Regensburg 2010 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 23: TR: Quantum Coherence and Quantum Information Systems 2
TT 23.10: Talk
Wednesday, March 24, 2010, 16:45–17:00, H18
Josephson current and quantum cavity modes — Jakob Hammer1 and •Marco Aprili2 — 1Universität Regensburg, Germany — 2Laboratoire de Physique des Solides, France
Extended Josephson junctions support resonant quantum cavity modes in the weak link. We succeeded to excite selected modes in a controlled manner and to detect this excitations as modifications of the Fraunhofer interference pattern of the junction. Furthermore very small numbers of thermally excited photons are reflected in the shape of the switching current histogram. In addition we observed an increase of the Josephson critical current when the microwave frequency is slightly detuned from the cavity mode resonance. This effect is consistant with cavity induced phase cooling.