  We propose a concept for reservoir computing on oscillators using the
high-order synchronization effect. The reservoir output is presented in the
form of oscillator synchronization metrics: fractional high-order
synchronization value and synchronization efficiency, expressed as a
percentage. Using two coupled relaxation oscillators built on VO2 switches, we
created an oscillator reservoir that allows simulating the XOR operation. The
reservoir can operate as with static input data (power currents, coupling
forces), as with dynamic data in the form of spike sequences. Having a small
number of oscillators and significant non-linearity, the reservoir expresses a
wide range of dynamic states. The proposed computing concept can be implemented
on oscillators of diverse nature.
