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An alternative derivation of the Pegg-Barnett phase operator is presented. This approach is based on the properties of the representation in quantum mechanics of a nonlinear nonbijective canonical transformation. It does not use as its starting [...]texto impreso
The complex reflected and transmitted amplitudes from a Fabry-Perot interferometer are analysed using a phase-space approach, in which the real and imaginary parts of those amplitudes are taken as basic variables. As functions of the optical pat[...]texto impreso
Two examples are presented where the observation of the emission in parametric down-conversion leads to its enhancement instead of its inhibition. The improvement is analyzed in terms of the quantum features of the observation.texto impreso
The well-known difficulties of defining a phase operator of an oscillator are considered from the point of view of the canonical transformation to action and phase-angle variables. This transformation turns out to be nonbijective, i.e., it is no[...]texto impreso
Lucía Mulas, María Luisa ; Sánchez Quesada, Francisco ; Sánchez Soto, Luis Lorenzo ; Navacerrada, M.A. | American Physical Society | 2005-01The electromagnetic parameters of YBa2Cu3O7-x (YBCO) grain boundary Josephson junctions (JJs) fabricated on four different tilt bicrystal geometries: 12degrees [001] asymmetric, 24degrees [001] symmetric, 24degrees [001] asymmetric, and 45degree[...]texto impreso
Björk, G. ; de Guise, H. ; Klimov, A.B. ; Hoz Iglesias, Pablo de la ; Sánchez Soto, Luis Lorenzo | American Physical Society | 2014-07-23We put forward an operational degree of polarization that can be extended in a natural way to fields whose wave fronts are not necessarily planar. This measure appears as a distance from a state to the set of all of its polarization-transformed [...]texto impreso
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
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Quantum phase difference is used to analyze which-path detectors in which the loss of interference predicted by complementarity cannot be attributed to classical momentum transfer between the interfering particle and the measuring apparatus. It [...]texto impreso
We examine two simple and feasible practical schemes allowing the complete determination of any quantum measuring arrangement. This is illustrated with the example of parity measurement.texto impreso
Bouchard, Frédéric ; Koutný, Dominik ; Hufnagel, Felix ; Hradil, Zdenek ; Rehácek, Jaroslav ; Yong-Siah, Teo ; Ahn, Daekun ; Jeong, Hyunseok ; Sánchez Soto, Luis Lorenzo ; Leuchs, Gerd ; Karimi, Ebrahim | The Optical Society Of America | 2019-06-24The ability to completely characterize the state of a system is an essential element for the emerging quantum technologies. Here, we present a compressed-sensing-inspired method to ascertain any rank-deficient qudit state, which we experimentall[...]texto impreso
We find the observables that-can be determined by two practical schemes based on atom-field resonant interaction. In the first example, the interaction is followed by photon-number and atomic-population measurements. In the second scheme the dir[...]texto impreso
A full quantum analysis of 100% efficient interaction-free measurements is presented. It is shown that it is possible to describe consistently the phenomenon in terms of an effective interaction between object and apparatus that disturbs measura[...]texto impreso
We examine the evolution of a two-level atom when its population is monitored. The detection proposed is an interaction-fret measurement, so that the observation occurs without photon exchange between the atom and the apparatus. It is shown that[...]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[...]
