  A method of quantum annealing (QA) using Kerr-nonlinear parametric
oscillators (KPOs) was proposed. This method is described by bosonic operators
and has different characteristics from QA based on the transverse-field Ising
model. As the first step to describe this method in the conventional framework
of QA, we propose effective spin models of KPOs. The spin models are obtained
via a variant of the Holstein-Primakoff transformation and are described by
spin-$s$ operators. The terms for detuning, coherent driving, parametric
driving, and the Kerr effect are mapped to the transverse field, longitudinal
field, nonlinear terms for the z- and x-components of spins, respectively. By
analyzing the spin models corresponding to KPOs in several settings, we
demonstrate that the present spin models for a rather large $s$ and tuned
parameters qualitatively reproduce behavior of KPOs.
