Benjamin Roussel

I am a Research Fellow in Computer Science. I am interested in quantum theory and its intricated relationship with computation as well as communication. More generally, I am interested in quantum physics from the foundations to the intriguing emerging phenomena it leads to, which makes me an undercover physicist.

In the team, I have been interested in how to describe the signal perceived by an accelerated detector in non-stationary situations. The usual notion of particle relates to the ability to make a cut between positive and negative frequencies. Indeed, this introduces an intrinsic conflict in non-stationary cases, similar to the conflict that is present in time-frequency analysis. By using the tools of the former, I developped a new framework based on Wigner distribution to understand the detected signal.

Lately, I was also interested in the physics of the quantum-to-classical transition in complex situations, when the environment is not contains several parts accessing a different information about the system. In this case, the physics of decoherence becomes quite rich and determining the properties of the emerging classical world is an interesting challenge.

My background is mainly theoretical physics. I did my PhD in electron quantum optics at the École Normale Supérieure de Lyon, under the supervision of Pascal Degiovanni. I have developped new ways to describe and understand elementary currents, that carries a few electrons.

If you want to know more about me, you can have have a look at my personal webpage, or contact me via tni.ase@lessuor.nimajneb.