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Chemical Physics Letters

Quantum control of spin–orbit coupling by dynamic Stark-shifts induced by laser fields

Jesús González‐Vázquez, Ignacio R. Solá, Jesús Santamarı́a, Vladimir S. Malinovsky

Published Oct 2, 2006• 41 citations
Publisher
DOI
10.1016/j.cplett.2006.09.085

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A method to optically control a dark transition, for instance, the coupling between different spin states, is proposed. The control is achieved by manipulating the direction, amplitude, and duration of dynamic Stark shifts. Laser-driven spin switches can be prepared by conveniently generalizing different optical techniques, such as $\ensuremath{\pi}$-pulse schemes and adiabatic passage schemes. The efficiency and robustness of the schemes is analyzed for both two-level and multilevel systems, implying quantum state selective wave packet transfer between states of different multiplicity.
We investigated the electromagnetically induced transparency in spin-orbit-coupled finite-temperature cold quantum gases. We showed that spin-orbit coupling can induce an additional frequency shift in the absorption line, which can be observed nondestructively from the electromagnetically induced transparency spectroscopy. As an alternative method this shift can be used to detect and measure the spin-orbit coupling strength. The spin-orbit coupling can also be used as a switch to control laser light propagation in this medium.
This paper presents a theoretical study of the light-induced shift of the coherent population trapping resonance. An analytical model is proposed that describes the interaction of two radiation components with an atomic system using a ΛΛΛ scheme and takes into account an additional level of excited state. Both weak and strong coupling regimes with off-resonant transitions are considered. It is shown that, in addition to the conventional dynamic Stark shift, an extra shift arises due to the distortion of the resonance line shape when bichromatic laser radiation interacts with off-resonant atomic transitions. An analytical expression for this additional shift is derived in the weak-coupling limit, and its significant impact on the resonance shape and sensitivity to the intensities of the laser field components is demonstrated. It is found that under strong coupling conditions, the additional shift can deviate substantially from a linear dependence on light intensity, suggesting new opportunities for controlling light shifts in precision atomic devices such as quantum frequency standards.