Physics – Condensed Matter – Superconductivity
Scientific paper
2008-05-21
Nature Physics 4, pp686-691 (2008)
Physics
Condensed Matter
Superconductivity
Accepted for publication in Nature Physics, 8 pages, 4 figures
Scientific paper
10.1038/nphys1016
Superconducting qubits behave as artificial two-level atoms and are used to investigate fundamental quantum phenomena. In this context, the study of multi-photon excitations occupies a central role. Moreover, coupling superconducting qubits to on-chip microwave resonators has given rise to the field of circuit QED. In contrast to quantum-optical cavity QED, circuit QED offers the tunability inherent to solid-state circuits. In this work, we report on the observation of key signatures of a two-photon driven Jaynes-Cummings model, which unveils the upconversion dynamics of a superconducting flux qubit coupled to an on-chip resonator. Our experiment and theoretical analysis show clear evidence for the coexistence of one- and two-photon driven level anticrossings of the qubit-resonator system. This results from the symmetry breaking of the system Hamiltonian, when parity becomes a not well-defined property. Our study provides deep insight into the interplay of multiphoton processes and symmetries in a qubit-resonator system.
Deppe Frank
Gross Ralf
Kakuyanagi Kosuke
Mariantoni Matteo
Marx Achim
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