Thermal power of heat flow through a qubit

Erik Aurell, Federica Montana

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
126 Downloads (Pure)


In this paper we consider the thermal power of a heat flow through a qubit between two baths. The baths are modeled as a set of harmonic oscillators initially at equilibrium, at two temperatures. Heat is defined as the change of energy of the cold bath, and thermal power is defined as expected heat per unit time, in the long-time limit. The qubit and the baths interact as in the spin-boson model, i.e., through qubit operator σz. We compute thermal power in an approximation analogous to a "noninteracting blip" (NIBA) and express it in the polaron picture as products of correlation functions of the two baths, and a time derivative of a correlation function of the cold bath. In the limit of weak interaction we recover known results in terms of a sum of correlation functions of the two baths, a correlation functions of the cold bath only, and the energy split.

Original languageEnglish
Article number042130
Pages (from-to)1-14
JournalPhysical Review E
Issue number4
Publication statusPublished - 19 Apr 2019
MoE publication typeA1 Journal article-refereed

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