The Experts below are selected from a list of 270 Experts worldwide ranked by ideXlab platform
Michael F. Reid - One of the best experts on this subject based on the ideXlab platform.
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Effective Two-Photon Transition operators: perturbative calculations and connectivity of diagrams
Journal of Alloys and Compounds, 2002Co-Authors: Chang-kui Duan, Michael F. ReidAbstract:Perturbation theory expansions appropriate to Two-Photon processes between energy levels of rare earth ions are examined. The construction of effective Two-Photon Transition operators that contain only connected diagrams is shown to be possible, but more complicated than previously thought.
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Additional operators for crystal field and Transition intensity models
Journal of Alloys and Compounds, 1993Co-Authors: Michael F. ReidAbstract:Abstract Several extensions have been proposed to the simple one-electron, single-ligand, spin-independent models commonly used in the calculation of crystal field splitting and one- and Two-Photon Transition intensities in the f N configurations of rare earth ions. These extensions are discussed, with particular emphasis on restrictions imposed by selection rules.
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Recent extensions to crystal-field and Transition-intensity models
Journal of Alloys and Compounds, 1992Co-Authors: Michael F. ReidAbstract:Recent extensions to the one-electron model of crystal-field interactions and the second-order theory of Transition intensities are discussed. These include the development of correlation crystal field models and the inclusion of correlation and spin-dependent effects in calculations of both one-photon and Two-Photon Transition intensities.
Philippe Grangier - One of the best experts on this subject based on the ideXlab platform.
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operation of a quantum phase gate using neutral atoms in microscopic dipole traps
Physical Review A, 2002Co-Authors: Igor Protsenko, Nicolas Schlosser, Georges Reymond, Philippe GrangierAbstract:In this paper we propose and analyze various operating regimes of a quantum phase gate built on two atoms trapped in two independent dipole traps. The gate operates when the atoms are excited using a Two-Photon Transition from the hyperfine manifold of ground states up to Rydberg states with strong dipole-dipole interaction. Experimental requirements are discussed to reach a fast (microsecond) gate operation.
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Operation of quantum phase gate using neutral atoms in microscopic dipole trap
Physical Review A, 2002Co-Authors: Igor E. Protsenko, Nicolas Schlosser, Georges Reymond, Philippe GrangierAbstract:In this paper we propose and analyze various operating regimes of a quantum phase gate built on two atoms trapped in two independent dipole traps. The gate operates when the atoms are excited using a Two-Photon Transition from the hyperfine manifold of ground states up to Rydberg states with strong dipole-dipole interaction. Experimental requirements are discussed to reach a fast (microsecond) gate operation.
Laurent Hilico - One of the best experts on this subject based on the ideXlab platform.
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Vibrational spectroscopy of H2+: hyperfine structure of Two-Photon Transitions
Physical Review A, 2008Co-Authors: Jean-philippe Karr, Franck Bielsa, Albane Douillet, Jofre Pedregosa Gutierrez, Vladimir Korobov, Laurent HilicoAbstract:We present the computation of Two-Photon Transition spectra between ro-vibrational states of the H2+ molecular ion, including the effects of hyperfine structure and excitation polarization. The reduced Two-Photon matrix elements are obtained by means of a variational method. We discuss the implications of our results for high-resolution spectroscopy of H2+.
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Vibrational spectroscopy of H2+: hyperfine structure of Two-Photon Transitions
Physical Review A, 2008Co-Authors: Jean-philippe Karr, Franck Bielsa, Albane Douillet, Jofre Pedregosa Gutierrez, Vladimir I. Korobov, Laurent HilicoAbstract:We present the computation of Two-Photon Transition spectra between rovibrational states of the $\text{H}_{2}{}^{+}$ molecular ion, including the effects of hyperfine structure and excitation polarization. The reduced Two-Photon matrix elements are obtained by means of a variational method. We discuss the implications of our results for high-resolution spectroscopy of $\text{H}_{2}{}^{+}$.
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Energy levels and Two-Photon Transition probabilities in the HD+ ion
Journal of Physics B, 2005Co-Authors: Jean-philippe Karr, Senem Kilic, Laurent HilicoAbstract:We present a fully exact non-relativistic calculation of the energies and wavefunctions of the J=1 states of the HD+ molecular ion. The energies are obtained with a very high accuracy of 10-14 au, representing for most levels, an improvement by several orders of magnitude over previous calculations. We compute the static polarisabilities of the J=0 states, which are in agreement with the literature, with an improved accuracy, as well as the Two-Photon Transition probabilities and light shifts between J=0 states. Finally, we extend our study to Transitions between higherJ states, using an approximate expression of the Transition probability, and discuss the feasibility of a Two-Photon spectroscopy experiment in HD+.
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polarizabilities light shifts and two photon Transition probabilities between j 0 states of the h2 and d2 molecular ions
Journal of Physics B, 2001Co-Authors: Laurent Hilico, N Billy, Benoit Gremaud, Dominique DelandeAbstract:We present the computation of the Two-Photon Transition matrix element between vibrational states of H2+ or D2+ of 1Se symmetry (i.e. two J = 0 vibrational levels of the 1sσg electronic ground state). The method uses very accurate fully non-adiabatic wavefunctions of the non-relativistic problem. It is first applied to the calculation of the static polarizabilities; our results for the ground state are in excellent agreement with the literature, with an improved accuracy. The method is applied to the evaluation of the Two-Photon Transition probabilities and light shifts. We also discuss the feasibility of a Two-Photon spectroscopy experiment in H2+.
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Polarisabilities, Light Shifts and Two-Photon Transition Probabilities between J=0 states of the H2+ and D2+ Molecular Ions.
Journal of Physics B, 2001Co-Authors: Laurent Hilico, N Billy, Benoit Gremaud, Dominique DelandeAbstract:We present the computation of the Two-Photon Transition matrix element between vibrational states of H2+ or D2+ of the 1Se symmetry (i.e. two J=0 vibrational levels of the 1ssg electronic ground state). The method uses very accurate fully non adiabatic wave functions of the non-relativistic problem. It is first applied to the calculation of the static polarisabilities; our results for the ground state are in excellent agreement with the litterature, with an improved accuracy. The method is applied to the evaluation of the Two-Photon Transition probabilities and light shifts. We also discuss the feasibility of a Two-Photon spectroscopy experiment in H2+.
Kaige Wang - One of the best experts on this subject based on the ideXlab platform.
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Quantum-nondemolition measurement by a Two-Photon Transition in the presence of the Stark shift: errata
Journal of the Optical Society of America B, 1998Co-Authors: Guojan Yang, Kaige WangAbstract:We evaluate the effectiveness of a quantum-nondemolition measurement scheme in an effective two-level atomic configuration in the presence of the Stark shift. We compare the prediction of this model with that of its full cascade three-level counterpart and analyze the relationship between the quantum-nondemolition gain and the dynamic instability of the system.
Antonio Quattropani - One of the best experts on this subject based on the ideXlab platform.
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Excitonic effects on the Two-Photon Transition rate in quantum wells
Superlattices and Microstructures, 1991Co-Authors: Alfredo Pasquarello, Antonio QuattropaniAbstract:Abstract We calculate Two-Photon Transition rates of exciton states in GaAs quantum wells for varying well widths. The excitons states are described in the effective-mass approximation and are obtained variationally assuming wavefunctions which are separable in the r -coordinates. The Two-Photon Transition rate is calculated taking explicity into account the sum over all the intermediate states, using a variational procedure. We calculate Transition rates of excitons of s -symmetry as well as of p -symmetry which are allowed for polarization of the radiation beam along the growth axis and in the layer planes respectively. From our calculations we find that Transitions to s-type excitons have significant rates and we expect them to give rise to well-distinguishable peaks in the absorption spectrum. On the other hand, p -type excitons have small rates and their effect in the absorption spectrum is limited to a small feature at the onset of absorption. These results are in agreement with experiment.
