Decoherence, Autler-Townes effect, and dark states in two-tone driving of a three-level superconducting system

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2011
Major/Subject
Mcode
Degree programme
Language
en
Pages
104527/1-17
Series
Physical Review B, Volume 84, Issue 10
Abstract
We present a detailed theoretical analysis of a multilevel quantum system coupled to two radiation fields and subject to decoherence. We concentrate on an effect known from quantum optics as Autler-Townes splitting, which has been recently demonstrated experimentally [M. A. Sillanpää et al., Phys. Rev. Lett. 103, 193601 (2009)] in a superconducting phase qubit. In the three-level approximation, we derive analytical solutions and describe how they can be used to extract the decoherence rates and to account for the measurement data. Better agreement with the experiment can be obtained by extending this model to five levels. Finally, we investigate the stationary states created in the experiment and show that their structure is close to that of dark states.
Description
Keywords
multilevel quantum systems, radiation fields, Autler-Townes splitting, superconducting qubits
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Citation
Li, Jian & Paraoanu, G. S. & Cicak, Katarina & Altomare, Fabio & Park, Jae I. & Simmonds, Raymond W. & Sillanpää, Mika A. & Hakonen, Pertti J. 2011. Decoherence, Autler-Townes effect, and dark states in two-tone driving of a three-level superconducting system. Physical Review B. Volume 84, Issue 10. 104527/1-17. ISSN 1098-0121 (printed). DOI: 10.1103/physrevb.84.104527.