277 citations · 869 across the 26 of their papers we have counts for
26 papers
Work and efficiency fluctuations in a quantum Otto cycle with idle levels
Maron F. Anka, Thiago R. de Oliveira, Daniel Jonathan
We study the performance of a quantum Otto heat engine with two spins coupled by a Heisenberg interaction, taking into account not only the mean values of work and efficiency but a…
Smooth Crossover Between Weak and Strong Thermalization using Rigorous Bounds on Equilibration of Isolated Systems
Luis Fernando dos Prazeres, Thiago R. de Oliveira
It is usually expected and observed that non-integrable isolated quantum systems thermalize. However, for some non-integrable spin chain models, in a numerical study, initial state…
Canonical typicality under general quantum channels
Pedro S. Correia, Gabriel Dias Carvalho, Thiago R. de Oliveira +2
With the control of ever more complex quantum systems becoming a reality, new scenarios are emerging where generalizations of the most foundational aspects of statistical quantum m…
Equilibration of Isolated Systems: investigating the role of coarse-graining on the initial state magnetization
Gabriel Dias Carvalho, Luis Fernando dos Prazeres, Pedro Silva Correia +1
Many theoretical and experimental results show that even isolated quantum systems evolving unitarily may equilibrate, since the evolution of some observables may be around an equil…
Quantum Stirling engine based on dinuclear metal complexes
Clebson Cruz, Hamid-Reza Rastegar-Sedehi, Maron F. Anka +2
Low-dimensional metal complexes are versatile materials with tunable physical and chemical properties that make these systems promising platforms for caloric applications. In this…
Optical computing of quantum revivals
Mayanne R. Maia, Daniel Jonathan, Thiago R. Oliveira +2
Interference is the mechanism through which waves can be structured into the most fascinating patterns. While for sensing, imaging, trapping, or in fundamental investigations, stru…
Nonadiabatic coupled-qubit Otto cycle with bidirectional operation and efficiency gains
Cleverson Cherubim, Thiago R. de Oliveira, Daniel Jonathan
We study a quantum Otto cycle that uses a 2-qubit working substance whose Hamiltonian does not commute with itself at different times during unitary strokes. We investigate how the…
Relative purity, speed of fluctuations, and bounds on equilibration times
Diego Paiva Pires, Thiago R. de Oliveira
We discuss the local equilibration of closed systems using the relative purity, a paradigmatic information-theoretic distinguishability measure that finds applications ranging from…
Measurement-based quantum heat engine in a multilevel system
Maron F. Anka, Thiago R. de Oliveira, Daniel Jonathan
We compare quantum Otto engines based on two different cycle models: a two-bath model, with a standard heat source and sink, and a measurement-based protocol, where the role of hea…
Efficiency gain and bidirectional operation of quantum engines with decoupled internal levels
Thiago R. de Oliveira, Daniel Jonathan
We present a mechanism for efficiency increase in quantum heat engines containing internal energy levels that do not couple to the external work sink. The gain is achieved by using…
Violation of the Bell inequality in quantum critical random spin- chains
João C. Getelina, Thiago R. de Oliveira, José A. Hoyos
We investigate the entanglement and nonlocality properties of two random XX spin-1/2 critical chains, in order to better understand the role of breaking translational invariance to…
The Unruh Quantum Otto Engine
Enrique Arias, Thiago R. de Oliveira, M. S. Sarandy
We introduce a quantum heat engine performing an Otto cycle by using the thermal properties of the quantum vacuum. Since Hawking and Unruh, it has been established that the vacuum…
Force and torque of a string on a pulley
Thiago R. de Oliveira, Nivaldo A. Lemos
Every university introductory physics course considers the problem of Atwood's machine taking into account the mass of the pulley. In the usual treatment the tensions at the two en…
Equilibration time scales in closed many-body quantum systems
Thiago R. de Oliveira, Christos Charalambous, Daniel Jonathan +2
We show that the physical mechanism for the equilibration of closed quantum systems is dephasing, and identify the energy scales that determine the equilibration timescale of a giv…
Overcoming ambiguities in classical and quantum correlation measures
F. M. Paula, A. Saguia, Thiago R. de Oliveira +1
We identify ambiguities in the available frameworks for defining quantum, classical, and total correlations as measured by discordlike quantifiers. More specifically, we determine…
Maxwell's demons in multipartite quantum correlated systems
Helena C. Braga, Clodoaldo C. Rulli, Thiago R. de Oliveira +1
We investigate the extraction of thermodynamic work by a Maxwell's demon in a multipartite quantum correlated system. We begin by adopting the standard model of a Maxwell's demon a…
Effects of spontaneous symmetry break in the origin of non-analytic behavior of entanglement at quantum phase transitions
L. Justino, Thiago R. de Oliveira
We present an example where Spontaneous Symmetry Breaking may effect not only the behavior of the entanglement at Quantum Phase Transitions, but also the origin of the non-analytic…
Geometric classical and total correlations via trace distance
F. M. Paula, J. D. Montealegre, A. Saguia +2
We introduce the concepts of geometric classical and total correlations through Schatten 1-norm (trace norm), which is the only Schatten p-norm able to ensure a well-defined geomet…
Geometric quantum discord through the Schatten 1-norm
F. M. Paula, Thiago. R. de Oliveira, M. S. Sarandy
It has recently been pointed out that the geometric quantum discord, as defined by the Hilbert-Schmidt norm (2-norm), is not a good measure of quantum correlations, since it may in…
Generalized quantum microcanonical ensemble from random matrix product states
Silvano Garnerone, Thiago R. de Oliveira
We propose a tensor network algorithm for the efficient sampling of quantum pure states belonging to a generalized microcanonical ensemble. The algorithm consists in an adaptation…
Nonviolation of Bell's Inequality in Translation Invariant Systems
Thiago R. de Oliveira, A. Saguia, M. S. Sarandy
The nature of quantum correlations in strongly correlated systems has been a subject of intense research. In particular, it has been realized that entanglement and quantum discord…
Quantum discord in the ground state of spin chains
Marcelo S. Sarandy, Thiago R. de Oliveira, Luigi Amico
The ground state of a quantum spin chain is a natural playground for investigating correlations. Nevertheless, not all correlations are genuinely of quantum nature. Here we review…
Bell inequalities and entanglement at quantum phase transition in the XXZ Model
L. Justino, Thiago R. de Oliveira
Entanglement and violation of Bell inequalities are aspects of quantum nonlocality that have been often confused in the past. It is now known that this equivalence is only true for…
Witnessing nonclassical multipartite states
A. Saguia, C. C. Rulli, Thiago R. de Oliveira +1
We investigate a witness for nonclassical multipartite states based on their disturbance under local measurements. The witness operator provides a sufficient condition for nonclass…