Quantum process tomography of unitary and near-unitary maps
Quantum process tomography of unitary and near-unitary maps
We study quantum process tomography given the prior information that the map is a unitary or close to a unitary process. We show that a unitary map on a $d$-level system is completely characterized by a minimal set of ${d}^{2}+d$ elements associated with a collection of POVMs, in contrast to …