  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.
