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000851772 1001_ $$0P:(DE-HGF)0$$aGrünhaupt, Lukas$$b0
000851772 245__ $$aLoss Mechanisms and Quasiparticle Dynamics in Superconducting Microwave Resonators Made of Thin-Film Granular Aluminum
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000851772 520__ $$aSuperconducting high kinetic inductance elements constitute a valuable resource for quantum circuit design and millimeter-wave detection. Granular aluminum (grAl) in the superconducting regime is a particularly interesting material since it has already shown a kinetic inductance in the range of nH/□ and its deposition is compatible with conventional Al/AlOx/Al Josephson junction fabrication. We characterize microwave resonators fabricated from grAl with a room temperature resistivity of 4×103  μΩ cm, which is a factor of 3 below the superconductor to insulator transition, showing a kinetic inductance fraction close to unity. The measured internal quality factors are on the order of Qi=105 in the single photon regime, and we demonstrate that nonequilibrium quasiparticles (QPs) constitute the dominant loss mechanism. We extract QP relaxation times in the range of 1 s and we observe QP bursts every ∼20  s. The current level of coherence of grAl resonators makes them attractive for integration in quantum devices, while it also evidences the need to reduce the density of nonequilibrium QPs.
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000851772 7001_ $$0P:(DE-HGF)0$$aMaleeva, Nataliya$$b1
000851772 7001_ $$0P:(DE-HGF)0$$aSkacel, Sebastian T.$$b2
000851772 7001_ $$0P:(DE-HGF)0$$aCalvo, Martino$$b3
000851772 7001_ $$0P:(DE-HGF)0$$aLevy-Bertrand, Florence$$b4
000851772 7001_ $$0P:(DE-HGF)0$$aUstinov, Alexey V.$$b5
000851772 7001_ $$0P:(DE-HGF)0$$aRotzinger, Hannes$$b6
000851772 7001_ $$0P:(DE-HGF)0$$aMonfardini, Alessandro$$b7
000851772 7001_ $$0P:(DE-Juel1)151130$$aCatelani, Gianluigi$$b8
000851772 7001_ $$0P:(DE-HGF)0$$aPop, Ioan M.$$b9$$eCorresponding author
000851772 773__ $$0PERI:(DE-600)1472655-5$$a10.1103/PhysRevLett.121.117001$$gVol. 121, no. 11, p. 117001$$n11$$p117001$$tPhysical review letters$$v121$$x1079-7114$$y2018
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