Fabrication and characterization of vacuum-gap microstrip resonators

• URL: http://arxiv.org/abs/2503.07431v1
• Date: Mon, 10 Mar 2025 15:14:11 GMT
• Title: Fabrication and characterization of vacuum-gap microstrip resonators
• Authors: Christian Schlager, Romain Albert, Gerhard Kirchmair,
• Abstract summary: We report on the development of a fabrication process for vacuum-gap microstrips.<n>In addition to high-capacitance transmission lines, this architecture also enables air-bridges and compact parallel-plate capacitors.<n>The performance of the fabrication is examined using distributed aluminum and granular aluminum resonators in a cryogenic dilution refrigerator setup.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In traveling-wave parametric amplifiers (TWPAs) low-loss capacitors are necessary to provide 50 $\Omega$ impedance matching to the increased inductance that is brought in by the nonlinear elements used for amplification, be it Josephson junctions or high kinetic inductance materials. Here we report on the development of a fabrication process for vacuum-gap microstrips, a design in which the ground plane is suspended in close proximity above the center conductor without the support of a dielectric. In addition to high-capacitance transmission lines, this architecture also enables air-bridges and compact parallel-plate capacitors. The performance of the fabrication is examined using distributed aluminum and granular aluminum resonators in a cryogenic dilution refrigerator setup, showing quality factors on par with the fabrication processes used in state-of-the-art TWPAs. In addition to characterizing the dependence of the quality factors on power, also their behavior with respect to temperature is explored, applying a model based on thermal quasi-particles and saturable two-level systems (TLS), showing that the quality factors of the resonators are limited by TLS.

Related papers

• Fabrication and characterization of low-loss Al/Si/Al parallel plate capacitors for superconducting quantum information applications [0.0]
  parallel plate capacitors composed of aluminum-contacted, crystalline silicon fins are shown to be a promising technology for use in superconducting circuits. Single-crystal Si capacitors are incorporated in lumped element resonators and transmons by shunting them with lithographically patterned aluminum inductors and conventional $Al/AlO_x/Al$ Josephson junctions.
  arXiv  Detail & Related papers  (2024-08-02T16:24:22Z)
• Thin-film quartz for high-coherence piezoelectric phononic crystal resonators [0.0]
  Piezoelectric phononic crystal resonators (PCRs) are a promising platform for acoustic quantum processing. We fabricate PCRs from a new substrate: thin-film quartz. We characterize the loss channels in these devices and find that, although improved, the low-power response is still limited by coupling to a TLS bath.
  arXiv  Detail & Related papers  (2024-06-20T18:27:10Z)
• Site-Controlled Purcell-Induced Bright Single Photon Emitters in Hexagonal Boron Nitride [62.170141783047974]
  Single photon emitters hosted in hexagonal boron nitride (hBN) are essential building blocks for quantum photonic technologies that operate at room temperature. We experimentally demonstrate large-area arrays of plasmonic nanoresonators for Purcell-induced site-controlled SPEs. Our results offer arrays of bright, heterogeneously integrated quantum light sources, paving the way for robust and scalable quantum information systems.
  arXiv  Detail & Related papers  (2024-05-03T23:02:30Z)
• High-Q trenched aluminum coplanar resonators with an ultrasonic edge microcutting for superconducting quantum devices [0.0]
  Dielectric losses are one of the key factors limiting the coherence of superconducting qubits. We report on superconducting CPW microwave resonators with internal quality factors exceeding 5x106 at high powers and 2x106 at low power. Josephson junction compatible CPW resonators fabrication process with both airbridges and silicon substrate etching is proposed.
  arXiv  Detail & Related papers  (2023-06-28T15:25:37Z)
• Performance of high impedance resonators in dirty dielectric environments [0.0]
  Internal quality factors of high-impedance resonators exceed $103$ in all investigated oxide configurations. These experiments pave the way for large-scale, spin-based quantum computers.
  arXiv  Detail & Related papers  (2023-02-13T12:06:56Z)
• Thermal self-oscillations in monolayer graphene coupled to a superconducting microwave cavity [58.720142291102135]
  We observe thermal self-oscillations in a monolayer graphene flake coupled to superconducting resonator. The experimental observations fit well with theoretical model based on thermal instability. The modelling of the oscillation sidebands provides a method to evaluate electron phonon coupling in disordered graphene sample at low energies.
  arXiv  Detail & Related papers  (2022-05-27T15:38:41Z)
• Power and temperature dependent model for High Q superconductors [0.0]
  Measuring the internal quality factor of coplanar waveguide superconducting resonators is an established method of determining small losses in superconducting devices.<n> excess non-equilibrium quasiparticles can also limit the quality factor of the planar superconducting resonators used in circuit quantum electrodynamics.<n>Here a two-temperature, power and temperature dependent model is proposed to evaluate resonator losses for isolating TLS and quasiparticle loss simultaneously.
  arXiv  Detail & Related papers  (2022-05-12T18:10:24Z)
• TOF-SIMS Analysis of Decoherence Sources in Nb Superconducting Resonators [48.7576911714538]
  Superconducting qubits have emerged as a potentially foundational platform technology. Material quality and interfacial structures continue to curb device performance. Two-level system defects in the thin film and adjacent regions introduce noise and dissipate electromagnetic energy.
  arXiv  Detail & Related papers  (2021-08-30T22:22:47Z)
• Measurement of the Low-temperature Loss Tangent of High-resistivity Silicon with a High Q-factor Superconducting Resonator [58.720142291102135]
  We present the direct loss tangent measurement of a high-resist intrinsicivity (100) silicon wafer in the temperature range from 70 mK to 1 K. The measurement was performed using a technique that takes advantage of a high quality factor superconducting niobium resonator.
  arXiv  Detail & Related papers  (2021-08-19T20:13:07Z)
• Quantum Sensors for Microscopic Tunneling Systems [58.720142291102135]
  tunneling Two-Level-Systems (TLS) are important for micro-fabricated quantum devices such as superconducting qubits. We present a method to characterize individual TLS in virtually arbitrary materials deposited as thin-films. Our approach opens avenues for quantum material spectroscopy to investigate the structure of tunneling defects.
  arXiv  Detail & Related papers  (2020-11-29T09:57:50Z)
• Comparison of Dielectric Loss in Titanium Nitride and Aluminum Superconducting Resonators [45.82374977939355]
  Lossy dielectrics are a significant source of decoherence in superconducting quantum circuits. We fabricate isotropically trenched resonators to accentuate a specific dielectric region's contribution to resonator quality factor. We evaluate the quality factor of each TiN resonator geometry with and without a post-process hydrofluoric (HF) etch, and find that it reduced losses from the substrate-air interface.
  arXiv  Detail & Related papers  (2020-07-14T20:20:22Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.