Fast bit flipping based on stability transition of coupled spins

Research output: Contribution to journalResearch articleContributedpeer-review

Abstract

A bipartite spin system is proposed for which a fast transfer from one defined state into another exists. For sufficient coupling between the spins, this implements a bit-flipping mechanism, which is much faster than that induced by tunneling. The states correspond in the semiclassical limit to equilibrium points with a stability transition from elliptic-elliptic stability to complex instability for increased coupling. The fast transfer is due to the spiraling characteristics of the complex unstable dynamics. Based on the classical system we find an approximate scaling relation for the transfer time, which even applies in the deep quantum regime. By investigating a simple model system, we show that the classical stability transition is reflected in a fundamental change in the structure of the eigenfunctions.

Details

Original languageEnglish
Article numberL022203
Number of pages6
JournalPhysical Review E
Volume108
Issue number2
Publication statusPublished - 16 Jan 2023
Peer-reviewedYes

External IDs

Scopus 85167981538

Keywords