Nov. 1, 2009
Prof. Marjatta Lyyra and her collaborators have pioneered novel applications of quantum control in the frequency domain. In this context, effects such as the Autler-Townes splitting and Electromagnetically Induced Transparency provide powerful probes of fundamental molecular properties as well as precision tools for quantum control. These effects are inherently part of high resolution multiple resonance excitation techniques such as the triple resonance technique, co-pioneered at the University of Iowa with the research group of Prof. Stwalley.
Prof. Lyyra’s group has used these techniques to demonstrate molecular angular momentum alignment1 and mapping of the absolute magnitude of the molecular electronic transition dipole moment as a function of internuclear distance, a major step towards getting access to high accuracy molecular oscillator strengths. These experiments involve simply measuring the Autler-Townes split line shape and the coupling laser E field amplitude.
Her group has also demonstrated that the Autler-Townes effect can be used to control quantum state singlet-triplet character,2 i.e. valence electron spin polarization of a pair of rovibronic levels mixed by the spin-orbit interaction.
Her group has recently also developed a new cw quadruple resonance coherent
optical spectroscopic technique, which together with the frequency domain
quantum control scheme holds promise for state selected ultracold molecule
formation in the ground state.
2. In collaboration with Teodora Kirova (PhD thesis) and Prof. Frank Spano.