Optimal realization of the transposition maps
F. Buscemi, G. M. D'Ariano, P. Perinotti, M. F. Sacchi
Abstract
We solve the problem of achieving the optimal physical approximation of the transposition for pure states of arbitrary quantum systems for finite and infinite dimensions. A unitary realization is also given for any finite dimension, which provides the optimal quantum cloning map of the ancilla as well.
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