Cloning of symmetric d -level photonic states in physical systems
Heng Fan, Gregor Weihs, Keiji Matsumoto, Hiroshi Imai · Physical Review A · 2002
Optimal procedures play an important role in quantum information. It turns out that some naturally occurring processes as emission of light from an atom can realize optimal transformations. Here we study how arbitrary symmetric states of a number of d-level systems can be cloned using a multilevel atomic system. It is shown that optimality is always ensured even though the output number of systems is probabilistic.