Physics – Quantum Physics
Scientific paper
2007-02-23
Phys. Rev. A 75, 062101 (2007)
Physics
Quantum Physics
9 pages, 3 figures, v2: small changes, to appear in PRA
Scientific paper
10.1103/PhysRevA.75.062101
Given a single copy of a mixed state of the form \rho=\lambda\rho_1+(1-\lambda)\rho_2, what is the optimal measurement to estimate the parameter \lambda, if \rho_1 and \rho_2 are known? We present a general strategy to obtain the optimal measurements employing a Bayesian estimator. The measurements are chosen to minimize the deviation between the estimated- and the true value of \lambda. We explicitly determine the optimal measurements for a general two-dimensional system and for important higher dimensional cases.
Audretsch Jürgen
Briegel Hans J.
Gühne Otfried
Konrad Thomas
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