  The impossibility to clone an unknown quantum state is a powerful principle
to understand the nature of quantum mechanics, especially within the context of
quantum computing and quantum information. This principle has been generalized
to quantitative statements as to what extent imperfect cloning is possible. We
delineate an aspect of the border between the possible and the impossible
concerning quantum cloning, by putting forward an entanglement-assisted scheme
for simulating perfect cloning in the context of weak measurements. This
phenomenon we call weak cloning of an unknown quantum state.
