10 citations · 25 across the 11 of their papers we have counts for
11 papers
Entropy-based analysis of single-qubit Otto and Carnot heat engines
Andrés Vallejo, Catty Lissardy, Santiago Silva-Gallo +2
From an entropy-based formulation of the first law of thermodynamics in the quantum regime, we investigate the performance of Otto-like and Carnot-like engines for a single-qubit w…
Evolution of expected values in open quantum systems
Andrés Vallejo, Alejandro Romanelli, Virginia Feldman +1
We derive a generalization of Ehrenfest theorem valid for open quantum systems. From this result, we identify three contributions to the evolution of expected values: i) the explic…
Irreversibility of sudden processes: Compression versus expansion in perfect gases
Andrés Vallejo, Matías Osorio
We focus on the study of the processes undergone by a perfect gas when the external pressure is suddenly modified. The analysis shows that, from the second law perspective, there i…
Finding and improving bounds of real functions by thermodynamic arguments
Andrés Vallejo
The possibility of stating the second law of thermodynamics in terms of the increasing behaviour of a physical property establishes a connection between that branch of physics and…
Propagation of radical ideas in societies with memory: competition between radical strength and social cohesion
Andres Vallejo, Arturo C. Marti
Based on a dynamical model with fractional derivatives we show that the evolution of radical groups in a society with a memory depends mainly on the active proselytism of radical g…
Qubit thermodynamics far from equilibrium: two perspectives about the nature of heat and work in the quantum regime
Andrés Vallejo, Alejandro Romanelli, Raúl Donangelo
Considering an entropy-based division of energy transferred into heat and work, we develop an alternative theoretical framework for the thermodynamic analysis of two-level systems.…
Temperature of a finite-dimensional quantum system
Andrés Vallejo, Alejandro Romanelli, Raúl Donángelo
A general expression for the temperature of a finite-dimensional quantum system is deduced from thermodynamic arguments. At equilibrium, this magnitude coincides with the standard…
Entropy production in the quantum walk
Andrés Vallejo, Alejandro Romanelli, Raúl Donangelo +1
We explore the notion of generated entropy in open quantum systems. We focus on the study of the discrete-time quantum walk on the line, from the entropy production perspective. We…
Out-of-equilibrium quantum thermodynamics in the Bloch sphere: temperature and internal entropy production
Andrés Vallejo, Alejandro Romanelli, Raúl Donangelo
An explicit expression for the temperature of an open two-level quantum system is obtained as a function of local properties, under the hypothesis of weak interaction with the envi…
Initial-state-dependent thermalization in open qubits
Andrés Vallejo, Alejandro Romanelli, Raul Donangelo
We study, from a thermodynamic perspective, the equilibrium states of a qubit interacting with an arbitrary environment of dimension N>>2. We show that even in presence of memory a…
Relation between the usual and the entanglement temperature, in a simple quantum system
Alejandro Romanelli, Raul Donangelo, Andrés Vallejo
We develop a thermodynamical theory to describe the behavior of the entanglement between a single two-level atom with a single mode of the electromagnetic field. The resonant Jayne…