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28 March 2024
 
  » arxiv » 0805.3294

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Two-photon probe of the Jaynes-Cummings model and symmetry breaking in circuit QED
Frank Deppe ; Matteo Mariantoni ; E. P. Menzel ; A. Marx ; S. Saito ; K. Kakuyanagi ; H. Tanaka ; T. Meno ; K. Semba ; H. Takayanagi ; E. Solano ; R. Gross ;
Date 21 May 2008
AbstractSuperconducting 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.
Source arXiv, 0805.3294
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