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Title: Quantum thermometry using the ac Stark shift within the Rabi model
Authors: Higgins, K.D.B.
Lovett, B.W.
Gauger, E.M. 
Issue Date: 7-Oct-2013
Citation: Higgins, K.D.B., Lovett, B.W., Gauger, E.M. (2013-10-07). Quantum thermometry using the ac Stark shift within the Rabi model. Physical Review B - Condensed Matter and Materials Physics 88 (15) : -. ScholarBank@NUS Repository.
Abstract: A 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. © 2013 American Physical Society.
Source Title: Physical Review B - Condensed Matter and Materials Physics
ISSN: 10980121
DOI: 10.1103/PhysRevB.88.155409
Appears in Collections:Staff Publications

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