Journal ArticleDOI
Limitations on HTS single flux quantum logic
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TLDR
In this article, the authors studied the effect of layout induced stray inductance on the feasibility of HTS circuits using the T flip-flop as an example and developed numerical methods to study noise induced errors and how they depend on circuit parameters.Abstract:
There is widespread interest in transferring Single Flux Quantum (SFQ) logic from niobium technology to a suitable HTS technology. The higher operating temperature results in increased noise and associated errors. We have developed numerical methods to study noise induced errors and how they depend on circuit parameters. A simple picture holds for all the circuits studied to date. The error probability shows an error function (integrated Gaussian) distribution. The width of the distribution is circuit dependent, but is 1 to 4 times the noise contribution of a single junction, and the noise free (deterministic) margin corresponds to the point where the error probability is 0.5. The distributions are frequently asymmetric, and minimum error rate does not occur for a design centered between the deterministic margins. A stochastic optimizer has been developed that allows us reoptimize circuits for conditions when noise induced margin narrowing is important. We have used this to study the influence of layout induced stray inductance on the feasibility of HTS circuits using the T flip-flop as an example. Stray inductance appears to be as important as junction reproducibility, and significant improvements are needed to allow high operating temperatures.read more
Citations
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Journal ArticleDOI
A scalable control system for a superconducting adiabatic quantum optimization processor
Mark W. Johnson,Paul I. Bunyk,F Maibaum,Elena G. Tolkacheva,Andrew J. Berkley,E. M. Chapple,Richard Harris,J. Johansson,Trevor Lanting,I. Perminov,E. Ladizinsky,T. Oh,Geordie Rose +12 more
TL;DR: In this paper, a scalable system for applying independently programmable time-independent, and limited time-dependent flux biases to control superconducting devices in an integrated circuit is presented, which requires six digital address lines, two power lines, and a handful of global analog lines.
Journal ArticleDOI
A scalable control system for a superconducting adiabatic quantum optimization processor
Mark W. Johnson,Paul I. Bunyk,F Maibaum,Elena G. Tolkacheva,Andrew J. Berkley,E. M. Chapple,Richard Harris,J. Johansson,Trevor Lanting,I. Perminov,E. Ladizinsky,T. Oh,Geordie Rose +12 more
TL;DR: In this article, a scalable system for applying independently programmable time-independent, and limited time-dependent flux biases to control superconducting devices in an integrated circuit is presented, which requires six digital address lines, two power lines, and a handful of global analog lines.
Journal ArticleDOI
Reduced Power Consumption in Superconducting Electronics
TL;DR: In this article, the authors present an assessment of different approaches for reducing the static power consumption by investigating the potential of inductive bias distribution networks as well as reduced critical currents and inductive biasing.
Book ChapterDOI
Superconductor Devices for Ultrafast Computing
TL;DR: The question of how long this progress will continue has been the subject of much scientific and pseudo-scientific speculation over the last three decades of the exponential growth of this mainstream technology as mentioned in this paper.
Journal ArticleDOI
Design methodology of single-flux-quantum flip-flops composed of both 0- and π-shifted Josephson junctions
Yuki Yamanashi,Sotaro Nakaishi,Akira Sugiyama,Naoki Takeuchi,Naoki Takeuchi,Nobuyuki Yoshikawa +5 more
TL;DR: In this paper, a methodology for designing single-flux-quantum (SFQ) flip-flops composed of both conventional (0-) and π-shifted Josephson junctions is investigated.
References
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Journal ArticleDOI
Rapid single flux quantum random access memory
TL;DR: The RSFQ RAM as discussed by the authors uses ballistic transfer of SFQ pulses along bit lines (either Josephson transmission lines, or passive superconducting microstrip lines) and inductively coupled to word lines.
Journal ArticleDOI
Complementary output switching logic-a new superconducting voltage-state logic family
TL;DR: A new superconducting logic family, complementary output switching logic (COSL), is proposed, which consists of AND, NAND, OR, NOR, and XOR gates and its functionality and margins are verified by measurements at low speed.