Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 13: Focussed Session: Superconducting Quantum Circuits

TT 13.2: Topical Talk

Dienstag, 24. März 2009, 10:00–10:30, HSZ 03

Two-photon probe of the Jaynes-Cummings model and controlled symmetry breaking in circuit QEDFrank Deppe1, Matteo Mariantoni1, Edwin P. Menzel1, •Achim Marx1, Rudolf Gross1, S. Saito2, K. Kakuyanagi2, H. Tanaka2, K. Semba2, T Meno3, H. Takayanagi4, and E. Solano51Walther-Meissner-Institut and TU München, Germany — 2NTT Basic Research Laboratories, NTT Corp., Japan — 3NTT Advanced Technology, NTT Corp., Japan — 4Tokyo University of Science and International Center for Materials Nanoarchitectronics, Japan — 5Universidad del País Vasco - Euskal Herriko Unibertsitatea, Spain

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. 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 ackowledge support from SFB 631, NIM, CREST-JST, JSPS-KAKENHI(18201018) and MEXT-KAKENHI(18001002), EuroSQIP, and the Ikerbasque Foundation.

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