Two-photon probe of the Jaynes-Cummings model and controlled symmetry breaking in circuit QED

ORAL

Abstract

Superconducting qubits behave as artificial two-level atoms. Coupling them to on-chip microwave resonators has given rise to the field of circuit quantum electrodynamics (QED). 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 controlled symmetry breaking of the system Hamiltonian, causing parity to become a not well-defined property. Our study provides deep insight into the interplay of multiphoton processes and symmetries in a qubit-resonator system. We acknowledge support from SFB631, NIM, CREST-JST, JSPS-KAKENHI (18201018), MEXT-KAKENHI (18001002), EuroSQUIP, and the Ikerbasque Foundation.

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Authors

  • Frank Deppe

    • Walther-Meissner-Institut and TU Muenchen, Germany

  • Matteo Mariantoni

    • Walther-Meissner-Institut and TU Muenchen, Germany

  • E. P. Menzel

    • Walther-Meissner-Institut and TU Muenchen, Germany

  • A. Marx

    • Walther-Meissner-Institut and TU Muenchen, Germany

  • R. Gross

    • Walther-Meissner-Institut and TU Muenchen, Germany

  • S. Saito

    • NTT Basic Research Laboratories, NTT Corp., Japan

  • K. Kakuyanagi

    • NTT Basic Research Laboratories, NTT Corp., Japan

  • H. Tanaka

    • NTT Basic Research Laboratories, NTT Corp., Japan

  • K. Semba

    • NTT Basic Research Laboratories, NTT Corp., Japan

  • T. Meno

    • NTT Advanced Technologiy, NTT Corp., Japan

  • H. Takayanagi

    • Tokyo University of Science and International Center for Materials Nanoarchitectronics, Japan

  • E. Solano

    • Universidad del Pais Vasco - Euskal Herriko Unibertsitatea, Spain