  A new method for stochastic unraveling of general time-local quantum master
equations (QME) which involve the reduced density operator at time t only is
proposed. The present kind of jump algorithm enables a numerically efficient
treatment of QMEs which are not of Lindblad form. So it opens new large fields
of application for stochastic methods. The unraveling can be achieved by
allowing for trajectories with negative weight. We present results for the
quantum Brownian motion and the Redfield QMEs as test examples. The algorithm
can also unravel non-Markovian QMEs when they are in a time-local form like in
the time-convolutionless formalism.
