High Resolution Spectroscopy and Signatures of the Zeno Effect in an Optical Lattice
March 29th, 2019 MANEL BOSCH Laboratoire Kastler-Brossel, Paris

Alkaline-earth-like atoms such as ytterbium feature an optical clock transition (free of spontaneous emission) which makes them attractive for metrological purposes (e.g. as frequency standards) but also for protocols in the field of quantum computing and quantum simulation. For this, understanding the properties of the states involved in such a transition is essential.

In our group, we load degenerate bosonic gases in optical lattices. In the first part of my talk I will report on experiments performed in the deep insulating regime. This situation allows us to freeze the external dynamics of the atoms and exploit the coherent nature of the clock transition in order to probe their internal properties. In particular, we have performed spectroscopy to measure the elastic and inelastic scattering parameters of both clock states.

From these measurements, we remarked a large inelastic two-body loss rate for atoms in the excited state. These losses lead to dissipation and are detrimental for the preparation of equilibrium states, preventing for instance the possibility of observing strongly correlated phases. Therefore, schemes to reduce these losses are desirable. In the second part of my talk, I will present a first set of experiments in which a Zeno suppression of these losses appears when performing adiabatic passages on the clock transition. This inhibition can be understood from the non-hermitian nature of the hamiltonian responsible for the coupling and the interaction, which provides a subspace where transitions to the lossy states are strongly reduced.

Seminar, March 29, 2019, 15:00. ICFO’s Seminar Room

Hosted by Prof. Leticia Tarruell