Effect of metal/substrate interfaces on radio-frequency loss in superconducting coplanar waveguides

Wisbey, David; Gao, Jiansong; Vissers, Michael; Silva, Fabio C. S. da; Kline, Jeffrey S.; Vale, Leila R.; Pappas, David P.

doi:10.1063/1.3499608

Cited by 71 publications

(76 citation statements)

References 17 publications

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“…A prominent resonator decoherence source at low powers has previously been found to be two-level states (TLSs) on the various surfaces. [8][9][10][11][12] Knowing TLS locations is important to improve the resonators. Previous measurements and simulations suggested that the exposed metal surface (metal-air interface) is a crucial decoherence source, [9][10][11] driving research in using non-oxidizing superconductors for quantum devices.…”

mentioning

confidence: 99%

Surface loss simulations of superconducting coplanar waveguide resonators

Wenner

Barends

Bialczak

et al. 2011

Applied Physics Letters

158

190

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Losses in superconducting planar resonators are presently assumed to predominantly arise from surfaceoxide dissipation, due to experimental losses varying with choice of materials. We model and simulate the magnitude of the loss from interface surfaces in the resonator, and investigate the dependence on power, resonator geometry, and dimensions. Surprisingly, the dominant surface loss is found to arise from the metalsubstrate and substrate-air interfaces. This result will be useful in guiding device optimization, even with conventional materials.

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mentioning

confidence: 99%

Surface loss simulations of superconducting coplanar waveguide resonators

Wenner

Barends

Bialczak

et al. 2011

Applied Physics Letters

158

190

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“…We can see clearly from Figure 4 that, with increasing temperature, the center frequency shifts to higher value and the resonance dip becomes broader and shallower. Phenomenally, these behaviors can be explained in the framework of the two-level systems (TLSs) theory [22,23], in which the unsaturated TLSs residing on the metal and dielectric surfaces are believed to be a significant loss mechanism. The resonant interaction of TLSs with electric field (microwave) leads to a temperature dependent variation of the substrate dielectric constant.…”

Section: Resultsmentioning

confidence: 99%

Experimental demonstrations of high-Q superconducting coplanar waveguide resonators

Wang

Wei

et al. 2013

Chin. Sci. Bull.

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We successfully designed and fabricated an absorption-type of superconducting coplanar waveguide (CPW) resonators. The resonators are made from a niobium film (about 160 nm thick) on a high-resistance Si substrate, and each resonator is fabricated as a meandered quarter-wavelength transmission line (one end is short to the ground and another end is capacitively coupled to a through feedline). With a vector network analyzer we measured the transmissions of the applied microwave through the resonators at ultra-low temperature. The obtained loaded quality factors are significantly high, i.e. up to ~10 6 . When the temperature increases slowly from the base temperature (20 mK), the resonance frequencies of the resonators are blue shifted and the quality factors are lowered slightly. In principle, this type of device can integrate a series of CPW resonators with a common feedline, making it a promising candidate as the data bus for coupling distant solid-state qubits and the sensitive detector of single photons.superconducting coplanar waveguide resonator, resonance frequency, quality factor Citation:

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“…As a consequence, the relevant observations could not be explained by the standard MBT. Recently, an approach beyond the MBT has been proposed by considering the coherent effects of the quantized two-level systems [16,[21][22][23] on top of the resonator film due to the existence of native oxides layer [14,16]. Practically, before the measurement, the device has to be exposed to the air environment for preparation, thus a severalnanometer-thick native oxide layer could be formed on top surface of the resonator.…”

Section: Irradiation Saturate Temperatures Of Superconducting Resonatmentioning

confidence: 99%

Microwave Resonators for Weak Light Detection at Telecom Wavelength

Zhou¹,

Wang²,

Wei³

et al. 2014

PIER

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Abstract-We report the experimental measurements of weak light signal at 1550 nm wavelength with a high-quality factor microwave coplanar waveguide (CPW) resonators. The quality factor of this niobium λ/4 CPW resonator is measured as Q = 7.4 × 10 5 at ultra-low temperature (20 mK). With this device, we developed a technique to implement the proper fiber-resonator coupling, and realized the desirable weak light detection at telecommunication wavelength with 35 pW resolution by probing the shift of resonance frequency (f 0 ). We found that the resonator shift increases with the increasing light power (from 11.7 pW to 9.77 nW), similar to the effects of increasing the system temperature (from 20 mK to 800 mK). The observed blue shifts of f 0 (with the increasing of either the temperature and the applied light powers) are thoroughly deviated from the usual Mattis-Bardeen theory prediction, and could be explained by the effects relating to the two-level system existed on surface of the CPW device.

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Effect of metal/substrate interfaces on radio-frequency loss in superconducting coplanar waveguides

Cited by 71 publications

References 17 publications

Surface loss simulations of superconducting coplanar waveguide resonators

Surface loss simulations of superconducting coplanar waveguide resonators

Experimental demonstrations of high-Q superconducting coplanar waveguide resonators

Microwave Resonators for Weak Light Detection at Telecom Wavelength

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