Quantum Zenon effects are discussed in terms of a specific class of quantum trajectories, which are conditioned by continuous, mutually exclusive measurement signals. Such a conditioning is not restricted to simple systems but can be generalized to composite networks. In any case, the characteristic features of these trajectories tend to be washed out in the ensemble limit and thus require single system analysis. Only on a sufficiently small time-scale and for a coherent initial state, also the ensemble exhibits some Zenon effect. In this case, ironically, actual measurements are not required: a closed single composite system can emulate this behavior. Such a kind of quantum parallelism underlies also recent proposals for quantum computation.
|Number of pages||14|
|Journal||European Physical Journal D|
|Publication status||Published - 1998|