UNT Scholarly Works - 9 Matching Results

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Fabrication of wide-IF 200–300GHz superconductor–insulator–superconductor mixers with suspended metal beam leads formed on silicon-on-insulator

Description: This article reports on a fabrication process that uses silicon-oninsulator (SOI) substrates and micromachining techniques to form wide-IF superconductor–insulator–superconductor (SIS) mixer devices that have suspended metal beam leads for rf grounding. Aside from a description of the fabrication process, electrical measurements of these Nb/Al–AlNₓ /Nb trilayer devices will also be presented.
Date: October 7, 2004
Creator: Kaul, Anupama; Bumble, Bruce; Lee, Karen A.; LeDuc, Henry G.; Rice, Frank & Zmuidzinas, Jonas
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Partner: UNT College of Engineering
open access

Geometrical dependence of the low-frequency noise in superconducting flux qubits

Description: Article reporting on a study of a series of 85 devices of vary design using a general method for directly measuring the low-frequency flux noise (below 10 Hz) in compound Josephson-junction superconducting flux qubits. The results support the hypothesis that local impurities in the vicinity of the qubit wiring are a key source of low-frequency flux noise in superconducting devices.
Date: February 26, 2009
Creator: Lanting, T.; Berkley, A. J.; Bumble, B.; Bunyk, P.; Fung, A.; Johansson, J. et al.
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Partner: UNT College of Engineering
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Internally shunted sputtered niobium nitride Josephson junctions with a TaNx barrier for nonlatching logic applications

Description: This article reports on the growth, fabrication, and device characterization of NbN internally shunted Josephson junctions with a TaNx barrier.
Date: December 28, 2000
Creator: Kaul, Anupama; Whiteley, Stephen R.; Van Duzer, Theodore; Yu, Lei; Newman, Nathan & Rowell, John M.
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Partner: UNT College of Engineering
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Interrogating vertically oriented carbon nanofibers with nanomanipulation for nanoelectromechanical switching applications

Description: Article demonstrates electrostatic switching in vertically oriented carbon nanofibers synthesized on refractory metallic nitride substrates, where pull-in voltages Vpi ranged from 10 to 40 V. A finite element model was also developed to determine a theoretical Vpi and results were compared to experiment.
Date: August 31, 2009
Creator: Kaul, Anupama; Khan, Abdur R.; Bagge, Leif; Megerian, Krikor G.; LeDuc, Henry G. & Epp, Larry
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Partner: UNT College of Engineering
open access

Probing Noise in Flux Qubits via Macroscopic Resonant Tunneling

Description: Article on the characterization of noise in a flux qubit using macroscopic resonant tunneling between the two lowest lying states of a bistable rf SQUID. Analysis of these results indicates that the dominant source of low energy flux noise in this device is a quantum mechanical environment in thermal equilibrium.
Date: September 10, 2008
Creator: Harris, R.; Johnson, M. W.; Han, S.; Berkley, A. J.; Johansson, J.; Bunyk, P. et al.
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Partner: UNT College of Engineering
open access

Synchronization of multiple coupled rf-SQUID flux qubits

Description: Article demonstrating a practical strategy for synchronizing the properties of compound Josephson junction (CJJ) radio frequency monitored superconducting quantum interference device (rf-SQUID) qubits on a multi-qubit chip.
Date: December 21, 2009
Creator: Harris, R.; Brito, F.; Berkley, A. J.; Johansson, J.; Johnson, M. W.; Lanting, T. et al.
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Partner: UNT College of Engineering
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