2002/03/22 by Masahide Sasaki, Masashi Ban, Stephen M. Barnett · 1 citation
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physreva.66.022308
published as Phys. Rev. A66, 022308 (2002). · 7 pages, RevTeX4, 5 figures
arxiv created 2002/03/22 · arxiv updated 2009/12/01
We investigate strategies for estimating a depolarizing channel for a finite dimensional system. Our analysis addresses the double optimization problem of selecting the best input probe state and the measurement strategy that minimizes the Bayes cost of a quadratic function. In the qubit case, we derive the Bayes optimal strategy for any finite number of input probe particles when bipartite entanglement can be formed in the probe particles.