Energy-efficient superconducting microprocessor

By: anon (please.delete@this.thank.you), January 13, 2021 11:35 pm
Room: Moderated Discussions
"2.5 GHz superconducting prototype uses 80 times less energy than its semiconductor counterpart, even accounting for cooling":
https://spectrum.ieee.org/tech-talk/computing/hardware/new-superconductor-microprocessor-yields-a-substantial-boost-in-efficiency

And the paper: https://ieeexplore.ieee.org/document/9295318

"We conducted the first successful demonstration of an adiabatic microprocessor based on unshunted Josephson junction (JJ) devices manufactured using a Nb/AlOLₓ/Nb superconductor IC fabrication process. It is a hybrid of RISC and dataflow architectures operating on 4-b data words. We demonstrate register file R/W access, ALU execution, hardware stalling, and program branching performed at 100 kHz under the cryogenic temperature of 4.2 K. We also successfully demonstrated a high-speed breakout chip of the microprocessor execution units up to 2.5 GHz. We use a logic primitive called the adiabatic quantum-flux-parametron (AQFP), which has a switching energy of 1.4 zJ per JJ when driven by a four-phase 5-GHz sinusoidal ac-clock at 4.2 K. These demonstrations show that AQFP logic is capable of both processing and memory operations and that we have a path toward practical adiabatic computing operating at high-clock rates while dissipating very little energy."
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