Niobium and Tantalum High Q Resonators for Photon Detectors

Barends, R.; Baselmans, J. J. A.; Hovenier, J. N.; Gao, J. R.; Yates, S. J. C.; Klapwijk, T. M.; Hoevers, H.

doi:10.1109/tasc.2007.898541

Cited by 51 publications

(31 citation statements)

References 18 publications

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“…Particularly, we observed that the resonant frequency of the measured CPW increases with the increasing temperature and also the increasing incident light power. Obviously, if the light incidence events can be seemed equally to the increasing temperature effects, then our observations should be essentially different from those phenomena observed in the experiments with the Tantalum-and Tungsten-Silicide-alloy resonators [14,15] (where the measured resonance frequencies of the resonator decrease with the increasing temperature). Our results, deviated from the MBT, could be explained by the effects related to two-level systems existing on top of the resonator surface [16].…”

Section: Introductioncontrasting

confidence: 83%

“…As a consequence, the measured resonant frequency of the CPW will decrease due to the increased L s , and the quality factor (Q) of the resonator will decrease due to the increased R s . These effects have been verified in the previous CPW experiments, wherein the measurements are ac achieved near the critical temperature of the resonator [14,15].…”

Section: Introductionsupporting

confidence: 75%

“…The above observations clearly show that, for a λ/4 resonator working at extremely low temperature regime (20 mK), the center frequencies of resonator increase with the increasing system temperature. Obviously, these behaviors are manifestly deviated from the prediction of MBT [12,14,15]. Based on the MBT, the resonant frequency of the resonator may also decrease under the light irradiation if the irradiation events could be served as the local heating effects.…”

Section: Irradiation Saturate Temperatures Of Superconducting Resonatmentioning

confidence: 90%

“…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%

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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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Section: Introductioncontrasting

confidence: 83%

Section: Introductionsupporting

confidence: 75%

Section: Irradiation Saturate Temperatures Of Superconducting Resonatmentioning

confidence: 90%

Section: Irradiation Saturate Temperatures Of Superconducting Resonatmentioning

confidence: 99%

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Microwave Resonators for Weak Light Detection at Telecom Wavelength

Zhou¹,

Wang²,

Wei³

et al. 2014

PIER

View full text Add to dashboard Cite

show abstract

“…The source of this loss may be due to excess quasiparticles, 28 loss at the surface of the superconductor, or in the dielectric material but the exact origin is not known. 29,30 To make an improved estimate of the dissipated power, we take this saturation into account by modifying the internal quality factor in Eq. ͑7͒ by…”

Section: B Power Dissipationmentioning

confidence: 99%

Readout-power heating and hysteretic switching between thermal quasiparticle states in kinetic inductance detectors

Visser

Withington

Goldie

2010

Journal of Applied Physics

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A model is presented for readout-power heating in kinetic inductance detectors. It is shown that the power dissipated by the readout signal can cause the temperature of the quasiparticle system in the superconducting resonator to switch between well-defined states. At low readout powers, only a single solution to the heat balance equation exists, and the resonance curve merely distorts as the readout power is increased. At high readout powers, three states exist, two of which are stable, and the resonance curve shows hysteretic switching. The power threshold for switching depends on the geometry and material used but is typically around Ϫ70 dBm for Aluminum resonators. A comprehensive set of simulations is reported, and a detailed account of the switching process is given. Experimental results are also shown, which are in strong qualitative agreement with the simulations. The general features of the model are independent of the precise cooling function, and are even applicable for resonators on suspended, thermally isolated, dielectric membranes, where an increase in quasiparticle lifetime is expected. We discuss various extensions to the technique, including the possibility of recovering the cooling function from large-signal measurements of the resonance curve.

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Superconducting Resonators Based on TiN/Tapering/NbN/Tapering/TiN Heterostructures

et al. 2016

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We fabricated a type of superconducting heterostructures, TiN/tapering/NbN/tapering/TiN, on c-cut sapphire substrates by reactive magnetron sputtering. The goal is to achieve an x-band resonator that maintains a high Q in modest magnetic fields. The structure shows (111) orientation with local epitaxial correlation, as a result of stacking face-centered-cubic structures on top of hexagonal-closepacking substrates. The artificial tapering layers vary gradually from NbN into TiN and vice versa, creating a smooth transition so that no distinct interface exists. We characterized microstrip single line resonators on these heterostructures that are promising candidates for quantum information processing with hybrid nuclear-electron spins.

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Niobium and Tantalum High Q Resonators for Photon Detectors

Cited by 51 publications

References 18 publications

Microwave Resonators for Weak Light Detection at Telecom Wavelength

Microwave Resonators for Weak Light Detection at Telecom Wavelength

Readout-power heating and hysteretic switching between thermal quasiparticle states in kinetic inductance detectors

Superconducting Resonators Based on TiN/Tapering/NbN/Tapering/TiN Heterostructures

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