State tomography of a qubit through scattering of a probe qubit
Antonella De Pasquale, Kazuya Yuasa, Hiromichi Nakazato · Physical Review A · 2009
We discuss the state tomography of a fixed qubit (a spin-1/2 target particle), which is in general in a mixed state, through one-dimensional scattering of a probe qubit off the target. Two strategies are presented by making use of different degrees of freedom of the probe, i.e. spin and momentum. Remarkably, the spatial degree of freedom of the probe can be utilized for optimizing the tomographic schemes.