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Springer eBooks

Josephson Digital and Analog Devices with Niobium Junctions

S. Hasuo

Published Jan 1, 1989• 0 citations
Publisher
DOI
10.1007/978-4-431-68084-0_13

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An analog to digital converter (ADC) using the rapid single flux quantum (RSFQ) logic family implemented in niobium nitride (NbN) technology is described. The circuit was originally developed and demonstrated in niobium technology. An identical circuit was then laid out, fabricated and demonstrated in NbN technology. The chips were fabricated using an eight-layer NbN-based process with Josephson junction critical current density of 500 A/cm/sup 2/. In this paper, we report on the measurement results for a 6-bit flux quantizing ADC which exhibited proper operation and good DC bias margins. We also demonstrate results from an ADC chip operating up to 9.5 K.>

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Scientific Reports•Aug 13, 2020•31 citations
An analog to digital converter (ADC) using the rapid single flux quantum (RSFQ) logic family implemented in niobium nitride (NbN) technology is described. The circuit was originally developed and demonstrated in niobium technology. An identical circuit was then laid out, fabricated and demonstrated in NbN technology. The chips were fabricated using an eight-layer NbN-based process with Josephson junction critical current density of 500 A/cm/sup 2/. In this paper, we report on the measurement results for a 6-bit flux quantizing ADC which exhibited proper operation and good DC bias margins. We also demonstrate results from an ADC chip operating up to 9.5 K.>
In the field of superconducting electronics, a π phase shifter based on a ferromagnetic Josephson junction is expected to provide various advantages to classical and quantum superconducting devices. Here we report niobium nitride (NbN)-based ferromagnetic π junctions on a silicon (Si) substrate with a titanium nitride (TiN) buffer layer, which have applications to flux-bias-free flux quantum bits (qubits) and classical digital logic elements. We fabricated and characterized NbN/aluminum nitride (AlN)/NbN Josephson junctions, NbN/copper nickel (CuNi)/NbN ferromagnetic Josephson junctions, and superconducting quantum interference devices (SQUIDs) consisting of these junctions on the Si substrate. The fabricated NbN/AlN/NbN junctions showed a high junction quality suitable for qubit applications. Furthermore, the magnetic field dependence of the SQUID's critical current indicated that the NbN/CuNi/NbN junction worked as a π phase shifter on the Si substrate.