Abstract
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 language | English |
|---|---|
| Article number | 022308 |
| Number of pages | 7 |
| Journal | Physical Review A |
| Volume | 66 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 15 Aug 2002 |
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Keywords
- parameter estimation
- optics
- Bayes
- particles
- depolarizing
- physics
Cite this
Ban, M., Barnett, S. M., & Sasaki, M. (2002). Optimal parameter estimation of a depolarizing channel. Physical Review A, 66(2), [022308]. https://doi.org/10.1103/PhysRevA.66.022308