We consider the unambiguous discrimination between two unknown qudit states in n-dimensional (n ≥ 2) Hilbert space. By equivalence of unknown pure states to known mixed states and with the Jordan-basis method, we demonstrate that the optimal success probability of the discrimination between two unknown states is independent of the dimension n. We also give a scheme for a physical implementation of the programmable state discriminator that can unambiguously discriminate between two unknown states with optimal probability of success.
Quantum Information Processing – Springer Journals
Published: Nov 9, 2011
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