Victor Gondret
Post-Doctoral researcher in Quantum Physics
I am a post-doctoral researcher working in experimental quantum physics. I did my PhD work on a metastable helium Bose-Einstein condensate machine, in the Quantum Atom Optics team within the Laboratoire Charles Fabry, Institut d’Optique, Université Paris-Saclay. My work lies in the field of so-called analog gravity, which aims to study the dynamics of collective excitations—quasiparticles—on top of a strong background. By engineering the shape of this background, one can explore phenomena that are analogous to black holes or cosmological inflation, for example. An emphasis of this field is the study of the nonclassical behavior of these phenomena, such as the observation of squeezing and entanglement, which was the main goal of my PhD work.
During my PhD, I introduced a novel entanglement criterion which applies to two-mode Gaussian states that relates the measurement of many-body correlation functions to the amount of quantum entanglement. I also experimentally investigated the growth dynamics of parametrically excited quasiparticles. These quasiparticles are created in pairs, with their generation seeded by vacuum fluctuations, resulting in an entangled two-mode state, that we recently observed and reported on.
I now join the Amazing Quantum team led by Carla Hermann, in the University of Chile, in quantum optics. The aim of this project is to study the quantumness properties of intense quantum state of light.
news
| Aug 2025 |
New preprint on ArXivWe have just released a new preprint on ArXiv which reports on the measurement of the growth dynamics of quasiparticles in an elongated Bose-Einstein condensate . We compare our result to Bogoliubov description and observe an excellent agreement  . The growth rate we extract from the data does not exhibit a strong reduction which confirms the smallness of interaction between quasiparticles in elongated Bose gas  . See this post for spicy details!
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| Jul 2025 |
Accepted in Phys. Rev. Lett.!Our theoretical work which introduce an entanglement criterion for two-mode Gaussian states was just accepted by Physical Review Letter. What a great news! 
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| Jul 2025 |
ArXiv release of our observation of entanglement in a cold atom analog of preheating!We have released a new observation on arXiv . In it, we excite parametrically collective excitations  in a Bose-Einstein condensate, which mimics parametric amplification of particle in preheating, the stage after cosmic inflation  . This is done by changing periodically the effective 1D coupling constant of the elongated cloud, which parametrically produce pairwise opposite momentum quasiparticles  . As the initial temperature of the gas is very low, the exponential growth of the excitation number is largely triggered by vacuum fluctuations, resulting in an entangled state, which we observe  . Have a look at it!
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