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arxiv: 1107.0810 · v1 · submitted 2011-07-05 · ❄️ cond-mat.mes-hall · cond-mat.supr-con· quant-ph

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Selection rules in a strongly coupled qubit-resonator system

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classification ❄️ cond-mat.mes-hall cond-mat.supr-conquant-ph
keywords two-photonrulesselectionartificialcontrolledcouplingone-qubit-resonator
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Superconducting qubits acting as artificial two-level atoms allow for controlled variation of the symmetry properties which govern the selection rules for single and multiphoton excitation. We spectroscopically analyze a superconducting qubit-resonator system in the strong coupling regime under one- and two-photon driving. Our results provide clear experimental evidence for the controlled transition from an operating point governed by dipolar selection rules to a regime where one- and two-photon excitations of the artificial atom coexist. We find that the vacuum coupling between qubit and resonator can be straightforwardly extracted from the two-photon spectra where the detuned two-photon drive does not populate the relevant resonator mode significantly.

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