Articles publicats

Articles publicats 5 registres trobats  La cerca s'ha fet en 0.01 segons. 
1.
5 p, 72.8 KB Secrecy properties of quantum channels / Acín, Antonio (Institut de Ciències Fotòniques (Castelldefels, Catalunya)) ; Bae, J. (Institut de Ciències Fotòniques (Castelldefels, Catalunya)) ; Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física) ; Baig i Aleu, Marià, 1955- (Universitat Autònoma de Barcelona. Departament de Física) ; Masanes, Ll. (Universitat de Barcelona. Departament d'Estructura i Constituents de la Matèria) ; Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
We identify those properties of a quantum channel that are relevant for cryptography. We focus on general key distribution protocols that use prepare and measure schemes and the existing classical reconciliation techniques, as these are the protocols feasible with current technology. [...]
2006 - 10.1103/PhysRevA.73.012327
Physical review. A, Vol. 73, Issue 1 (January 2006) , p. 012327-1-012327-5  
2.
6 p, 97.0 KB Relative states, quantum axes, and quantum references / Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física) ; Iblisdir, S. (Université de Genève. GAP-Optique) ; Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
We address the problem of measuring the relative angle between two "quantum axes" made out of N1 and N2 spins. Closed forms of our fidelitylike figure of merit are obtained for an arbitrary number of parallel spins. [...]
2006 - 10.1103/PhysRevA.73.022341
Physical review. A, Vol. 73, Issue 2 (February 2006) , p. 022341-1-22341-6  
3.
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  
4.
10 p, 172.5 KB Inelastic scattering of light by a cold trapped atom : effects of the quantum center-of-mass motion / Bienert, Marc (Universidad Nacional Autónoma de México. Instituto de Ciencias Físicas) ; Merkel, Wolfgang (Universität Ulm. Abteilung für Quantenphysik) ; Morigi, Giovanna (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
The light scattered by a cold trapped ion, which is in the stationary state of laser cooling, presents features due to the mechanical effects of atom-photon interactions. These features appear as additional peaks (sidebands) in the spectrum of resonance fluorescence. [...]
2006 - 10.1103/PhysRevA.73.033402
Physical review. A, Vol. 73, Issue 3 (March 2006) , p. 033402-1-033402-10  
5.
11 p, 255.7 KB Coherent generation of EPR-entangled light pulses mediated by a single trapped atom / Morigi, Giovanna (Universitat Autònoma de Barcelona. Departament de Física) ; Eschner, Jürgen (Institut de Ciencies Fotòniques (Castelldefels, Catalunya)) ; Mancini, Stefano (Università di Camerino. Dipartimento di Fisica) ; Vitali, David (Università di Camerino. Dipartimento di Fisica) ; American Physical Society
We show that a single, trapped, laser-driven atom in a high-finesse optical cavity allows for the quantum-coherent generation of entangled light pulses on demand. We report the detailed description of schemes for generating simultaneous and temporally separated pulse pairs, presented in [G. [...]
2006 - 10.1103/PhysRevA.73.033822
Physical review. A, Vol. 73, Issue 3 (March 2006) , p. 033822-1-033822-11  

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