Physics – Quantum Physics
Scientific paper
2003-12-19
Proceedings of the 8th ICSSUR, Rinton Press 2003
Physics
Quantum Physics
8 pages, talk delivered at the 8th ICSSUR, Puebla (Mexico)
Scientific paper
We analyse the reconstruction of an unknown pure qubit state. We derive the optimal guess that can be inferred from any set of measurements on N identical copies of the system with the fidelity as a figure of merit. We study in detail the estimation process with individual von Neumann measurements and demonstrate that they are very competitive as compared to (complicated) collective measurements. We compute the expressions of the fidelity for large $N$ and show that individual measurement schemes can perform optimally in the asymptotic regime.
Bagan Emili
Baig M.
Monras Alex
Munoz-Tapia Ramon
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