Enhanced estimation of a noisy quantum channel using entanglement
Dietmar Fischer, Holger Mack, M. A. Cirone, Matthias Freyberger · Physical Review A · 2001
We discuss the estimation of channel parameters for a noisy quantum channel---the so-called Pauli channel---using finite resources. It turns out that prior entanglement considerably enhances the fidelity of the estimation when we compare it to an estimation scheme based on separable quantum states.