  Motivated by the recent experiments [H. Kadau et al., Nature (London) 530,
194 (2016); I. Ferrier-Barbut et al., arXiv:1601.03318] and theoretical
prediction (F. W\"achtler and L. Santos, arXiv:1601.04501), the ground state of
a dysprosium Bose-Einstein condensate with strong dipole-dipole interaction is
studied using the path-integral Monte Carlo method. It is shown that quantum
fluctuation can stabilize the condensate against dipolar collapse.
