Articles

Articles 32 records found  previous11 - 20nextend  jump to record: Search took 0.00 seconds. 
11.
8 p, 218.2 KB Lasing without inversion in three-level systems without external coherent driving / Ahufinger, Verònica (Universitat Autònoma de Barcelona. Departament de Física) ; Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ; Corbalán, R. (Ramón) (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
We have studied an incoherently pumped laser operating with a Doppler-broadened three-level system placed in a doubly resonant cavity. This system generates two laser fields, one of them without population inversion. [...]
2000 - 10.1103/PhysRevA.61.053814
Physical review. A, Vol. 61, Issue 5 (April 2000) , p. 053814-1-053814-8  
12.
9 p, 335.8 KB Electromagnetically induced transparency with a standing-wave drive in the frequency up-conversion regime / Silva, F. (Departament d’Òptica, Universitat de València) ; Mompart Penina, Jordi (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) ; American Physical Society
We study electromagnetically induced transparency for a probe traveling-wave (TW) laser field in closed Doppler-broadened three-level systems driven by a standing-wave (SW) laser field of moderate intensity (its Rabi frequencies are smaller than the Doppler width of the driven transition). [...]
2001 - 10.1103/PhysRevA.64.033802
Physical review. A, Vol. 64, Issue 3 (August 2001) , p. 033802-1-033802-9  
13.
12 p, 179.9 KB Generalized Einstein B coefficients for coherently driven three-level systems / Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ; Corbalán, R. (Ramón) (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
Generalized Einstein B coefficients for coherently driven closed three-level systems are introduced by means of the quantum-jump technique. The nonreciprocity between stimulated emission and absorption for both one-photon and two-photon gain and loss processes has been studied and quantified in terms of the rates of the particular incoherent processes present in each three-level system. [...]
2001 - 10.1103/PhysRevA.63.063810
Physical review. A, Vol. 63, Issue 6 (May 2001) , p. 063810-1-063810-12  
14.
11 p, 385.0 KB Quantum computing in optical microtraps based on the motional states of neutral atoms / Eckert, Kai (University of Hannover. Institute of Theoretical Physics) ; Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ; Yi, X. X. (University of Hannover. Institute of Theoretical Physics) ; Schliemann, J. (University of Basel. Department of Physics and Astronomy) ; Bruß, D. (University of Hannover. Institute of Theoretical Physics) ; Birkl, Gerhard (University of Hannover. Institute of Quantum Optics) ; Lewenstein, Maciej (University of Hannover. Institute of Theoretical Physics) ; American Physical Society
We investigate quantum computation with neutral atoms in optical microtraps where the qubit is implemented in the motional states of the atoms, i. e. , in the two lowest vibrational states of each trap. [...]
2002 - 10.1103/PhysRevA.66.042317
Physical review. A, Vol. 66, Issue 4 (October 2002) , p. 042317-1-042317-11  
15.
6 p, 89.7 KB Cavity QED quantum phase gates for a single longitudinal mode of the intracavity field / García Maraver, Rocío (Universitat Autònoma de Barcelona. Departament de Física) ; Corbalán, R. (Ramón) (Universitat Autònoma de Barcelona. Departament de Física) ; Eckert, Kai (University of Hannover. Institut of Theoretical Physics) ; Rebic, S. (Università di Camerino. Dipartimento di Fisica) ; Artoni, M. (European Laboratory for Non-Linear Spectroscopy (Sesto Fiorentino, Itàlia)) ; Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
A single three-level atom driven by a longitudinal mode of a high-Q cavity is used to implement two-qubit quantum phase gates for the intracavity field. The two qubits are associated with the zero- and one-photon Fock states of each of the two opposite circular polarization states of the field. [...]
2004 - 10.1103/PhysRevA.70.062324
Physical review. A, Vol. 70, Issue 6 (December 2004) , p. 062324-1-062324-6  
16.
5 p, 435.2 KB Three-level atom optics via the tunneling interaction / Eckert, Kai (University of Hannover. Institute of Theoretical Physics) ; Lewenstein, Maciej (University of Hannover. Institute of Theoretical Physics) ; Corbalán, R. (Ramón) (Universitat Autònoma de Barcelona. Departament de Física) ; Birkl, Gerhard (University of Hannover. Institute of Quantum Optics) ; Ertmer, W. (University of Hannover. Institute of Quantum Optics) ; Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
Three-level atom optics is introduced as a simple, efficient, and robust method to coherently manipulate and transport neutral atoms. The tunneling interaction among three trapped states allows us to realize the spatial analog of the stimulated Raman adiabatic passage, coherent population trapping, and electromagnetically induced transparency techniques and offers a wide range of possible applications. [...]
2004 - 10.1103/PhysRevA.70.023606
Physical review. A, Vol. 70, Issue 2 (August 2004) , p. 023606-1-023606-5  
17.
9 p, 817.9 KB One- and two-dimensional quantum walks in arrays of optical traps / Eckert, Kai (University of Hannover. Institute of Theoretical Physics) ; Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ; Birkl, Gerhard (Universität Darmstadt. Institut für Angewandte Physik, Technische) ; Lewenstein, Maciej (University of Hannover. Institute of Theoretical Physics) ; American Physical Society
We propose a different implementation of discrete-time quantum walks for a neutral atom in an array of optical microtraps or an optical lattice. We analyze a one-dimensional walk in position space, with the coin, the additional qubit degree of freedom that controls the displacement of the quantum walker, implemented as a spatially delocalized qubit, i. [...]
2005 - 10.1103/PhysRevA.72.012327
Physical review. A, Vol. 72, Issue 1 (July 2005) , p. 012327-1-012327-9  
18.
4 p, 544.2 KB Deterministic cavity-QED source of polarization-entangled photon pairs / García Maraver, Rocío (Universitat Autònoma de Barcelona. Departament de Física) ; Eckert, Kai (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 present two cavity quantum electrodynamics proposals that, sharing the same basic elements, allow for the deterministic generation of entangled photon pairs by means of a three-level atom successively coupled to two single longitudinal mode high-Q optical resonators presenting polarization degeneracy. [...]
2006 - 10.1103/PhysRevA.74.031801
Physical review. A, Vol. 74, Issue 3 (September 2006) , p. 031801-1-031801-4  
19.
9 p, 219.2 KB Ultrashort pulse control of space-dependent excitations in a three-level system / Loiko, Yu. (Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear) ; Serrat, C. (Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear) ; Vilaseca, Ramon (Universitat Politècnica de Catalunya. Department de Física i Enginyeria Nuclear) ; Ahufinger, Verònica (Universitat Autònoma de Barcelona. Departament de Física) ; Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ; Corbalán, R. (Ramón) (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
Coherent control of regions with spatial excitation of populations and coherence between two lower states in three-level Λ-type quantum systems mediated by the self-induced transparency (SIT) phenomenon is theoretically investigated with one- and two-color ultrashort pulses and with pulse sequences beyond the slowly varying envelope (SVEA) and rotating wave (RWA) approximations. [...]
2007 - 10.1103/PhysRevA.75.023801
Physical review. A, Vol. 75, Issue 2 (February 2007) , p. 023801-1-023801-9  
20.
6 p, 683.9 KB Coherent patterning of matter waves with subwavelength localization / Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ; Ahufinger, Verònica (Universitat Autònoma de Barcelona. Departament de Física) ; Birkl, Gerhard (Universität Darmstadt. Institut für Angewandte Physik, Technische) ; American Physical Society
We propose the subwavelength localization via adiabatic passage (SLAP) technique to coherently achieve state-selective patterning of matter waves well beyond the diffraction limit. The SLAP technique consists in coupling two partially overlapping and spatially structured laser fields to three internal levels of the matter wave yielding state-selective localization at those positions where the adiabatic passage process does not occur. [...]
2009 - 10.1103/PhysRevA.79.053638
Physical review. A, Vol. 79, Issue 5 (May 2009) , p. 053638-1-053638-6  

Articles : 32 records found   previous11 - 20nextend  jump to record:
Interested in being notified about new results for this query?
Set up a personal email alert or subscribe to the RSS feed.