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

Japanese Journal of Applied Physics

Experimental Test of the Composite Josephson Device

Masakazu Nakanishi, Ko Hara

Published Nov 1, 1985• 1 citation
Publisher

Abstract

A circuit composed of superconductive loops of 4 Josephson junctions (abbreviated as JJ) or more with infinitesimal loop area is named as a Composite Josephson device (abbreviated as CJD). Its numerical analysis has been reported before. One of the CJD, a 3 terminal 6 JJ loop device, is fabricated by the microbridge utilizing step edge technology and its experimental tests are reported in this paper. Its numerical analysis is proved by the experimental tests.

DOI
10.1143/jjap.24.l890

Related papers

Composite Josephson Device

Masakazu Nakanishi, Ko Hara

A superconductive loop circuit including more than four Josephson junctions (JJ), which is called a Composite Josephson Device (CJD), can support a fluxoid stably without inductance and has multiple stable states depending on the number of fluxoids. One of the simplest cases of CJD with a three-terminal six JJ loop device is analyzed numerically. The result shows that it has five stable areas and is able to operate as a current amplifier within a certain parameter range.

Japanese Journal of Applied Physics•May 1, 1984•3 citations

Experimentally testing the circuit models of a Josephson junction embedded in a transmission line

P. H. Ouyang, Jiangang Ma, Suirong He +5 more

As a typical nonlinear device, Josephson junction (JJ) can be either served as a microwave device to scatter the traveling microwave or embedded in a transmission line (TL) resonator to modify the mode structure. However, two mutually exclusive circuit models have been proposed to describe the JJ embedded in a TL: one is the series embed model [see, e.g., Zueco et al., Phys. Rev. B 86, 024503 (2012)] and another is the parallel embedded one [see, e.g., Yamamoto et al., Appl. Phys. Lett. 93, 042510 (2008)]. Here, beginning with the comparison of the theoretical predictions of these two models, we fabricate the JJ-embedded TL device and measure its microwave scattering parameters at 50-mK low temperature. The experimental results support the parallel embedded model, thus rule out the series embedded one. The present work might lay the physical foundation for the designs of various microwave JJ devices, such as the microwave photonic crystals, superconducting qubits, also the Josephson parameter amplifiers, etc., by embedding the JJs into the superconducting TLs.

Applied Physics Letters•May 26, 2025•1 citation

Feasibility of biepitaxial YBa2Cu3O7−x Josephson junctions for fundamental studies and potential circuit implementation

Francesco Tafuri, Franco Carillo, Floriana Lombardi +7 more

We present various concepts and experimental procedures to produce biepitaxial ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}x}$ grain-boundary Josephson junctions. The device properties have an interesting phenomenology, related in part to the possible influence of $\mathrm{``}\ensuremath{\pi}$ loops.'' The performance of our junctions and superconducting quantum interference devices indicates significant improvement in the biepitaxial technique. Further, we propose methods for fabricating circuits in which 0 and $\ensuremath{\pi}$ loops are controllably located on the same chip.

arXiv:cond-mat/0010128•Physical review. B, Condensed matter•Dec 1, 2000•23 citations

A high-temperature superconducting step-edge Josephson junction mixer

Dan Dan Bai, Jia Du, Yu Sheng He

We report the experimental evaluation of a high-temperature superconducting (HTS) Josephson mixer based on a HTS step-edge junction on MgO substrate. The fabrication, operation principle of the mixer and the experimental results of the dynamic range, linearity, and the conversion efficiency are presented.

International Conference on Applied Superconductivity and Electromagnetic Devices•Oct 1, 2013•0 citations

Superconducting Electronics. Superconductor-Semiconductor Hybrid Device Technologies.

Akira Shoji

In this paper, the author describes studies on electronic devices and circuits utilizing both of superconductors and semniconductors. First, a design of an interface circuit composed of Josephson junctions and MOSFETs is described. The Josephson-MOS interface circuit will be used for realizing high-speed data communication between a Josephson digital circuit and a semiconductor one. Second, fabrication and characterization of MOSFETs with superconductive NbN gate electrodes are described. The use of superconductive gates makes it easy to hybridize MOSFETs with Josephson junctions. Finally, studies of Josephson-CMOS hybrid memory circuits are introduced.

TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)•Jan 1, 1996•0 citations

Progress in Nanofabrication of Superconducting Devices and Diverse Applications

A. Rebello, N.Y. Klein, L. M. Ruela +4 more

Superconducting circuits have emerged as a highly promising platform for quantum computing, among other divices based on Josephson junctions. The fabrication and testing of these devices requires especiallized nanofabrication facilities and milikelvin range testing equipment. In the search for the fabrication of these devices we have ran into limitations which forced us into creative solutions for the fabrications of these superconducting circuits and Josephson Junctions. Furthermore the development of these technologies allows for application in a wide range of research fields such as quantum computing, magnonics, micro-electromechanical systems and more.

IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers)•May 5, 2024•0 citations
A circuit composed of superconductive loops of 4 Josephson junctions (abbreviated as JJ) or more with infinitesimal loop area is named as a Composite Josephson device (abbreviated as CJD). Its numerical analysis has been reported before. One of the CJD, a 3 terminal 6 JJ loop device, is fabricated by the microbridge utilizing step edge technology and its experimental tests are reported in this paper. Its numerical analysis is proved by the experimental tests.
As a typical nonlinear device, Josephson junction (JJ) can be either served as a microwave device to scatter the traveling microwave or embedded in a transmission line (TL) resonator to modify the mode structure. However, two mutually exclusive circuit models have been proposed to describe the JJ embedded in a TL: one is the series embed model [see, e.g., Zueco et al., Phys. Rev. B 86, 024503 (2012)] and another is the parallel embedded one [see, e.g., Yamamoto et al., Appl. Phys. Lett. 93, 042510 (2008)]. Here, beginning with the comparison of the theoretical predictions of these two models, we fabricate the JJ-embedded TL device and measure its microwave scattering parameters at 50-mK low temperature. The experimental results support the parallel embedded model, thus rule out the series embedded one. The present work might lay the physical foundation for the designs of various microwave JJ devices, such as the microwave photonic crystals, superconducting qubits, also the Josephson parameter amplifiers, etc., by embedding the JJs into the superconducting TLs.
We present various concepts and experimental procedures to produce biepitaxial ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}x}$ grain-boundary Josephson junctions. The device properties have an interesting phenomenology, related in part to the possible influence of $\mathrm{``}\ensuremath{\pi}$ loops.'' The performance of our junctions and superconducting quantum interference devices indicates significant improvement in the biepitaxial technique. Further, we propose methods for fabricating circuits in which 0 and $\ensuremath{\pi}$ loops are controllably located on the same chip.
In this paper, the author describes studies on electronic devices and circuits utilizing both of superconductors and semniconductors. First, a design of an interface circuit composed of Josephson junctions and MOSFETs is described. The Josephson-MOS interface circuit will be used for realizing high-speed data communication between a Josephson digital circuit and a semiconductor one. Second, fabrication and characterization of MOSFETs with superconductive NbN gate electrodes are described. The use of superconductive gates makes it easy to hybridize MOSFETs with Josephson junctions. Finally, studies of Josephson-CMOS hybrid memory circuits are introduced.
Superconducting circuits have emerged as a highly promising platform for quantum computing, among other divices based on Josephson junctions. The fabrication and testing of these devices requires especiallized nanofabrication facilities and milikelvin range testing equipment. In the search for the fabrication of these devices we have ran into limitations which forced us into creative solutions for the fabrications of these superconducting circuits and Josephson Junctions. Furthermore the development of these technologies allows for application in a wide range of research fields such as quantum computing, magnonics, micro-electromechanical systems and more.