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Björk, G. ; Klimov, A. B. ; Hoz Iglesias, Pablo de la ; Grassl, M. ; Leuchs, G. ; Sánchez Soto, Luis Lorenzo | American Physical Society | 2015-09-01The characterization of quantum polarization of light requires knowledge of all the moments of the Stokes variables, which are appropriately encoded in the multipole expansion of the density matrix. We look into the cumulative distribution of th[...]texto impreso
Klimov, A. B. ; Seyfarth, Ulrich ; de Guise, Hubert ; Sánchez Soto, Luis Lorenzo | IOP Publishing Ltd. | 2021-01-18We propose a practical recipe to compute the s-parametrized maps for systems with SU(1, 1) symmetry using a connection between the Q- and P-symbols through the action of an operator invariant under the group. This establishes equivalence relatio[...]texto impreso
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.[...]texto impreso
Hoz Iglesias, Pablo de la ; Björk, G. ; Klimov, A. B. ; Leuchs, G. ; Sánchez Soto, Luis Lorenzo | American Physical Society | 2014-10-15We capitalize on a multipolar expansion of the polarization density matrix, in which multipoles appear as successive moments of the Stokes variables. When all the multipoles up to a given order K vanish, we can properly say that the state isKth-[...]
