A Lorentz covariant generalization of quantum state diffusion is const
ructed by associating a Dirac wave function and a Lindblad operator to
each flat, spacelike hypersurface in Minkowski space. The proof of re
lativistic covariance is given and the necessary integrability conditi
on for the stochastic process is derived. (C) 1998 Elsevier Science B.
V.