Ultrahigh finesse Fabry-Perot superconducting resonator

Stefan Kuhr , S\'ebastien Gleyzes (LKB - Lhomond) , Christine Guerlin (LKB - Lhomond) , Julien Bernu (LKB - Lhomond) , Ulrich Busk Hoff (LKB - Lhomond) , Samuel Del\'eglise (LKB - Lhomond) , Stefano Osnaghi (LKB - Lhomond) , Michel Brune (LKB - Lhomond)

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Jean-Michel Raimond (LKB - Lhomond) Serge Haroche (LKB - Lhomond) E. Jacques (DAPNIA) P. Bosland (DAPNIA) B. Visentin (DAPNIA)

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classification 🪐 quant-ph

keywords fabry-perotresonatorsuperconductingbuiltcoatedcoppercorrespondsdamping

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We have built a microwave Fabry-Perot resonator made of diamond-machined copper mirrors coated with superconducting niobium. Its damping time (Tc = 130 ms at 51 GHz and 0.8 K) corresponds to a ﬁnesse of 4.6 x 109, the highest ever reached for a Fabry-Perot in any frequency range. This result opens novel perspectives for quantum information, decoherence and non-locality studies.

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Ultrahigh finesse Fabry-Perot superconducting resonator

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