Search results for "Quantum physic"

High resolution study of the six lowest doubly excited vibrational states of PH2D

2005

Abstract The five lowest doubly excited deformational vibrational bands ν 4  +  ν 6 , 2 ν 6 , ν 3  +  ν 4 , ν 3  +  ν 6 , and 2 ν 3 of PH 2 D have been recorded for the first time using a Bruker 120 HR interferometer with a resolution 0.0033 cm −1 and analysed. Some transitions belonging to a very weak band 2 ν 4 have been also assigned. From the fit 24 and 86, respectively, diagonal and resonance interaction parameters were obtained which reproduce 1089 upper energy levels obtained from more than 4600 assigned transitions with the rms deviation of 0.00059 cm −1 .

The U(p+1) Formalism Applied to The Vibrational Hamiltonians of Nonlinear AB2 Molecules

2000

Study of High Resolution Spectra of the PH2D Molecule in the Regions of the Deformational Vibrational Bands 2v4, v4+v6, 2v6, v3+v4, v3+v6 and 2v3

2005

Study of Resonance Interactions and Splittings in the PH3 Molecule : v1, v3, v2+v4 and 2v4 Bands

2002

Symmetrized Local States and Effective Dipole Moment within a Rovibrational Cartesian Picture.

1997

Symmetry-adapted tensorial formalism to model rovibrational and rovibronic spectra of molecules pertaining to various point groups

2004

International audience; We present a short review on the tensorial formalism developed by the Dijon group to solve molecular spectroscopy problems. This approach, originally devoted to the rovibrational spectroscopy of highly symmetrical species (spherical tops) has been recently extended in several directions: quasi-spherical tops, some symmetric and asymmetric tops, and rovibronic spectroscopy of spherical tops in a degenerate electronic state. Despite its apparent complexity (heavy notations, quite complex mathematical tools), these group theoretical tensorial methods have a great advantage of flexibility: a systematic expansion of effective terms for any rovib- rational/rovibronic probl…

Implementation of single-qubit quantum gates by adiabatic passage and static laser phases

2006

International audience; We propose and analyse experimentally feasible implementations of single-qubit quantum gates based on stimulated Raman adiabatic passage (STIRAP) between magnetic sublevels in atoms coupled by elliptically polarized pulsed laser fields, in part based on a proposal by Kis and Renzoni [Z. Kis, F. Renzoni, Phys. Rev. A 65 (2002) 032318]. These techniques require only the control of the relative phase of the driving fields but do not involve any dynamical or geometric phases, which makes it independent of the other interaction details: detuning, pulse shapes, pulse areas and pulse durations. The suggested techniques are immune to spontaneous emission since the qubit mani…

Ultrafast stimulated Raman parallel adiabatic passage by shaped pulses

2009

We present a general and versatile technique of population transfer based on {\it parallel adiabatic passage} by femtosecond shaped pulses. Their amplitude and phase are specifically designed to optimize the adiabatic passage corresponding to parallel eigenvalues at all times. We show that this technique allows the robust adiabatic population transfer in a Raman system with the total pulse area as low as 3 $\pi$, corresponding to a fluence of one order of magnitude below the conventional stimulated Raman adiabatic passage process. This process of short duration, typically pico- and subpicosecond, is easily implementable with the modern pulse shaper technology and opens the possibility of ul…

On the Study of the Very High Excited Vibrational Levels of the Pyramidal Molecules

2006

Algebraic Approach to Vibrational Spectra of Stibine Molecule

2002

International audience