  Spin-1 tunneling and splitting of energy levels as a result of tunneling are
observed explicitly on IBM's quantum computer, ibmq-bogota. The spin-1 is
realized with two spins-1/2. We detect oscillations of spin-1 between the
states $|1\rangle$, $|-1\rangle$ in the result of tunneling on the basis of
studies of the time dependence of the mean value of z-component of spin-1 on
the quantum device. The energy level splitting is observed quantifying on the
IBM's quantum computer the eigenvalues of Hamiltonian which describes the spin
tunneling.
