Bath dynamics in an exactly solvable qubit model with initial qubit-environment correlations

Autor:	Ignatyuk, V. V., Morozov, V. G.
Rok vydání:	2013
Předmět:	Condensed Matter - Statistical Mechanics Quantum Physics
Zdroj:	Condens. Matter Phys., 2013, vol. 16, No. 3, 34001
Druh dokumentu:	Working Paper
DOI:	10.5488/CMP.16.34001
Popis:	We study the bath dynamics in the dephasing model of a two-state quantum system (qubit) coupled to an environment of harmonic oscillators. This model was shown [Morozov et al., Phys. Rev. A, 2012, 85, 022101] to admit the analytic solution for the qubit and environment dynamics. Using this solution, we derive the exact expression for the bath reduced density matrix in the presence of initial qubit-environment correlations. We obtain the non-equilibrium phonon distribution function and discuss in detail the time behavior of the bath energy. It is shown that only the inclusion of dynamic correlations between the qubit and the bath ensures the proper time behavior of the quantity which may be interpreted as the "environment energy". Comment: 6 pages
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1310.1236 Zobrazit plný text záznamu View this record from Arxiv