Regensburg 2010 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 23: TR: Quantum Coherence and Quantum Information Systems 2
TT 23.7: Vortrag
Mittwoch, 24. März 2010, 16:00–16:15, H18
Selection rules for multiphoton excitations in a qubit-resonator system — Thomas Niemczyk1, •Frank Deppe1,2, Hans Huebl1, Edwin Menzel1, Fredrik Hocke1, Elisabeth Hoffmann1,2, Manuel Schwarz1, Achim Marx1, and Rudolf Gross1,2 — 1Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — 2Physik Department E23, Technische Universität München, 85748 Garching, Germany
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 onchip 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.
Financial support via SFB631 and the Excellence Initative via NIM is gratefully acknowledged.