Detection of energy levels of a spin system on a quantum computer by
  probe spin evolution
We propose a method for detection of energy levels of arbitrary spin system
on a quantum computer based on studies of evolution of only one probe spin. On
the basis of the proposed method energy levels of spin systems are found on
IBM's quantum computer ibmq-bogota, among them are spin chain in magnetic
field, triangle spin cluster, Ising model on squared lattice in magnetic field.
The results of quantum calculations are in agreement with the theoretical ones.
The method is efficient for estimation of the energy levels of many-spin
systems and opens a possibility to achieve quantum supremacy in solving
eigenvalue problem with development of multi-qubit quantum computers.
Kh. P. Gnatenko H. P. Laba V. M. Tkachuk