Abstract
We investigate the optimal distribution of quantum information over multipartite systems in asymmetric settings. We introduce cloning transformations that take identical replicas of a pure state in any dimension as input and yield a collection of clones with nonidentical fidelities. As an example, if the clones are partitioned into a set of clones with fidelity and another set of clones with fidelity , the trade-off between these fidelities is analyzed, and particular cases of optimal cloning machines are exhibited. We also present an optimal cloning machine, which is an example of a tripartite fully asymmetric cloner. Finally, it is shown how these cloning machines can be optically realized.
- Received 13 December 2004
DOI:https://doi.org/10.1103/PhysRevA.72.042328
©2005 American Physical Society