Browsing by Author "0000-0001-9400-2709"
Now showing items 1-20 of 55
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Analytical description of the survival probability of coherent states in regular regimes.
(American Physical Society, 2018)Using coherent states as initial states, we investigate the quantum dynamics of the Lipkin–Meshkov–Glick (LMG) and Dicke models in the semi-classical limit. They are representative models of bounded systems with one- and ... -
Calculation of transition state energies in the hcn–hnc isomerization with an algebraic model.
(American Chemical Society, 2019-10-09)Recent works have shown that the spectroscopic access to highly excited states provides enough information to characterize transition states in isomerization reactions. Here, we show that information about the transition ... -
Chaos enhancement in large-spin chains
(arXiv preprints, 2022-03-31)We study the chaotic properties of a large-spin XXZ chain with onsite disorder and a small number of excitations above the fully polarized state. We show that while the classical limit, which is reached for large spins, ... -
Comment on “Systematic Construction of Counterexamples to the Eigenstate Thermalization Hypothesis”.
(American Physical Society, 2018-07-17) -
Decay of a thermofield-double state in chaotic quantum systems.
(EDP Sciences, 2018-09)Scrambling in interacting quantum systems out of equilibrium is particularly effective in the chaotic regime. Under time evolution, initially localized information is said to be scrambled as it spreads throughout the entire ... -
Dynamical signatures of quantum chaos and relaxation time scales in a spin-boson system.
(American Physical Society, 2019-07-31)Quantum systems whose classical counterparts are chaotic typically have highly correlated eigenvalues and level statistics that coincide with those from ensembles of full random matrices. A dynamical manifestation of these ... -
Dynamical signatures of quantum chaos and relaxation timescales in a spin-boson system.
(Philip Allan Publishers Limited, 2019-05-10)Quantum systems whose classical counterparts are chaotic typically have highly correlated eigenvalues and level statistics that coincide with those from ensembles of full random matrices. A dynamical manifestation of these ... -
Dynamics at the many-body localization transition.
(American Physical Society, 2015-07)The isolated one-dimensional Heisenberg model with static random magnetic fields has become paradigmatic for the analysis of many-body localization. Here, we study the dynamics of this system initially prepared in a ... -
Entanglement in quantum computers described by the XXZ model with defects.
(American Physical Society, 2003-06)We investigate on how to generate maximally entangled states in systems characterized by the Hamiltonian of the XXZ model with defects. Some proposed quantum computers are described by such a model. Defects embedded in ... -
Entropy of Isolated Quantum Systems after a Quench.
(American Physical Society, 2011-07-18)A diagonal entropy, which depends only on the diagonal elements of the system’s density matrix in the energy representation, has been recently introduced as the proper definition of thermodynamic entropy in out-of-equilibrium ... -
Excited-state quantum phase transitions studied from a non-Hermitian perspective.
(American Physical Society, 2017-01-24)A main distinguishing feature of non-Hermitian quantum mechanics is the presence of exceptional points (EPs). They correspond to the coalescence of two energy levels and their respective eigenvectors. Here, we use the ... -
Experimental Detection of the Correlation R ́enyi Entropy in the Central Spin Model.
(2020-11)We propose and experimentally measure an entropy that quantifies the volume of correlations among qubits.The experiment is carried out on a nearly isolated quantum system composed of a central spin coupled and initially ... -
Exponentially fast dynamics in the Fock space of chaotic man y-body systems.
(arXiv.org, 2018-02-22)We demonstrate analytically and numerically that in isolated quantum systems of many interacting particles, the number of states participating in the evolution after a quench increases exponentially in time, provided the ... -
Exponentially fast dynamics of chaotic many-body systems.
(American Physical Society, 2019-01-02)We demonstrate analytically and numerically that in isolated quantum systems of many interacting particles, the number of many-body states participating in the evolution after a quench increases exponentially in time, ... -
From few- to many-body quantum systems.
(IOP Publishing, 2018-09-03)How many particles are necessary to make a quantum system many-body? To answer this question, we take as reference for the many-body limit a quantum system at half-filling and compare its properties with those of a system ... -
Generic dynamical features of quenched interacting quantum systems: Survival probability, density imbalance, and out-of-time-ordered correlator.
(American Physical Society, 2018-02-23)We study numerically and analytically the quench dynamics of isolated many-body quantum systems. Using full random matrices from the Gaussian orthogonal ensemble, we obtain analytical expressions for the evolution of the ... -
Ground-state energy distribution of disordered many-body quantum systems
(arXiv preprints, 2022-05-19)Extreme-value distributions are studied in the context of a broad range of problems, from the equilibrium properties of low-temperature disordered systems to the occurrence of natural disasters. Our focus here is on the ... -
Heating suppression by long-range interactions in periodically driven spin chains.
(arXiv preprint, 2021-05-20)We propose a mechanism to suppress heating in periodically driven many-body quantum systems by employing sufficiently long-range interactions and experimentally relevant initial conditions. The mechanism is robust to local ... -
How many particles make up a chaotic many-body quantum system?
(arXiv preprint arXiv:2012.14436, 2020-12-28)We numerically investigate the minimum number of interacting particles, which is required for the onset of strong chaos in quantum systems on a one-dimensional lattice with short-range and long-range interactions. We ... -
Identification of quantum scars via phase-space localization measures
(arXiv preprint, 2021-07-14)There is no unique way to quantify the degree of delocalization of quantum states in unbounded continuous spaces. In this work, we explore a recently introduced localization measure that quantifies the portion of the ...
