Ultrahigh finesse Fabry-Pérot superconducting resonator
Stefan Kuhr, S. Gleyzes, Christine Guerlin, J. Bernu, Ulrich B. Hoff, S. Deléglise, S. Osnaghi, M. Brune, J. M. Raimond, S. Haroche, Emmanuel Jacques, P. Bosland, B. Visentin · Applied Physics Letters · 2007
The authors have built a microwave Fabry-Pérot resonator made of diamond-machined copper mirrors coated with superconducting niobium. Its damping time (Tc=130ms at 51GHz and 0.8K) corresponds to a finesse of 4.6×109, the highest ever reached for a Fabry-Pérot in any frequency range. This result opens many perspectives for quantum information processing, decoherence and nonlocality studies.