Low Temperature Superconducting Tunable Bandstop Resonator and Filter Using Superconducting RF MEMS Varactors

Attar, Sara S.; Setoodeh, Sormeh; Laforge, Paul D.; Bakri-Kassem, Maher; Mansour, Raafat R.

doi:10.1109/tasc.2014.2318315

Cited by 10 publications

(7 citation statements)

References 10 publications

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“…Our demonstrated procedure involving a combination of a well-controlled oxide regrowth, different material characterization techniques and measurement of resonator quality factors can be extended to selectively study other metal oxides losses relevant for quantum devices. Furthermore, the demonstrated oxide removal method can be utilized to reduce microwave losses in other devices, such as superconducting qubits, quantumlimited amplifiers [50], microwave kinetic inductance detectors [51], single photon detectors [52] or cryogenic filters [53].…”

Section: Discussionmentioning

confidence: 99%

Investigation of Microwave Loss Induced by Oxide Regrowth in High- Q Niobium Resonators

et al. 2021

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The coherence of state-of-the-art superconducting qubit devices is predominantly limited by two-level-system defects, found primarily at amorphous interface layers. Reducing microwave loss from these interfaces by proper surface treatments is key to push the device performance forward. Here, we study niobium resonators after removing the native oxides with a hydrofluoric acid etch. We investigate the reappearance of microwave losses introduced by surface oxides that grow after exposure to the ambient environment. We find that losses in quantum devices are reduced by an order of magnitude, with internal Qfactors reaching up to 7×10 6 in the single photon regime, when devices are exposed to ambient conditions for 16 min. Furthermore, we observe that Nb2O5 is the only surface oxide that grows significantly within the first 200 hours, following the extended Cabrera-Mott growth model. In this time, microwave losses scale linearly with the Nb2O5 thickness, with an extracted loss tangent tanδNb2O5 = 9.9×10 -3 . Our findings are of particular interest for devices spanning from superconducting qubits, quantum-limited amplifiers, microwave kinetic inductance detectors to single photon detectors.

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Section: Discussionmentioning

confidence: 99%

Investigation of Microwave Loss Induced by Oxide Regrowth in High- Q Niobium Resonators

et al. 2021

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“…Tunable superconducting resonators have been extensively researched due to the merits of a high quality factor (Q-factor) and their frequency-tuning functionality. Generally, the tuning methods can be categorized into several groups including electrical [1][2][3], magnetic [4][5][6], optical [7,8], and mechanical ones [9,10]. Since these resonators can realize the frequency alignments of hybrid resonant systems, their potential applications are focused on detecting and processing the information in various forms of magnons, spins, phonons, optical photons, and so on [1,5].…”

Section: Introductionmentioning

confidence: 99%

A tunable superconducting LC-resonator with a variable superconducting electrode capacitor bank for application in wireless power transfer

He¹,

Wang²,

Yan³

2019

Supercond. Sci. Technol.

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The frequency alignment of resonators is essential for wireless power transfer (WPT) systems to achieve strongly coupled magnetic resonances. Here, we present a novel tunable superconducting resonator for WPT applications. The tunable resonator is composed of a high-temperature superconducting (HTS) coil and a variable HTS electrode capacitor bank based on two series YBa2C3O7−x–SrTiO3–YBa2C3O7−x thin films. The HTS coil serves as a wireless transmitting tool for power delivery, while the HTS electrode capacitor bank provides a frequency-tuning element for the resonator. At 77 K, the HTS materials cause low loss and thus achieve a high quality factor, while the incipient ferroelectric SrTiO3 substrate with HTS electrodes has a nonlinear capacitance dependence on the applied electric field with no hysteresis. A voltage supply applies a continuous DC bias to both capacitors synchronously via the coil, adjusting the total capacitance and thus the resonant frequency. Our results indicate that the tunable resonator can achieve a tuning range of 12% from 775 kHz, offering a frequency-tuning functionality to superconducting WPT technology.

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“…RF MEMS technology, including MEMS switches and varactors, features compact size, very low loss, high linearity, and high power-handling capacity at microwave frequencies [84]. LTS niobium-based superconducting micro-fabrication process was well developed which enabled the monolithic integration of gold-based RF MEMS devices with niobium superconducting RF circuits [85], and reconfigurable MMIC LTS resonator and filter have been developed [86]. The reported Nb reconfigurable bandstop filter demonstrated a sweep of frequency from 2.62 to 2.54 GHz and a discrete shift from 2.54 to 1.95 GHz.…”

Section: Reconfigurable Hts Filtersmentioning

confidence: 99%

High-Tc Superconducting Microwave and Millimeter Devices and Circuits—An Overview

Zhang

Guo

2022

IEEE J. Microw.

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High temperature (high-Tc) superconductors (HTS) have found many applications in the last two decades. To microwave researchers and engineers, the ultra-low surface resistance of the thin-film HTS materials at microwave and millimeter frequencies and the highly non-linear Josephson junctions are of particular interest. The former can be exploited in the design and fabrication of passive microwave components and circuits with superior performance, and the latter can be exploited to create many novel active HTS devices. This paper provides an overview of the state-of-art development of HTS devices and circuits for microwave and mm-wave communication front-end receiver systems. The paper is particularly focused on the latest advancement of HTS Josephson junction based active devices, monolithic microwave integrated circuits (MMIC), and whole receiver systems integrated with cryocoolers.INDEX TERMS Filters, high temperature superconductors (HTS), Josephson junction, mixers, receivers.

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Low Temperature Superconducting Tunable Bandstop Resonator and Filter Using Superconducting RF MEMS Varactors

Cited by 10 publications

References 10 publications

Investigation of Microwave Loss Induced by Oxide Regrowth in High- Q Niobium Resonators

Investigation of Microwave Loss Induced by Oxide Regrowth in High- Q Niobium Resonators

A tunable superconducting LC-resonator with a variable superconducting electrode capacitor bank for application in wireless power transfer

High-Tc Superconducting Microwave and Millimeter Devices and Circuits—An Overview

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