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Anomalous Temperature Dependence of the Quality Factor in a Superconducting Coplanar Waveguide Resonator

周品嘉, 王轶文, 韦联福

Chinese Physics LettersJan 1, 20140 citations

Magnetic Field Effects on High Quality Factor Superconducting Coplanar Resonators

A. Megrant, Charles Neill, R. Barends +15 more

Bulletin of the American Physical SocietyMar 18, 20130 citations

TiN superconducting coplanar waveguide resonators with single-photon quality factors of 1.5 million

Greg Calusine, Danna Rosenberg, David J. Hover +6 more

Bulletin of the American Physical SocietyMar 16, 20160 citations

Improving quality factors of superconducting coplanar wave guide resonators by surface passivation with self-assembled monolayer

Mohammed Al Ghadeer, Ahmed Hajr, Archan Banerjee +5 more

Bulletin of the American Physical SocietyMar 16, 20210 citations

Loss Dependence on Geometry and Applied Power in Superconducting Coplanar Resonators

Moe S. Khalil, F. C. Wellstood, Kevin D. Osborn

The loss in superconducting microwave resonators at low-photon numbers and low temperatures is not well understood but has implications for achievable coherence times in superconducting qubits. We have fabricated single-layer resonators with a high quality factor by patterning a superconducting aluminum film on a sapphire substrate. Four resonator geometries were studied with resonant frequencies ranging from 5 to 7 GHz: a quasi-lumped element resonator, a coplanar strip waveguide resonator, and two hybrid designs that contain both a coplanar strip and a quasi-lumped element. Transmitted power measurements were taken at 30 mK as a function of frequency and probe power. We find that the resonator loss, expressed as the inverse of the internal quality factor, decreases slowly over four decades of photon number in a manner not merely explained by loss from a conventional uniform spatial distribution of two-level systems in an oxide layer on the superconducting surfaces of the resonator.The loss in superconducting microwave resonators at low-photon numbers and low temperatures is not well understood but has implications for achievable coherence times in superconducting qubits. We have fabricated single-layer resonators with a high quality factor by patterning a superconducting aluminum film on a sapphire substrate. Four resonator geometries were studied with resonant frequencies ranging from 5 to 7 GHz: a quasi-lumped element resonator, a coplanar strip waveguide resonator, and two hybrid designs that contain both a coplanar strip and a quasi-lumped element. Transmitted power measurements were taken at 30 mK as a function of frequency and probe power. We find that the resonator loss, expressed as the inverse of the internal quality factor, decreases slowly over four decades of photon number in a manner not merely explained by loss from a conventional uniform spatial distribution of two-level systems in an oxide layer on the superconducting surfaces of the resonator.

arXiv:1008.2929IEEE Transactions on Applied SuperconductivityDec 9, 201069 citations

Study of loss in superconducting coplanar waveguide resonators

Jeremy Sage, Vladimir Bolkhovsky, William D. Oliver +2 more

Superconducting coplanar waveguide (SCPW) resonators have a wide range of applications due to the combination of their planar geometry and high quality factors relative to normal metals. However, their performance is sensitive to both the details of their geometry and the materials and processes that are used in their fabrication. In this paper, we study the dependence of SCPW resonator performance on materials and geometry as a function of temperature and excitation power. We measure quality factors greater than 2 × 106 at high excitation power and 6 × 105 at a power comparable to that generated by a single microwave photon circulating in the resonator. We examine the limits to the high excitation power performance of the resonators and find it to be consistent with a model of radiation loss. We further observe that while in all cases the quality factors are degraded as the temperature and power are reduced due to dielectric loss, the size of this effect is dependent on resonator materials and geometry. Finally, we demonstrate that the dielectric loss can be controlled in principle using a separate excitation near the resonance frequencies of the resonator.Superconducting coplanar waveguide (SCPW) resonators have a wide range of applications due to the combination of their planar geometry and high quality factors relative to normal metals. However, their performance is sensitive to both the details of their geometry and the materials and processes that are used in their fabrication. In this paper, we study the dependence of SCPW resonator performance on materials and geometry as a function of temperature and excitation power. We measure quality factors greater than 2 × 106 at high excitation power and 6 × 105 at a power comparable to that generated by a single microwave photon circulating in the resonator. We examine the limits to the high excitation power performance of the resonators and find it to be consistent with a model of radiation loss. We further observe that while in all cases the quality factors are degraded as the temperature and power are reduced due to dielectric loss, the size of this effect is dependent on resonator materials and geometry. Finally, we demonstrate that the dielectric loss can be controlled in principle using a separate excitation near the resonance frequencies of the resonator.

arXiv:1010.6063Journal of Applied PhysicsMar 15, 2011213 citations

Quality factor dependence on geometry and photon number in superconducting coplanar resonators

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Quality factor dependence on geometry and photon number in superconducting coplanar resonators

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