Abstract:
We consider a spin-boson model describing the dephasing process in an open quantum system and obtain exact expressions for the two-time spin correlation function and the decoherence function applicable for any values of the coupling constants. We show that the initial statistical correlations between the dynamical system and the heat bath considerably affect the time dependence of the decoherence function.
Keywords:
open quantum system, dephasing in quantum systems, spin-boson model.
Citation:
V. G. Morozov, G. Röpke, “Two-time correlation functions in an exactly solvable spin-boson model”, TMF, 168:3 (2011), 482–489; Theoret. and Math. Phys., 168:3 (2011), 1271–1277
This publication is cited in the following 4 articles:
Roberto Grimaudo, Antonino Messina, Hiromichi Nakazato, Alessandro Sergi, Davide Valenti, “Characterization of Quantum and Classical Critical Points for an Integrable Two-Qubit Spin–Boson Model”, Symmetry, 15:12 (2023), 2174
Trevisan A., Smirne A., Megier N., Vacchini B., “Adapted Projection Operator Technique For the Treatment of Initial Correlations”, Phys. Rev. A, 104:5 (2021), 052215
Ignatyuk V., “Dynamic Correlations in Open Quantum Systems: the Dephasing Model”, Open Syst. Inf. Dyn., 27:2 (2020), 2050007
Calvani D., Cuccoli A., Gidopoulos N.I., Verrucchi P., “Dynamics of Open Quantum Systems Using Parametric Representation with Coherent States”, Open Syst. Inf. Dyn., 20:3 (2013), 1340002