We discuss the tomography of N-qubit states using collective measurements. The method is exact for symmetric states, whereas for not completely symmetric states the information accessible can be arranged as a mixture of irreducible SU(2) blocks. For the fully symmetric sector, the reconstruction protocol can be reduced to projections onto a canonically chosen set of pure states.
@article{arxiv.1809.04816,
title = {Tomography from collective measurements},
author = {A. Muñoz and A. B. Klimov and M. Grassl and L. L. Sanchez-Soto},
journal= {arXiv preprint arXiv:1809.04816},
year = {2018}
}
Comments
Accepted for publication in Quantum Information Processing