Página principal > Artículos > Resultados de la búsqueda: Bagán Capella, Emili

Artículos

  Consejos para la búsqueda
Búsqueda avanzada
Buscar colecciones:
Ordenar por: Mostrar resultados: Formato de visualización:
Artículos Encontrados 31 registros  anterior11 - 20siguientefinal  ir al registro: La búsqueda tardó 0.01 segundos. 
11.
10 p, 167.8 KB Quantum field theory of photons with orbital angular momentum / Fernández Calvo, Gabriel (Universitat Autònoma de Barcelona. Departament de Física) ; Picón Álvarez, Antonio (Universitat Autònoma de Barcelona. Departament de Física) ; Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
A quantum-field-theory approach is put forward to generalize the concept of classical spatial light beams carrying orbital angular momentum to the single-photon level. This quantization framework is carried out both in the paraxial and nonparaxial regimes. [...]
2006 - 10.1103/PhysRevA.73.013805
Physical review. A, Vol. 73, Issue 1 (January 2006) , p. 013805-1-013805-10  
Registro completo -
12.
18 p, 221.7 KB Optimal full estimation of qubit mixed states / Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física) ; Ballester, M. A. (University of Utrecht. Department of Mathematics) ; Gill, R. D. (University of Utrecht. Department of Mathematics) ; Monras Blasi, Àlex (Universitat Autònoma de Barcelona. Departament de Física) ; Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
We obtain the optimal scheme for estimating unknown qubit mixed states when an arbitrary number N of identically prepared copies is available. We discuss the case of states in the whole Bloch sphere as well as the restricted situation where these states are known to lie on the equatorial plane. [...]
2006 - 10.1103/PhysRevA.73.032301
Physical review. A, Vol. 73, Issue 3 (March 2006) , p. 032301-1-32301-18  
Registro completo -
13.
7 p, 149.9 KB Phase variance of squeezed vacuum states / Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física) ; Monras Blasi, Àlex (University of Leeds. The School of Physics and Astronomy) ; Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
We consider the problem of estimating the phase of squeezed vacuum states within a Bayesian framework. We derive bounds on the average Holevo variance for an arbitrary number N of uncorrelated copies. [...]
2008 - 10.1103/PhysRevA.78.043829
Physical review. A, Vol. 78, Issue 4 (October 2008) , p. 043829-1-043829-7  
Registro completo -
14.
15 p, 258.8 KB Quantum Chernoff bound as a measure of distinguishability between density matrices : application to qubit and Gaussian states / Calsamiglia Costa, John (Universitat Autònoma de Barcelona. Departament de Física) ; Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física) ; Masanes, Ll. (University of Cambridge. Department of Applied Mathematics and Theoretical Physics) ; Acín, Antonio (Institut de Ciències Fotòniques) ; Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física)
Hypothesis testing is a fundamental issue in statistical inference and has been a crucial element in the development of information sciences. The Chernoff bound gives the minimal Bayesian error probability when discriminating two hypotheses given a large number of observations. [...]
2008 - 10.1103/PhysRevA.77.032311
Physical review. A, Vol. 77, Issue 3 (March 2008) , p. 032311-1-032311-15  
Registro completo -
15.
12 p, 248.6 KB Phase estimation for thermal Gaussian states / Aspachs Bracons, Mariona (Universitat Autònoma de Barcelona. Departament de Física) ; Calsamiglia Costa, John (Universitat Autònoma de Barcelona. Departament de Física) ; Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física) ; Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física)
We give the optimal bounds on the phase-estimation precision for mixed Gaussian states in the single-copy and many-copy regimes. Specifically, we focus on displaced thermal and squeezed thermal states. [...]
2009 - 10.1103/PhysRevA.79.033834
Physical review. A, Vol. 79, Issue 3 (March 2009) , p. 033834-1-033834-12  
Registro completo -
16.
4 p, 114.7 KB Phase-covariant quantum benchmarks / Calsamiglia Costa, John (Universitat Autònoma de Barcelona. Departament de Física) ; Aspachs Bracons, Mariona (Universitat Autònoma de Barcelona. Departament de Física) ; Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física) ; Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
We give a quantum benchmark for teleportation and quantum storage experiments suited for pure and mixed test states. The benchmark is based on the average fidelity over a family of phase-covariant states and certifies that an experiment cannot be emulated by a classical setup, i. [...]
2009 - 10.1103/PhysRevA.79.050301
Physical review. A, Vol. 79, Issue 5 (May 2009) , p. 050301-1-050301-4  
Registro completo -
17.
11 p, 323.2 KB Multicopy programmable discrimination of general qubit states / Sentís Herrera, Gael (Universitat Autònoma de Barcelona. Departament de Física) ; Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física) ; Calsamiglia Costa, John (Universitat Autònoma de Barcelona. Departament de Física) ; Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
Quantum state discrimination is a fundamental primitive in quantum statistics where one has to correctly identify the state of a system that is in one of two possible known states. A programmable discrimination machine performs this task when the pair of possible states is not a priori known but instead the two possible states are provided through two respective program ports. [...]
2010 - 10.1103/PhysRevA.82.042312
Physical review. A, Vol. 82, Issue 4 (October 2010) , p. 042312-1-042312-11  
Registro completo -
18.
12 p, 253.3 KB Estimation of quantum finite mixtures / de Vicente Majúa, Julio Íñigo (Universitat Autònoma de Barcelona. Departament de Física) ; Calsamiglia Costa, John (Universitat Autònoma de Barcelona. Departament de Física) ; Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física) ; Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
We consider the problem of determining the weights of a quantum ensemble. That is to say, given a quantum system that is in a set of possible known states according to an unknown probability law, we give strategies to estimate the individual probabilities, weights, or mixing proportions. [...]
2010 - 10.1103/PhysRevA.81.012332
Physical review. A, Vol. 81, Issue 1 (January 2010) , p. 012332-1-012332-12  
Registro completo -
19.
16 p, 310.2 KB Scavenging quantum information : multiple observations of quantum systems / Rapčan, Peter (Slovak Academy of Sciences. Institute of Physics) ; Calsamiglia Costa, John (Universitat Autònoma de Barcelona. Departament de Física) ; Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física) ; Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física) ; Bužek, Vladimir (Slovak Academy of Sciences. Institute of Physics) ; American Physical Society
Given an unknown state of a qudit that has already been measured optimally, can one still extract any information about the original unknown state? Clearly, after a maximally informative measurement, the state of the system collapses into a postmeasurement state from which the same observer cannot obtain further information about the original state of the system. [...]
2011 - 10.1103/PhysRevA.84.032326
Physical review. A, Vol. 84, Issue 3 (September 2011) , p. 032326-1-032326-16  
Registro completo -
20.
7 p, 200.6 KB Programmable discrimination with an error margin / Sentís Herrera, Gael (Universitat Autònoma de Barcelona. Departament de Física) ; Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física) ; Calsamiglia Costa, John (Universitat Autònoma de Barcelona. Departament de Física) ; Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
The problem of optimally discriminating between two completely unknown qubit states is generalized by allowing an error margin. It is visualized as a device-the programmable discriminator-with one data and two program ports, each fed with a number of identically prepared qubits-the data and the programs. [...]
2013 - 10.1103/PhysRevA.88.052304
Physical review. A, Vol. 88, Issue 5 (November 2013) , p. 052304-1-052304-7  
Registro completo -

Artículos : Encontrados 31 registros   anterior11 - 20siguientefinal  ir al registro:
¿Le interesa recibir alertas sobre nuevos resultados de esta búsqueda?
Defina una alerta personal vía correo electrónico o subscríbase al canal RSS.
Depósito Digital de Documentos de la UAB :: Buscar :: Enviar :: Personalizar :: Ayuda
Powered by Invenio v1.1.6
Mantenido por ddd.bib@uab.cat  :: Metadatos sujetos a:
Colaboramos