Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Electronics Letters

Implementation of Josephson tunnel junction series array stripline with high characteristic impedance for quantum voltage standards

P. Gutmann, E. Vollmer, J. Kohlmann, F. Müller, Th. Weimann, J. Niemeyer

Published Jul 16, 1992• 3 citations
Publisher

Abstract

A Josephson voltage standard based on a tunnel junction series array stripline with a characteristic impedance of 77Ω has been developed and implemented demonstrating improved performance compared to the usual design with characteristic impedances below 5Ω.
DOI
10.1049/el:19920904

Related papers

Josephson oscillations in a series array Josephson voltage standard

H.‐G. Meyer, Wolfram Krech, B. Mikolajczak

Josephson oscillations in a large series array of Josephson junctions designed as a superconducting microwave transmission line are studied. For descriptions of the Josephson junctions both the Stewart–McCumber model and the Werthamer model are used. The attenuation of the Josephson oscillations in the considered array is composed of two terms rising from the stripline and from the Josephson junctions. The latter one is of increasing significance for lower than usually applied drive frequencies.

Journal of Applied Physics•Jun 1, 1989•8 citations

Optimized 1 V and 10 V Josephson series arrays

F. Muller, R. Pöpel, J. Kohlmann +6 more

By means of a new fabrication method and detailed design investigations we have been able to optimize the array circuits for the Josephson voltage standard. Even in very long arrays (4800 junctions in one stripline) a yield of 1 mV per junction could be achieved. The microwave power at 70 GHz required for the stable operation of 1 V and 10 V circuits could be reduced down to 1 mW and 10 mW (antenna input), respectively.

Conference on Precision Electromagnetic Measurements•Dec 23, 2002•2 citations

Series arrays of NbSi barrier Josephson junctions for AC voltage standards

J. Kohlmann, Oliver Kieler, Thomas Scheller +3 more

AC Josephson voltage standards are typically based on series arrays of overdamped Josephson junctions, which are presently realized using an NbxSi1-xbarrier at PTB. The characteristic parameters of these SNS-like junctions can be tuned by the Nb content and the thickness of the barrier over a wide range for operation from 10 GHz to 70 GHz. Based on these junctions, we developed binary-divided 10 V arrays as well as pulse-driven arrays for 1 V output voltages.

Conference on Precision Electromagnetic Measurements•Jul 1, 2016•2 citations

Coplanar strips for Josephson voltage standard circuits

M. Schubert, T. May, G. Wende +2 more

We present a microwave circuit for Josephson voltage standards. Here, the Josephson junctions are integrated in a microwave transmission line designed as coplanar strips (CPS). The new layout offers the possibility of achieving a higher scale of integration and to considerably simplify the fabrication technology. The characteristic impedance of the CPS is about 50 Ω, and this should be of interest for programmable Josephson voltage standard circuits with SNS or SINIS junctions. To demonstrate the function of the microwave circuit design, conventional 10 V Josephson voltage standard circuits with 17 000 Nb/AlOx/Nb junctions were prepared and tested. Stable Shapiro steps at the 10 V level were generated. Furthermore, arrays of 1400 SINIS junctions in this microwave layout exhibited first-order Shapiro steps.

Applied Physics Letters•Aug 13, 2001•22 citations

Development of 10-v josephson series arrays

Se Il Park, Hyun Kwon Hong

Developed a new fabrication process for 10-V Josephson junction series arrays (JJAs). A plasma nitridation process is employed for reducing the microwave attenuation in the Josephson microstripline. Improvements of microwave attenuation are about 2 dB for test arrays of 2000, 3000, and 4000 Josephson junctions in a single stripline. We obtained stable quantized voltage steps up to 12 V at 76.4 and 86.8 GHz with step amplitudes of more than 5 /spl mu/A and stability times of more than 5 min. The circuits used 14 648 junctions arranged in 8 parallel paths.

IEEE Transactions on Instrumentation and Measurement•Apr 1, 2003•3 citations

Hybrid integration of microwave oscillators with Josephson series arrays for the use as voltage standards

Franz X. Hebrank, P. Gutmann, F. Muller +2 more

We have designed and fabricated a new type of Josephson device to be hybrid integrated with microstripline oscillators. For optimum matching of the Josephson series array to the oscillator the samples make use of a new stripline design. The first circuits were fabricated in a simplified Nb/Al/sub 2/O/sub 3//Nb technology and exhibit excellent dc characteristics and good microwave coupling to the junctions of the array. At 70 GHz constant voltage steps up to 350 mV could be observed. By hybrid integrating different samples with a new 10-GHz oscillator, constant voltage steps were created. For this experiment the Josephson current density had to be low enough to reduce the plasma frequency of the junctions to well below the driving frequency.>

IEEE Transactions on Applied Superconductivity•Jun 1, 1995•5 citations
Josephson oscillations in a large series array of Josephson junctions designed as a superconducting microwave transmission line are studied. For descriptions of the Josephson junctions both the Stewart–McCumber model and the Werthamer model are used. The attenuation of the Josephson oscillations in the considered array is composed of two terms rising from the stripline and from the Josephson junctions. The latter one is of increasing significance for lower than usually applied drive frequencies.
We present a microwave circuit for Josephson voltage standards. Here, the Josephson junctions are integrated in a microwave transmission line designed as coplanar strips (CPS). The new layout offers the possibility of achieving a higher scale of integration and to considerably simplify the fabrication technology. The characteristic impedance of the CPS is about 50 Ω, and this should be of interest for programmable Josephson voltage standard circuits with SNS or SINIS junctions. To demonstrate the function of the microwave circuit design, conventional 10 V Josephson voltage standard circuits with 17 000 Nb/AlOx/Nb junctions were prepared and tested. Stable Shapiro steps at the 10 V level were generated. Furthermore, arrays of 1400 SINIS junctions in this microwave layout exhibited first-order Shapiro steps.
Developed a new fabrication process for 10-V Josephson junction series arrays (JJAs). A plasma nitridation process is employed for reducing the microwave attenuation in the Josephson microstripline. Improvements of microwave attenuation are about 2 dB for test arrays of 2000, 3000, and 4000 Josephson junctions in a single stripline. We obtained stable quantized voltage steps up to 12 V at 76.4 and 86.8 GHz with step amplitudes of more than 5 /spl mu/A and stability times of more than 5 min. The circuits used 14 648 junctions arranged in 8 parallel paths.
We have designed and fabricated a new type of Josephson device to be hybrid integrated with microstripline oscillators. For optimum matching of the Josephson series array to the oscillator the samples make use of a new stripline design. The first circuits were fabricated in a simplified Nb/Al/sub 2/O/sub 3//Nb technology and exhibit excellent dc characteristics and good microwave coupling to the junctions of the array. At 70 GHz constant voltage steps up to 350 mV could be observed. By hybrid integrating different samples with a new 10-GHz oscillator, constant voltage steps were created. For this experiment the Josephson current density had to be low enough to reduce the plasma frequency of the junctions to well below the driving frequency.>