Session X26: Superconducting Qubits: Coherent Phases in Superconducting Resonators
2:30 PM–5:30 PM, Thursday, March 18, 2010
Room: D136
Sponsoring Unit:
GQI
Chair: Matthias Steffen, IBM
Abstract ID: BAPS.2010.MAR.X26.5
Abstract: X26.00005 : Selection rules for multiphoton excitations in a qubit-resonator system
3:18 PM–3:30 PM
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Abstract 
Authors:
F. Deppe
(Walther-Meissner-Institut and TU Muenchen, Garching, Germany)
T. Niemczyk
(Walther-Meissner-Institut and TU Muenchen, Garching, Germany)
M. Mariantoni
(Walther-Meissner-Institut and TU Muenchen, Garching, Germany)
E. P. Menzel
(Walther-Meissner-Institut and TU Muenchen, Garching, Germany)
E. Hoffmann
(Walther-Meissner-Institut and TU Muenchen, Garching, Germany)
M. J. Schwarz
(Walther-Meissner-Institut and TU Muenchen, Garching, Germany)
E. Schuberth
(Walther-Meissner-Institut and TU Muenchen, Garching, Germany)
A. Marx
(Walther-Meissner-Institut and TU Muenchen, Garching, Germany)
R. Gross
(Walther-Meissner-Institut and TU Muenchen, Garching, Germany)
E. Solano
(Universidad del Pais Vasco and Ikerbasque Foundation, Bilbao, Spain)
The theoretical analysis of a qubit-resonator system reveals selection rules at certain symmetry points of the qubit. In the case of a superconducting flux qubit, this symmetry of the double-well potential can be broken in a controlled way by changing the external magnetic field. Only then, odd and even multiphoton processes can coexist at the same flux bias. We illustrate this phenomenon with spectroscopy measurements of a superconducting flux qubit strongly coupled to an on-chip coplanar waveguide resonator. Our studies extend up to three-photon driving and clearly show the transition from strict selection rules to a regime of coexistent multiphoton excitations. We acknowledge support from SFB631, NIM, UPV/EHU Grant GIU07/40, and European project EuroSQIP.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2010.MAR.X26.5