Observation of the Bloch-Siegert shift in a driven quantum-to-classical transition

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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2017-07-07
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Language
en
Pages
1-5
Series
Physical Review B, Volume 96, issue 2
Abstract
We show that the counter-rotating terms of the dispersive qubit-cavity Rabi model can produce relatively large and nonmonotonic Bloch-Siegert shifts in the cavity frequency as the system is driven through a quantum-to-classical transition. Using a weak microwave probe tone, we demonstrate experimentally this effect by monitoring the resonance frequency of a microwave cavity coupled to a transmon and driven by a microwave field with varying power. In the weakly driven regime (quantum phase), the Bloch-Siegert shift appears as a small constant frequency shift, while for a strong drive (classical phase) it presents an oscillatory behavior as a function of the number of photons in the cavity. The experimental results are in agreement with numerical simulations based on the quasienergy spectrum.
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Pietikäinen , I , Danilin , S , Sampath Kumar , K , Vepsäläinen , A , Golubev , D S , Tuorila , J & Paraoanu , G S 2017 , ' Observation of the Bloch-Siegert shift in a driven quantum-to-classical transition ' , Physical Review B , vol. 96 , no. 2 , 020501 , pp. 1-5 . https://doi.org/10.1103/PhysRevB.96.020501