Integrated information storage and transfer with a coherent magnetic device

TL;DR

This paper proposes a novel quantum magnetic device that combines information storage and transfer functionalities using large-spin quantum magnets, avoiding complex hybrid systems and enabling hundreds of operations within coherence times.

Contribution

It introduces a unified approach to quantum magnetic systems for both memory and data-bus functions, leveraging different energy levels within the same system.

Findings

Potential to implement hundreds of operations within coherence time.

Feasible with molecular magnets and adatoms on surfaces.

Avoids complexity of hybrid quantum systems.

Abstract

Quantum systems are inherently dissipation-less, making them excellent candidates even for classical information processing. We propose to use an array of large-spin quantum magnets for realizing a device which has two modes of operation: memory and data-bus. While the weakly interacting low-energy levels are used as memory to store classical information (bits), the high-energy levels strongly interact with neighboring magnets and mediate the spatial movement of information through quantum dynamics. Despite the fact that memory and data-bus require different features, which are usually prerogative of different physical systems -- well isolation for the memory cells, and strong interactions for the transmission -- our proposal avoids the notorious complexity of hybrid structures. The proposed mechanism can be realized with different setups. We specifically show that molecular magnets, as the most promising technology, can implement hundreds of operations within their coherence time, while adatoms on surfaces probed by a scanning tunneling microscope is a future possibility.