  We show how detailed properties of a kink in quantum field theory can be
extracted from field correlation functions. This makes it possible to study
quantum kinks in a fully non-perturbative way using Monte Carlo simulations. We
demonstrate this by calculating the kink mass as well as the spectrum and
approximate wave functions of its excitations. This way of measuring the kink
mass has clear advantages over the existing approaches based on creation and
annihilation operators or the kink free energy. Our methods are straightforward
to generalise to more realistic theories and other defect types.
