  We propose that space-time results from collapse of the wave function of
macroscopic objects, in quantum dynamics. We first argue that there ought to
exist a formulation of quantum theory which does not refer to classical time.
We then propose such a formulation by invoking an operator Minkowski space-time
on the Hilbert space. We suggest relativistic spontaneous localisation as the
mechanism for recovering classical space-time from the underlying theory.
Quantum interference in time could be one possible signature for operator time,
and in fact may have been already observed in the laboratory, on attosecond
time scales. A possible prediction of our work seems to be that interference in
time will not be seen for `time slit' separations significantly larger than 100
attosecond, if the ideas of operator time and relativistic spontaneous
localisation are correct.
