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Di Matteo, Olivia ; Sánchez Soto, Luis Lorenzo ; Leuchs, G. ; Grassl, M. | Amer Physical Soc | 2017-02-28We develop a systematic coarse-graining procedure for systems of N qubits. We exploit the underlying geometrical structures of the associated discrete phase space to produce a coarse-grained version with reduced effective size. Our coarse-graine[...]texto impreso
Müller, C. R. ; Peuntinger, P. ; Dirmeier, T. ; Khan, I. ; Vogl, U. ; Leuchs, G. ; Sánchez Soto, Luis Lorenzo ; Teo, Y. S. ; Hradil, Zdenek ; ?ehá?ek, J. | American Physical Society | 2016-08-11The accuracy in determining the quantum state of a system depends on the type of measurement performed. Homodyne and heterodyne detection are the two main schemes in continuous-variable quantum information. The former leads to a direct reconstru[...]texto impreso
Bent, N. ; Qassim, H. ; Tahir, A. A. ; Sych, D. ; Leuchs, G. ; Sánchez Soto, Luis Lorenzo ; Karimi, E. ; Boyd, R. W. | American Physical Society | 2015-10-15Symmetric informationally complete positive operator-valued measures provide efficient quantum state tomography in any finite dimension. In this work, we implement state tomography using symmetric informationally complete positive operator-value[...]texto impreso
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
Hradil, Z. ; ?ehá?ek, J. ; Hoz Iglesias, Pablo de la ; Leuchs, G. ; Sánchez Soto, Luis Lorenzo | American Physical Society | 2015-04-27Rotated quadratures carry the phase-dependent information of the electromagnetic field, so they are somehow conjugate to the photon number. We analyze this noncanonical pair, finding an exact uncertainty relation, as well as a couple of weaker i[...]texto impreso
Trautmann, N. ; Bernád, J. Z. ; Sondermann, M. ; Alber, G. ; Sánchez Soto, Luis Lorenzo ; Leuchs, G. | American Physical Society | 2014We propose a scheme for the remote preparation of entangled matter qubits in free space. For this purpose, a setup of two opposing parabolic mirrors is considered, each one with a single ion trapped at its focus. To get the required entanglement[...]texto impreso
Karimi, E. ; Boyd, R.W. ; Hoz Iglesias, Pablo de la ; de Guise, H. ; ?ehá?ek, J. ; Hradil, Z. ; Aiello, A. ; Leuchs, G. ; Sánchez Soto, Luis Lorenzo | American Physical Society | 2014-06-16We introduce an operator linked with the radial index in the Laguerre-Gauss modes of a two-dimensional harmonic oscillator in cylindrical coordinates. We discuss ladder operators for this variable, and confirm that they obey the commutation rela[...]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-[...]
