Physics – Quantum Physics
Scientific paper
2006-10-26
Phys. Rev. A 75, 032316, 2007
Physics
Quantum Physics
12 pages in revtex4
Scientific paper
10.1103/PhysRevA.75.032316
The discrimination of any pair of unknown quantum states is performed by devices processing three parts of inputs: copies of the pair of unknown states we want to discriminate are respectively stored in two program systems and copies of data, which is guaranteed to be one of the unknown states, in a third system. We study the efficiency of such programmable devices with the inputs prepared with $n$ and $m$ copies of unknown qubits used as programs and data, respectively. By finding a symmetry in the average inputs, we apply the Jordan basis method to derive their optimal unambiguous discrimination and the minimum-error discrimination schemes. The dependence of the optimal solutions on the a prior probabilities of the mean input states is also demonstrated.
Bergou Janos A.
He Bing
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