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Thermal power of heat flow through a qubit
KTH, School of Electrical Engineering and Computer Science (EECS), Computational Science and Technology (CST).
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
2019 (English)In: Physical review. E, ISSN 2470-0045, E-ISSN 2470-0053, Vol. 99, no 4, article id 042130Article in journal (Refereed) Published
Abstract [en]

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 sigma(z). 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.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 99, no 4, article id 042130
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-251478DOI: 10.1103/PhysRevE.99.042130ISI: 000465178600005Scopus ID: 2-s2.0-85064857166OAI: oai:DiVA.org:kth-251478DiVA, id: diva2:1317352
Note

QC 20190522

Available from: 2019-05-22 Created: 2019-05-22 Last updated: 2019-05-22Bibliographically approved

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Aurell, Erik

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