Articles

Articles 32 records found  beginprevious22 - 31next  jump to record: Search took 0.00 seconds. 
22.
7 p, 824.8 KB Dipole spectrum structure of nonresonant nonpertubative driven two-level atoms / Picón Álvarez, Antonio (Universitat Autònoma de Barcelona. Departament de Física) ; Roso, Luis (Centro de Láseres Pulsados (Salamanca, Castella i Lleó)) ; Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ; Varela, O. (Universidad de Salamanca. Departamento de Física Aplicada) ; Ahufinger, Verònica (Universitat Autònoma de Barcelona. Departament de Física) ; Corbalán, R. (Ramón) (Universitat Autònoma de Barcelona. Departament de Física) ; Plaja, L. (Universidad de Salamanca. Departamento de Física Aplicada) ; American Physical Society
We analyze the dipole spectrum of a two-level atom excited by a nonresonant intense monochromatic field under the electric dipole approximation and beyond the rotating wave approximation. We show that the apparently complex spectral structure can be completely described by two families: harmonic frequencies of the driving field and field-induced nonlinear fluorescence. [...]
2010 - 10.1103/PhysRevA.81.033420
Physical review. A, Vol. 81, Issue 3 (March 2010) , p. 033420-1-033420-7  
23.
8 p, 806.0 KB Adiabatic splitting, transport, and self-trapping of a Bose-Einstein condensate in a double-well potential / Ottaviani, Carlo (Universitat Autònoma de Barcelona. Departament de Física) ; Ahufinger, Verònica (Universitat Autònoma de Barcelona. Departament de Física) ; Corbalán, R. (Ramón) (Universitat Autònoma de Barcelona. Departament de Física) ; Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
We show that the adiabatic dynamics of a Bose-Einstein condensate (BEC) in a double-well potential can be described in terms of a dark variable resulting from the combination of the population imbalance and the spatial atomic coherence between the two wells. [...]
2010 - 10.1103/PhysRevA.81.043621
Physical review. A, Vol. 81, Issue 4 (April 2010) , p. 043621-1-043621-8  
24.
7 p, 561.1 KB Filtering of matter-wave vibrational states via spatial adiabatic passage / Loiko, Yury (National Academy of Sciences of Belarus. Institute of Physics) ; Ahufinger, Verònica (Universitat Autònoma de Barcelona. Departament de Física) ; Corbalán, R. (Ramón) (Universitat Autònoma de Barcelona. Departament de Física) ; Birkl, Gerhard (Universität Darmstadt. Institut für Angewandte Physik, Technische) ; Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
We discuss the filtering of the vibrational states of a cold atom in an optical trap by chaining this trap with two empty ones and adiabatically controlling the tunneling. Matter-wave filtering is performed by selectively transferring the population of the highest populated vibrational state to the most distant trap while the population of the rest of the states remains in the initial trap. [...]
2011 - 10.1103/PhysRevA.83.033629
Physical review. A, Vol. 83, Issue 3 (March 2011) , p. 033629-1-033629-7  
25.
8 p, 406.5 KB Quantum-state storage and processing for polarization qubits in an inhomogeneously broadened Λ-type three-level medium / Viscor, Daniel (Universitat Autònoma de Barcelona. Departament de Física) ; Ferraro, Alessandro (Universitat Autònoma de Barcelona. Departament de Física) ; Loiko, Yury (National Academy of Sciences of Belarus. Institute of Physics) ; Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ; Ahufinger, Verònica (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
We address the propagation of a single-photon pulse with two polarization components, i. e. , a polarization qubit, in an inhomogeneously broadened “phaseonium” Λ-type three-level medium. We combine some of the nontrivial propagation effects characteristic for this kind of coherently prepared systems and the controlled reversible inhomogeneous broadening technique to propose several quantum information-processing applications, such as a protocol for polarization qubit filtering and sieving as well as a tunable polarization beam splitter. [...]
2011 - 10.1103/PhysRevA.84.042314
Physical review. A, Vol. 84, Issue 4 (October 2011) , p. 042314-1-042314-8  
26.
8 p, 2.8 MB Two-color quantum memory in double-Λ media / Viscor, Daniel (Universitat Autònoma de Barcelona. Departament de Física) ; Ahufinger, Verònica (Universitat Autònoma de Barcelona. Departament de Física) ; Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ; Zavatta, Alessandro (European Laboratory for Nonlinear Spectroscopy (Florència, Itàlia)) ; La Rocca, Giuseppe (Scuola Normale Superiore (Pisa, Itàlia)) ; Artoni, Maurizio (Brescia University. Department of Physics and Chemistry of Materials) ; American Physical Society
We propose a quantum memory for a single-photon wave packet in a superposition of two different colors, i. e. , two different frequency components, using the electromagnetically induced transparency technique in a double-Λ system. [...]
2012 - 10.1103/PhysRevA.86.053827
Physical review. A, Vol. 86, Issue 5 (November 2012) , p. 053827-1-053827-8  
27.
7 p, 396.1 KB Single-site addressing of ultracold atoms beyond the diffraction limit via position-dependent adiabatic passage / Viscor, Daniel (Universitat Autònoma de Barcelona. Departament de Física) ; Rubio López, Juan Luis (Universitat Autònoma de Barcelona. Departament de Física) ; Birkl, Gerhard (Universität Darmstadt. Institut für Angewandte Physik, Technische) ; Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ; Ahufinger, Verònica (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
We propose a single-site addressing implementation based on the subwavelength localization via adiabatic passage (SLAP) technique. We consider a sample of ultracold neutral atoms loaded into a two-dimensional optical lattice with one atom per site. [...]
2012 - 10.1103/PhysRevA.86.063409
Physical review. A, Vol. 86, Issue 6 (December 2012) , p. 063409-1-063409-7  
28.
5 p, 1.1 MB Need for relativistic corrections in the analysis of spatial adiabatic passage of matter waves / Benseny, Antoni (Universitat Autònoma de Barcelona. Departament de Física) ; Bagudà, Joan (Universitat Autònoma de Barcelona. Departament de Física) ; Oriols Pladevall, Xavier (Universitat Autònoma de Barcelona. Departament d’Enginyeria Electrònica) ; Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
We investigate the coherent transport of a single particle and a Bose-Einstein condensate between the two extreme traps of a triple-well potential by means of the spatial adiabatic passage technique. [...]
2012 - 10.1103/PhysRevA.85.053619
Physical review. A, Vol. 85, Issue 5 (May 2012) , p. 053619-1-053619-5  
29.
4 p, 219.3 KB Cavity solitons in two-level lasers with dense amplifying medium / Ahufinger, Verònica (Universitat Autònoma de Barcelona. Departament de Física) ; García Ojalvo, J. (Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear) ; Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ; Torrent, M. C. (Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear) ; Corbalán, R. (Ramón) (Universitat Autònoma de Barcelona. Departament de Física) ; Vilaseca, Ramon (Universitat Politècnica de Catalunya. Department de Física i Enginyeria Nuclear) ; American Physical Society
Local-field effects are known to induce bistability in dense optical media. We examine theoretically whether this property is preserved in broad-area cavities, and show that bistability between the homogeneous lasing and nonlasing states of the system persists provided a Fourier filtering technique is used to prevent off-axis emission. [...]
2003 - 10.1103/PhysRevLett.91.083901
Physical review letters, Vol. 91, Issue 8 (August 2003) , p. 083901  
30.
4 p, 200.7 KB Quantum computing with spatially delocalized qubits / Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ; Eckert, Kai (University of Hannover. Institute of Theoretical Physics) ; Ertmer, W. (University of Hannover. Institute of Quantum Optics) ; Birkl, Gerhard (University of Hannover. Institute of Quantum Optics) ; Lewenstein, Maciej (University of Hannover. Institute of Theoretical Physics) ; American Physical Society
We analyze the operation of quantum gates for neutral atoms with qubits that are delocalized in space, i. e. , the computational basis states are defined by the presence of a neutral atom in the ground state of one out of two trapping potentials. [...]
2003 - 10.1103/PhysRevLett.90.147901
Physical review letters, Vol. 90, Issue 14 (April 2003) , p. 147901  
31.
4 p, 94.5 KB Coherent population trapping in two-electron three-level systems with aligned spins / Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ; Corbalán, R. (Ramón) (Universitat Autònoma de Barcelona. Departament de Física) ; Roso, Luis (Universidad de Salamanca. Departamento de Física Aplicada) ; American Physical Society
The possibility of coherent population trapping in two electron states with aligned spins (orthosystem) is evidenced. From the analysis of a three-level atomic system containing two electrons, and driven by the two laser fields needed for coherent population trapping, a conceptually new kind of dark state appears. [...]
2002 - 10.1103/PhysRevLett.88.023603
Physical review letters, Vol. 88, Issue 2 (December 2001) , p. 023603  

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