Optimal parameter estimation of depolarizing channel

Details Optimal parameter estimation of depolarizing channel Optimal parameter estimation of depolarizing channel

2002-03-22

arxiv.org/abs/quant-ph/0203113v1

Phys. Rev. A66, 022308 (2002).

Physics

Quantum Physics

7 pages, RevTeX4, 5 figures

Scientific paper

10.1103/PhysRevA.66.022308

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.

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