Observation of the Bloch-Siegert shift in a driven quantum-to-classical transition
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2017-07-07
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en
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1-5
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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.Description
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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
