Gigahertz Sub-Landauer Momentum Computing

TL;DR

This paper presents a novel momentum computing device using Josephson junctions that achieves nanosecond speeds and sub-Landauer thermodynamic efficiency, enabling high-speed, energy-efficient reversible computing.

Contribution

It introduces a physically-realizable momentum computing paradigm with a scalable Josephson junction implementation for fast, thermodynamically-efficient bit swaps.

Findings

Device operates at nanosecond speeds.

Achieves sub-Landauer thermodynamic efficiency.

Robust performance demonstrated through simulations.

Abstract

We introduce a fast and highly-efficient physically-realizable bit swap. Employing readily available and scalable Josephson junction microtechnology, the design implements the recently introduced paradigm of momentum computing. Its nanosecond speeds and sub-Landauer thermodynamic efficiency arise from dynamically storing memory in momentum degrees of freedom. As such, during the swap, the microstate distribution is never near equilibrium and the memory-state dynamics fall far outside of stochastic thermodynamics that assumes detailed-balanced Markovian dynamics. The device implements a bit-swap operation -- a fundamental operation necessary to build reversible universal computing. Extensive, physically-calibrated simulations demonstrate that device performance is robust and that momentum computing can support thermodynamically-efficient, high-speed, large-scale general-purpose computing that circumvents Landauer's bound.