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Josephson tunnel junction coupled to superconducting thin-film resonator

A. Larsen, Hans Dalsgaard Jensen, J. Mygind

Physica B Condensed MatterAug 1, 19907 citations

Slow noise processes in superconducting resonators

Y. Harada

The Japan Society of Applied PhysicsFeb 13, 20130 citations

Ultra-high-Q resonators for low-noise, microwave signal generation using sapphire buffer layers and superconducting thin films

F Abbas, L.E. Davis, John C. Gallop

An analysis has been completed to provide guidelines for producing planar microwave resonators with Q-factors of the order of 10 6 -10 8 at a temperature of 4 K and a frequency of 1-20 GHz using high-T c superconducting thin films on sapphire shielded by suitable buffer layers. Buffer layers not only overcome the problems of film-substrate interactions and reduction of microcracks, but can also confine the field into the sapphire which enhances the Q r and Q c of the resonator.

Superconductor Science and TechnologyJul 1, 19946 citations

Movable Thin-Film Superconducting Resonator Coupled to a Tapered Optical Microfiber at 15 mK

Kristen Voigt, Jared Hertzberg, Jennifer E. Hoffman +10 more

We have coupled a tapered optical microfiber to a translatable thin-film lumped-element superconducting Al microwave resonator that is cooled to 15 mK. The thin-film resonator has a resonance frequency of 6.14 GHz, a quality factor of Q = 2.59 × 105, and is mounted inside a 3-D Al microwave cavity that provides a well-isolated electromagnetic environment. The microfiber is held fixed while the cavity is mounted on an x-z translation stage that allows the lumped-element resonator and the optical fiber to be brought close to each other (less than 1 mm). When 780-nm light is sent through the fiber, Rayleigh scattering in the fiber causes a weak position-dependent nonuniform illumination of the thin-film resonator, exciting quasiparticles in the superconducting film and thereby affecting its resonance frequency foand Q. We report on the response of the resonator to both the scattered optical power and the presence of the fiber's dielectric, as the thin-film resonator is moved in situ with respect to the fiber.We have coupled a tapered optical microfiber to a translatable thin-film lumped-element superconducting Al microwave resonator that is cooled to 15 mK. The thin-film resonator has a resonance frequency of 6.14 GHz, a quality factor of Q = 2.59 × 105, and is mounted inside a 3-D Al microwave cavity that provides a well-isolated electromagnetic environment. The microfiber is held fixed while the cavity is mounted on an x-z translation stage that allows the lumped-element resonator and the optical fiber to be brought close to each other (less than 1 mm). When 780-nm light is sent through the fiber, Rayleigh scattering in the fiber causes a weak position-dependent nonuniform illumination of the thin-film resonator, exciting quasiparticles in the superconducting film and thereby affecting its resonance frequency foand Q. We report on the response of the resonator to both the scattered optical power and the presence of the fiber's dielectric, as the thin-film resonator is moved in situ with respect to the fiber.

IEEE Transactions on Applied SuperconductivityDec 10, 20144 citations

Noise from Two-Level Systems in Superconducting Resonators

C. Neill, R. Barends, Y. Chen +13 more

Bulletin of the American Physical SocietyMar 18, 20130 citations

High kinetic inductance NbTiN superconducting transmission line resonators in the very thin film limit

Terence Bretz-Sullivan, Rupert Lewis, Ana L. Lima-Sharma +6 more

We examine the DC and radio frequency (RF) response of superconducting transmission line resonators comprised of very thin NbTiN films, <12 nm in thickness, in the high-temperature limit, where the photon energy is less than the thermal energy. The resonant frequencies of these superconducting resonators show a significant nonlinear response as a function of RF input power, which can approach a frequency shift of Δf=−0.15% in a −20 dB span in the thinnest film. The strong nonlinear response allows these very thin film resonators to serve as high kinetic inductance parametric amplifiers.We examine the DC and radio frequency (RF) response of superconducting transmission line resonators comprised of very thin NbTiN films, <12 nm in thickness, in the high-temperature limit, where the photon energy is less than the thermal energy. The resonant frequencies of these superconducting resonators show a significant nonlinear response as a function of RF input power, which can approach a frequency shift of Δf=−0.15% in a −20 dB span in the thinnest film. The strong nonlinear response allows these very thin film resonators to serve as high kinetic inductance parametric amplifiers.

Applied Physics LettersAug 1, 202219 citations

Frequency Noise in Superconducting Thin-Film Resonators

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