Classical analog of qubit logic based on a magnon Bose–Einstein condensate

• DOI: 10.1038/s42005-022-00970-8
• Publication Date: 2022-08-01T18:25:12Z
• Authors: Morteza Mohseni; Vitaliy I. Vasyuchka; Victor S. L’vov; Alexander A. Serga; Burkard Hillebrands
• Keywords: QB460-466; 0301 basic medicine; Quantum Physics; 03 medical and health sciences; Condensed Matter - Mesoscale and Nanoscale Physics; Physics; QC1-999; Mesoscale and Nanoscale Physics (cond-mat.mes-hall); FOS: Physical sciences; Astrophysics; Quantum Physics (quant-ph)

AbstractAdvances in quantum computing and telecommunications stimulate the search for classical systems allowing partial implementation of a similar functionality under less stringent environmental conditions. Here, we present a classical version of several quantum bit (qubit) functionalities using a two-component magnon Bose–Einstein condensate (BEC) formed at opposite wavevectors in a room-temperature yttrium-iron-garnet ferrimagnetic film. Employing micromagnetic numerical simulations, we show the use of wavelength-selective parametric pumping to controllably initialize and manipulate the two-component BEC. Next, by modeling the interaction of this BEC with a pulse- and radio-frequency-driven dynamic magnonic crystal we translate the concept of Rabi-oscillations into the wavevector domain and demonstrate how to manipulate the magnon-BEC system regarding the polar and azimuthal angles in the Bloch sphere representation. We hope that our study provides a significant stimulus on the boundary between qubit functionality and classical systems of interacting BECs, which use a subset of qubit-based algorithms.