Anna Herr
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View article: Characterization of NbTiN/HZO/NbTiN MIM Capacitors for high frequency AC Clock & Power Distribution Network for Superconducting Digital Circuits
Characterization of NbTiN/HZO/NbTiN MIM Capacitors for high frequency AC Clock & Power Distribution Network for Superconducting Digital Circuits Open
A resonant clock-power distribution network is critical for scaling energy efficient superconducting digital technology to practical high integration density circuits. High-k, tunable capacitors enable implementation of a resonant power de…
View article: Flux trapping in NbTiN strips
Flux trapping in NbTiN strips Open
We use scanning superconducting quantum interference device (SQUID) microscopy to image vortices in superconducting strips fabricated from NbTiN thin films. We repeatedly cool superconducting strips with different width in an applied magne…
View article: A System Level Performance Evaluation for Superconducting Digital Systems
A System Level Performance Evaluation for Superconducting Digital Systems Open
Superconducting Digital (SCD) technology offers significant potential for enhancing the performance of next generation large scale compute workloads. By leveraging advanced lithography and a 300 mm platform, SCD devices can reduce energy c…
View article: Properties of Nb<i> <sub>x</sub> </i>Ti<sub>(1−<i>x</i>)</sub>N thin films deposited on 300 mm silicon wafers for upscaling superconducting digital circuits
Properties of Nb<i> <sub>x</sub> </i>Ti<sub>(1−<i>x</i>)</sub>N thin films deposited on 300 mm silicon wafers for upscaling superconducting digital circuits Open
Scaling superconducting digital circuits requires fundamental changes in the current material set and fabrication process. The transition to 300 mm wafers and the implementation of advanced lithography are instrumental in facilitating matu…
View article: Properties of Nb\_xTi\_{(1-x)}N thin films deposited on 300 mm silicon wafers for upscaling superconducting digital circuits
Properties of Nb\_xTi\_{(1-x)}N thin films deposited on 300 mm silicon wafers for upscaling superconducting digital circuits Open
Scaling superconducting digital circuits requires fundamental changes in the current material set and fabrication process. The transition to 300 mm wafers and the implementation of advanced lithography are instrumental in facilitating matu…
View article: Superconducting Pulse Conserving Logic and Josephson-SRAM
Superconducting Pulse Conserving Logic and Josephson-SRAM Open
Superconducting digital Pulse-Conserving Logic (PCL) and Josephson SRAM (JSRAM) memory together enable scalable circuits with energy efficiency 100x beyond leading-node CMOS. Circuit designs support high throughput and low latency when imp…
View article: Scaling NbTiN-based ac-powered Josephson digital to 400M devices/cm$^2$
Scaling NbTiN-based ac-powered Josephson digital to 400M devices/cm$^2$ Open
We describe a fabrication stackup for digital logic with 16 superconducting NbTiN layers, self-shunted a-silicon barrier Josephson Junctions (JJs), and low loss, high-$κ$ tunable HZO capacitors. The stack enables 400 MJJ/cm$^2$ device dens…
View article: Disentangling superconductor and dielectric microwave losses in sub-micron $\rm Nb$/$\rm TEOS-SiO_2$ interconnects using a multi-mode microstrip resonator
Disentangling superconductor and dielectric microwave losses in sub-micron $\rm Nb$/$\rm TEOS-SiO_2$ interconnects using a multi-mode microstrip resonator Open
Understanding the origins of power loss in superconducting interconnects is essential for the energy efficiency and scalability of superconducting digital logic. At microwave frequencies, power dissipates in both the dielectrics and superc…
View article: Synchronous chip-to-chip communication with a multi-chip resonator clock distribution network <sup>*</sup>
Synchronous chip-to-chip communication with a multi-chip resonator clock distribution network <sup>*</sup> Open
Superconducting digital circuits are a promising approach to build integrated systems with high energy-efficiency and computational density of the packaged chips. In such systems, performance of the data link between chips mounted on a mul…
View article: Propagation of picosecond pulses on superconducting transmission line interconnects <sup>*</sup>
Propagation of picosecond pulses on superconducting transmission line interconnects <sup>*</sup> Open
Interconnects are a major discriminator for superconducting digital technology, enabling energy-efficient data transfer and high-bandwidth heterogeneous integration. We report a method to simulate propagation of picosecond pulses in superc…
View article: Isochronous data link across a superconducting Nb flex cable with 5 femtojoules per bit <sup>*</sup>
Isochronous data link across a superconducting Nb flex cable with 5 femtojoules per bit <sup>*</sup> Open
Interconnect properties position superconducting digital circuits to build large, high performance, power efficient digital systems. We report a board-to-board communication data link, which is a critical technological component that has n…
View article: Measurement and data-assisted simulation of bit error rate in RQL circuits
Measurement and data-assisted simulation of bit error rate in RQL circuits Open
A circuit-simulation-based method is used to determine the thermally-induced bit error rate of superconducting Single Flux Quantum logic circuits. Simulations are used to evaluate the multidimensional Gaussian integral across noise current…
View article: Synchronous Chip-to-Chip Communication with a Multi-Chip Resonator Clock Distribution Network
Synchronous Chip-to-Chip Communication with a Multi-Chip Resonator Clock Distribution Network Open
Superconducting digital circuits are a promising approach to build packaged-level integrated systems with high energy-efficiency and computational density. In such systems, performance of the data link between chips mounted on a multi-chip…
View article: Propagation of Picosecond Pulses on Superconducting Transmission Line Interconnects
Propagation of Picosecond Pulses on Superconducting Transmission Line Interconnects Open
Interconnects are a major discriminator for superconducting digital technology, enabling energy efficient data transfer and high-bandwidth heterogeneous integration. We report a method to simulate propagation of picosecond pulses in superc…
View article: Measurement and Data-Assisted Simulation of Bit Error Rate in RQL Circuits
Measurement and Data-Assisted Simulation of Bit Error Rate in RQL Circuits Open
A circuit-simulation-based method is used to determine the thermally-induced bit error rate of superconducting logic circuits. Simulations are used to evaluate the multidimensional Gaussian integral across noise current sources attached to…
View article: Demonstration of superconducting memory for an RQL CPU
Demonstration of superconducting memory for an RQL CPU Open
Recent efforts to develop cryogenic processors are based on the elemental superconductor, niobium, and function at 4K. Since conventional silicon-based solutions will not operate at this temperature, new niobium-based memory elements are r…