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dc.contributor.authorHiggins, Kieran D. B.
dc.contributor.authorLovett, Brendon William
dc.contributor.authorGauger, Erik M.
dc.identifier.citationHiggins , K D B , Lovett , B W & Gauger , E M 2013 , ' Quantum thermometry using the ac Stark shift within the Rabi model ' , Physical Review. B, Condensed matter and materials physics , vol. 88 , no. 15 , 155409 .
dc.identifier.otherORCID: /0000-0001-5142-9585/work/47136588
dc.descriptionThis work was supported by the EPSRC, the National Research Foundation and Ministry of Education, Singapore, and the Royal Society.en
dc.description.abstractA quantum two-level system coupled to a harmonic oscillator represents a ubiquitous physical system. New experiments in circuit QED and nanoelectromechanical systems (NEMS) achieve unprecedented coupling strength at large detuning between qubit and oscillator, thus requiring a theoretical treatment beyond the Jaynes-Cummings model. Here we present a new method for describing the qubit dynamics in this regime, based on an oscillator correlation function expansion of a non-Markovian master equation in the polaron frame. Our technique yields a new numerical method as well as a succinct approximate expression for the qubit dynamics. These expressions are valid in the experimentally interesting regime of strong coupling at low temperature. We obtain a new expression for the ac Stark shift and show that this enables practical and precise qubit thermometry of an oscillator.
dc.relation.ispartofPhysical Review. B, Condensed matter and materials physicsen
dc.titleQuantum thermometry using the ac Stark shift within the Rabi modelen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. Condensed Matter Physicsen
dc.description.statusPeer revieweden

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