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Sympathetic laser cooling of the pair 88Sr+/9Be+ in an ion trap : towards quantum logic spectroscopy

M2 Internship / PhD

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Person in charge of the internship : A. DOUILLET ; J.-P. LIKFORMAN
Tel : 0157276217 / 0157277051
e-mail : douillet@spectro.jussieu.fr / jean-pierre.likforman@univ-paris-diderot.fr

Possibility to go on with a PhD ? YES
Envisaged fellowship : An application to a funding agency will be necessary for a PhD grant.

Laser cooled trapped ions are among the few physical systems in which quantum control has reached levels such that quantum information algorithms can be implemented (e.g. 2012 Nobel Prize for Physics awarded to David Wineland and Serge Haroche).

Quantum logic operations have also recently been used to develop a completely new spectroscopic technique (the quantum logic spectroscopy) that allow for unprecedented precision in optical clocks and, more generally, to address atomic or molecular transitions in species that cannot be directly laser-cooled. This technique is based on the so-called « sympathetic cooling » in which two species of ions are trapped in the same device and one of them is laser-cooled while the other is probed.

This technique will be implemented in an experiment at LMPQ (QITe group) in the framework of a collaboration with LKB-jussieu (Trapped Ions group) with the pair of ions 88Sr+ (cooler) 9Be+ (spectroscopy ion). The project motivation is to study the behaviour of sympathetic cooling in a peculiar regime in which the mass ratio between co-trapped ions is quite high. This is the regime in which several future experiments (e.g. GBAR CERN collaboration devoted to understand the antimatter behaviour with respect to gravity) will be performed.

During the proposed internship we will study the first experimental step consisting in the sympathetic cooling of 9Be+ by a large number of 88Sr+ ions in the so-called Doppler regime (Coulomb crystal).

Successful internship candidate should like atomic and molecular physics and have some background in optics. She / He will participate to the setup and operation of the optical bench dedicated to this experiment, with particular emphasis on the new UV laser setup addressing 9Be+ ions.