Optimal parameter estimation of a depolarizing channel

Masashi Ban, Stephen M. Barnett, Masahide Sasaki

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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.
Original languageEnglish
Article number022308
Number of pages7
JournalPhysical Review A
Issue number2
Publication statusPublished - 15 Aug 2002


  • parameter estimation
  • optics
  • Bayes
  • particles
  • depolarizing
  • physics

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