a onedimensional problem that describes the interaction of a weakly bound composite object with a wall in a semiclassical approach. A transformed harmonic oscillator basis is ... 
Continuum discretization using orthogonal polynomials
Pérez Bernal, Francisco; Martel Bravo, Ismael; Arias Carrasco, José Miguel; Gómez Camacho, Joaquín (American Physical Society, 2003)A method for discretizing the continuum by using a transformed harmonic oscillator basis has recently been presented @Phys. Rev. A 63, 052111 ~2001!#. In the present paper, we propose a generalization of that formalism which ... 
Coulomb breakup in a transformed harmonic oscillator basis
Moro, A. M.; Pérez Bernal, Francisco; Arias Carrasco, José Miguel; Gómez Camacho, Joaquín (American Physical Society, 2006)The problem of Coulomb breakup in the scattering of a twobody loosely bound projectile by a heavy target is addressed. A basis of transformed harmonic oscillator (THO) wave functions is used to discretize the ... 
Coupling to breakup channels using a transformed harmonic oscillator basis
Moro, A. M.; Arias Carrasco, José Miguel; Gómez Camacho, Joaquín; Martel Bravo, Ismael; Pérez Bernal, Francisco; Crespo, R.; Nunes, F. (American Physical Society, 2001)The application of a recently proposed procedure for discretizing the continuum to collision processes involving weakly bound nuclei is studied. In particular, the coupling to breakup states in the collision of d 1208 ... 
Decoherence and quantum quench: their relationship with excited state quantum phase transitions
García Ramos, José Enrique; Arias Carrasco, José Miguel; Cejnar, P.; Dukelsky, J.; Pérez Fernández, Pedro; Relaño Pérez, Armando (American Institute of Physics, 201205)We study the similarities and differences between the phenomena of Quantum Decoherence and Quantum Quench in presence of an Excited State Quantum Phase Transition (ESQPT).We analyze, on one hand, the decoherence induced ... 
Decoherence as a signature of an excited state quantum phase transition
Relaño Pérez, Armando; Arias Carrasco, José Miguel; Dukelsky, J.; García Ramos, José Enrique; Pérez Fernández, Pedro (American Physical Society, 20081216)We analyze the decoherence induced on a single qubit by the interaction with a twolevel boson system with critical internal dynamics. We explore how the decoherence process is affected by the presence of quantum phase ... 
Decoherence due to an excited state quantum phase transition in a twolevel boson model
Pérez Fernández, Pedro; Relaño Pérez, Armando; Arias Carrasco, José Miguel; Dukelsky, J.; García Ramos, José Enrique (American Physical Society, 20090917)The decoherence induced on a single qubit by its interaction with the environment is studied. The environment is modeled as a scalar twolevel boson system that can go through either firstorder or continuousexcitedstate ... 
Digital quantum simulation of an extended Agassi model: Using machine learning to disentangle its phasediagram
Sáiz, Álvaro; García Ramos, José Enrique; Arias Carrasco, José Miguel; Lamata, Lucas; Pérez Fernández, Pedro (American Physical Society, 2022)A digital quantum simulation for the extended Agassi model is proposed using a quantum platform with eight trapped ions. The extended Agassi model is an analytically solvable model including both short range pairing and ... 
Disentangling phase transitions and critical points in the proton–neutron interacting boson model by catastrophe theory
García Ramos, José Enrique; Arias Carrasco, José Miguel; Dukelsky, J. (Elsevier, 2014)We introduce the basic concepts of catastrophe theory needed to derive analytically the phase diagram of the protonneutron interacting boson model (IBM2). Previous studies [1,2,3] were based on numerical solutions. We ... 
Excited state quantum phase transitions and chaos in the Dicke model
Pérez Fernández, Pedro; Relaño Pérez, Armando; Cejnar, P.; Arias Carrasco, José Miguel; Dukelsky, J.; García Ramos, José Enrique (American Institute of Physics, 2012)In this contribution, the critical behavior of excited state quantum phase transitions (ESQPT’s) and its relation to order and chaos in the Dicke model are studied. This model is nonintegrable. For comparison, the same ... 
Excitedstate phase transition and onset of chaos in quantum optical models
Pérez Fernández, Pedro; Relaño Pérez, Armando; Arias Carrasco, José Miguel; Cejnar, P.; Dukelsky, J.; García Ramos, José Enrique (American Physical Society, 20110415)We study critical behavior of excited states and its relation to order and chaos in the Jaynes Cummings and Dicke models of quantum optics. We show that both models exhibit a chain of excitedstate quantum phase transitions ... 
Excitedstate quantum phase transitions in a twofluid Lipkin model
García Ramos, José Enrique; Pérez Fernández, Pedro; Arias Carrasco, José Miguel (American Physical Society, 2017)[Background:] Composed systems have became of great interest in the framework of the ground state quantum phase transitions (QPTs) and many of their properties have been studied in detail. However, in these systems ... 
Excitedstate quantum phase transitions in the anharmonic LipkinMeshkovGlick model: Static aspects
Gamito, J.; KhaloufRivera, Jamil; Arias Carrasco, José Miguel; Pérez Fernández, Pedro; Pérez Bernal, Francisco (American Physical Society, 2022)The basic LipkinMeshkovGlick model displays a secondorder groundstate quantum phase transition and an excitedstate quantum phase transition (ESQPT). The inclusion of an anharmonic term in the Hamiltonian implies a ... 
Finitesize corrections in the bosonic algebraic approach to twodimensional systems
Pérez Fernández, Pedro; Arias Carrasco, José Miguel; García Ramos, José Enrique; Pérez Bernal, Francisco (American Physical Society, 20110630)Analytical results beyond the meanfieldlimit approximation for several observables of the twodimensional limit of the vibron model are presented. Finitesize scaling exponent values are also analytically derived. The ... 
Finitesize scaling exponents in the interacting boson model
Dusuel, Sébastien; Vidal, Julien; Arias Carrasco, José Miguel (American Physical Society, 20050714)We investigate the finitesize scaling exponents for the critical point at the shape phase transition from U(5) (spherical) to O(6) (deformed unstable) dynamical symmetries of the Interacting Boson Model, making use ... 
Novel results from an algebraic approach to molecular bending dynamics
Pérez Bernal, Francisco; Álvarez Bajo, Osiris; Arias Carrasco, José Miguel; Carvajal Zaera, Miguel; García Ramos, José Enrique; Larese, Danielle; Pérez Fernández, Pedro (Institute of Physics, 2011)We present a brief review of research topics of current interest that depend on an algebraic approach to molecular bending dynamics. This approach is based on a u(3) spectrum generating algebra. In particular, we briefly ...