Kalle-Antti Suominen

ADIABATIC PASSAGE BY LIGHT-INDUCED POTENTIALS IN MOLECULES

We present the APLIP process (Adiabatic Passage by Light Induced Potentials) for the adiabatic transfer of a wave packet from one molecular potential to the displaced ground vibrational state of another. The process uses an intermediate state, which is only slightly populated, and a counterintuitive sequence of light pulses to couple the three molecular states. APLIP shares many features with STIRAP (stimulated Raman adiabatic passage), such as high efficiency and insensitivity to pulse parameters. However, in APLIP there is no two-photon resonance, and the main mechanism for the transport of the wave packet is a light-induced potential. The APLIP process appears to violate the Franck-Condon principle, because of the displacement of the wave packet, but does in fact take place on timescales which are at least a little longer than a vibrational timescale

Quantum Approach to Informatics

Preface. 1. Introduction. 2. Quantum Theory. 3. Quantum Communication and Information. 4. Quantum Computing. 5. Physical Realization of Quantum Information Processing. References. Index.

Vortex nucleation in Bose-Einstein condensates in time-dependent traps

Vortex nucleation in a Bose-Einstein condensate subject to a stirring potential is studied numerically using the zero-temperature, two-dimensional Gross-Pitaevskii equation. In the case of a rotating, slightly anisotropic harmonic potential, the numerical results reproduce experimental findings, thereby showing that finite temperatures are not necessary for vortex excitation below the quadrupole frequency. In the case of a condensate subject to stirring by a narrow rotating potential, the process of vortex excitation is described by a classical model that treats the multitude of vortices created by the stirrer as a continuously distributed vorticity at the center of the cloud, but retains a potential flow pattern at large distances from the center.

Creation of a monopole in a spinor condensate.

We propose a method to create a monopole structure in a multicomponent condensate by applying the basic methods used to create vortices and solitons experimentally in single-component condensates. We also show that by using a two-component structure for a monopole, we can avoid many problems related to the previously suggested three-component monopole. We discuss the observation and dynamics of such a monopole structure, and note that the dynamics of the two-component monopole differs from the dynamics of the three-component monopole.

NONLINEAR LEVEL-CROSSING MODELS

We examine the effect of nonlinearity at a level crossing on the probability for nonadiabatic transitions

TIME-DEPENDENT CONTROL OF ULTRACOLD ATOMS IN MAGNETIC TRAPS

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Tailoring of vibrational state populations with light-induced potentials in molecules

. By using the Dykhne-Davis-Pechukas formula, we derive simple analytic estimates for

Raman photoassociation of Bose-Fermi mixtures and the subsequent prospects for atom-molecule Cooper pairing

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Shortcut to a Fermi-degenerate gas of molecules via cooperative association.

for two types of nonlinear crossings. In the first type, the nonlinearity in the detuning appears as a {it perturbative} correction to the dominant linear time dependence. Then appreciable deviations from the Landau-Zener probability

Weisskopf-Wigner decay of excited oscillator states.

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