当研究室でのインターンシップを終えたJean-Samuelさんから、レポートが届きました。3月から8月までの約5ヶ月間、お疲れ様でした！
We have received a report from Jean-Samuel who has completed his internship in our lab. Thank you very much for your hard work over the five months from March to August!

In the Ohmori group I have been working on building a rearrangement setup to create defect-free array of atoms. In fact, when we load atoms on optical tweezers, we have a 50-60% probability of effectively keeping only one atom inside the tweezer, otherwise we get an empty trap.

Rearrangement therefore aims to move the atoms from one tweezer to another in order to completely fill an area of the array of traps. It is a work that has already been done, for example by Sylvain during his PhD thesis, by moving atoms one by one[1]. This method was used to rearrange a target array of 324 atoms[2]. The aim of my internship was to perform the array rearrangement by moving several atoms at the same time, in order to reach a target array of 1000 atoms with a higher success rate and in a shorter time.

I worked with a pair of acousto-optic deflectors (AODs) and a computer with an Nvidia GPU and an arbitrary waveform generator (AWG) card. I developed an HTTP server and a complete package to interact with the GPU and the AWG card to generate the waveforms needed to drive the AODs in a very short time; and an algorithm to compute the movements to be performed in less than 1 millisecond.

During this 5-month internship, I had the time to finish to write all the necessary code and teach other lab members how to use it. I had the very good opportunity to present my promising results at the ICOLS conference. Unfortunately, my internship was too short for being able to see the project through to completion. I hope that the current researchers will be able to finish it. I would like to thank the laboratory for the excellent welcome. I have had a wonderful experience in Japan. I really enjoyed being able to work on my own project, with autonomy and help when needed, with all the tools I needed to take it forward.

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[1] Daniel Barredo et al., An atom-by-atom assembler of defect-free arbitrary two-dimensional atomic arrays. Science 354,1021-1023(2016).

[2] Kai-Niklas Schymik et al., In situ equalization of single-atom loading in large-scale optical tweezer arrays. Phys. Rev. A 106, 022611.