Data from: Determining ground-state phase diagrams on quantum computers via a generalized application of adiabatic state preparation

Quantum phase transitions materialize as level crossings in the
ground-state energy when the parameters of the Hamiltonian are varied. The
resulting ground-state phase diagrams are straightforward to determine by
exact diagonalization on classical computers, but are challenging on
quantum computers because of the accuracy needed and the near degeneracy
of competing states close to the level crossings. In this work, we use a
local adiabatic ramp for state preparation to allow us to directly compute
ground-state phase diagrams on a quantum computer via time evolution. This
methodology is illustrated by examining the ground states of the XY model
with a magnetic field in the z-direction in one dimension. We are able to
calculate an accurate phase diagram on both two and three site systems
using IBM quantum machines.