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Calzetta, E.; Roura, A.; Verdaguer, E. "Stochastic description for open quantum systems" (2003) Physica A: Statistical Mechanics and its Applications. 319:188-212
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Abstract:

A linear quantum Brownian motion model with a general spectral density function is considered. In the framework of the influence functional formalism, a Langevin equation can be introduced to describe the system's fully quantum properties even beyond the semiclassical regime. In particular, we show that the reduced Wigner function for the system can be formally written as a double average over both the initial conditions and the stochastic source of the Langevin equation. This is exploited to provide a derivation of the master equation for the reduced density matrix alternative to those existing in the literature. Furthermore, we prove that all the correlation functions obtained in the context of the stochastic description associated to the Langevin equation actually correspond to quantum correlation functions for system observables. In doing so, we also compute the closed time path generating functional of the open system. © 2002 Elsevier Science B.V. All rights reserved.

Registro:

Documento: Artículo
Título:Stochastic description for open quantum systems
Autor:Calzetta, E.; Roura, A.; Verdaguer, E.
Filiación:Departamento de Física, Universidad de Buenos Aires, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Dept. de Física Fonamental, Universitat de Barcelona, Av. Diagonal 647, 08028 Barcelona, Spain
Palabras clave:Langevin equation; Open quantum systems; Quantum Brownian motion; Correlation methods; Initial value problems; Matrix algebra; Probability density function; Quantum theory; Random processes; Spectral density functions; Brownian movement
Año:2003
Volumen:319
Página de inicio:188
Página de fin:212
DOI: http://dx.doi.org/10.1016/S0378-4371(02)01521-2
Título revista:Physica A: Statistical Mechanics and its Applications
Título revista abreviado:Phys A Stat Mech Appl
ISSN:03784371
CODEN:PHYAD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03784371_v319_n_p188_Calzetta

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Citas:

---------- APA ----------
Calzetta, E., Roura, A. & Verdaguer, E. (2003) . Stochastic description for open quantum systems. Physica A: Statistical Mechanics and its Applications, 319, 188-212.
http://dx.doi.org/10.1016/S0378-4371(02)01521-2
---------- CHICAGO ----------
Calzetta, E., Roura, A., Verdaguer, E. "Stochastic description for open quantum systems" . Physica A: Statistical Mechanics and its Applications 319 (2003) : 188-212.
http://dx.doi.org/10.1016/S0378-4371(02)01521-2
---------- MLA ----------
Calzetta, E., Roura, A., Verdaguer, E. "Stochastic description for open quantum systems" . Physica A: Statistical Mechanics and its Applications, vol. 319, 2003, pp. 188-212.
http://dx.doi.org/10.1016/S0378-4371(02)01521-2
---------- VANCOUVER ----------
Calzetta, E., Roura, A., Verdaguer, E. Stochastic description for open quantum systems. Phys A Stat Mech Appl. 2003;319:188-212.
http://dx.doi.org/10.1016/S0378-4371(02)01521-2