Reduced frequency noise in superconducting resonators

Thick High Frequency Capacitive Harpss Resonators with Reduced Motional Resistance

This paper reports on implementation and high-Q operation of thick bulk mode VHF capacitive disk resonators with reduced motional resistance. Single crystal silicon (SCS) disk resonators as thick as 18 m with capacitive gap size of 160nm (aspect ratio>110) are fabricated on SOI substrates using a three-mask version of the HARPSS on SOI process. The new resonator design with increased number of ...

Tunable Superconducting Split Ring Resonators

Fluctuations from edge defects in superconducting resonators

Superconducting resonators, used in astronomy and quantum computation, couple strongly to microscopic two-level defects. We monitor the microwave response of superconducting resonators and observe fluctuations in dissipation and resonance frequency. We present a unified model where the observed dissipative and dispersive effects can be explained as originating from a bath of fluctuating two-lev...

Noise processes in nanomechanical resonators

Nanomechanical resonators can be fabricated to achieve high natural resonance frequencies, approaching 1 GHz, with quality factors in excess of 10. These resonators are candidates for use as highly selective rf filters and as precision on-chip clocks. Some fundamental and some nonfundamental noise processes will present limits to the performance of such resonators. These include thermomechanica...

Frequency Stability and Noise Characteristics of Ultra-High Frequency (UHF) Nanoelectromechanical Resonators

Nanoelectromechanical silicon carbide doubly-clamped beam vibrating resonators operating in the ultra-high frequency (UHF) band, with resonance frequencies of 395MHz, 411MHz, 428MHz, and 482MH, and quality factors (Q’s) of 2000~3000, have been demonstrated. The readout of electromechanical resonances from the nanodevices is integrated with a low-noise phase-locked loop to implement real-time re...