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5 papers · 2 filters
Decoherence for classically chaotic quantum maps
Pablo Bianucci, Juan Pablo Paz, Marcos Saraceno
We study the behavior of an open quantum system, with an --dimensional space of states, whose density matrix evolves according to a non--unitary map defined in two steps: A unit…
Discrete Wigner functions and the phase space representation of quantum computers
Pablo Bianucci, Cesar Miquel, Juan Pablo Paz +1
We show how to represent the state and the evolution of a quantum computer (or any system with an --dimensional Hilbert space) in phase space. For this purpose we use a discrete…
Decoherence in a classically chaotic quantum system: entropy production and quantum--classical correspondence
Diana Monteoliva, Juan Pablo Paz
We study the decoherence process for an open quantum system which is classically chaotic (a quartic double well with harmonic driving coupled to a sea of harmonic oscillators). We…
A general mathematical structure for the time-reversal operator
Mario Alberto Castagnino, Adolfo Ramon Ordoniez, Daniela Beatriz Emmanuele
The aim of this work is the mathematical analysis of the physical time-reversal operator and its definition as a geometrical structure\QTR{bf}{, }in such a way that it could be gen…
Quantum effects after decoherence in a quenched phase transition
Nuno D. Antunes, Fernando C. Lombardo, Diana Monteoliva
We study a quantum mechanical toy model that mimics some features of a quenched phase transition. Both by virtue of a time-dependent Hamiltonian or by changing the temperature of t…