Superconductive Single FlUX Quantum Logic Devices and Circuits: Status, Challenges, and Opportunities

With switching speeds in hundreds of GHz and energy dissipation of 10
^_19
Joules per JJ transition, single flux quantum (SFQ) circuits can provide the speed and energy efficiency for beyond-Exascale computing. This article provides a review of the basic SFQ technology and reports recent advances in SFQ optimizations using qPALACE.