Optimal estimation of one parameter quantum channels
نویسنده
چکیده
We explore the task of optimal quantum channel identification, and in particular the estimation of a general one parameter quantum process. We derive new characterizations of optimality and apply the results to several examples including the qubit depolarizing channel and the harmonic oscillator damping channel. We also discuss the geometry of the problem and illustrate the usefulness of using entanglement in process estimation. PACS numbers: 03.65.Ta, 03.67.-a Submitted to: J. Phys. A: Math. Gen. Optimal estimation of one parameter quantum channels 2
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