Magnon qubit on double Bose-Einstein condensate

TL;DR

This paper proposes a magnon qubit based on coupled Bose-Einstein condensates in ferromagnetic samples, analyzing its realization, coherent control, and advantages, drawing parallels to superconducting Josephson qubits.

Contribution

It introduces a novel magnon qubit scheme using double BEC in ferromagnets, with a quantum synchronism condition and effective Hamiltonian similar to Josephson qubits.

Findings

Quantum synchronism condition identified for magnon BEC qubit

Effective Hamiltonian analogous to superconducting Josephson qubit

Feasible implementations in small samples and thin films

Abstract

We have proposed a magnon qubit based on coupled configuration of Bose-Einstein condensates (BEC) in two ferromagnetic samples placed closely to each other. We have evaluated the magnon BEC qubit realization in the double BEC scheme where we found a quantum synchronism condition providing an effective Hamiltonian of magnon qubit. It has the form of well-known superconducting Josephson qubit. The possibilities for coherent magnon BEC qubit rotation are analyzed. Implementations of the magnon BEC qubit are considered for small samples and thin ferromagnetic films. Advantages of the proposed macroscopic qubit realization are discussed.