Letter abstract
Nature Physics 4, 686 - 691 (2008)
Published online: 29 June 2008 | doi:10.1038/nphys1016
Two-photon probe of the Jaynes–Cummings model and controlled symmetry breaking in circuit QED
Frank Deppe1,2,8, Matteo Mariantoni1,8, E. P. Menzel1, A. Marx1, S. Saito2, K. Kakuyanagi2, H. Tanaka2, T. Meno3, K. Semba2, H. Takayanagi4,5, E. Solano6,7 & R. Gross1
Superconducting qubits1, 2 behave as artificial two-level atoms and are used to investigate fundamental quantum phenomena. In this context, the study of multiphoton excitations3, 4, 5, 6, 7 occupies an important role. Moreover, coupling superconducting qubits to onchip microwave resonators has given rise to the field of circuit quantum electrodynamics8, 9, 10, 11, 12, 13, 14, 15 (QED). In contrast to quantum-optical cavity QED (refs 16, 17, 18, 19), circuit QED offers the tunability inherent to solid-state circuits. Here, 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 qubit20 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 property21. Our study provides fundamental insight into the interplay of multiphoton processes and symmetries in a qubit–resonator system.
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Walther-Mei
ner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meiner-Str. 8, D-85748 Garching, Germany
- NTT Basic Research Laboratories, NTT Corporation, Kanagawa, 243-0198, Japan
- NTT Advanced Technology, NTT Corporation, Kanagawa, 243-0198, Japan
- Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo, 162-8601, Japan
- International Center for Materials Nanoarchitectronics, NIMS, Tsukuba 305-0003, Japan
- Physics Department, ASC and CeNS, Ludwig-Maximilians-Universität, Theresienstr. 37, 80333 München, Germany
- Departamento de Química Física, Universidad del País Vasco - Euskal Herriko Unibertsitatea, Apdo. 644, 48080 Bilbao, Spain
- These authors contributed equally to this work
Correspondence to: Frank Deppe1,2,8 e-mail: frank.deppe@wmi.badw-muenchen.de
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