Modified Bose-Einstein condensation in an optical quantum gas

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Open quantum systems can be systematically controlled by making changes to their environment. A prerequisite for a deliberate control of an open quantum system is a sufficient understanding of its underlying physical mechanisms. Here, we investigate the Bose-Einstein condensation of a photonic Bose gas in an environment with controlled dissipation and feedback realized by a potential landscape that effectively acts as a Mach-Zehnder interferometer. Our measurements offer a highly systematic picture of Bose-Einstein condensation under non-equilibrium conditions. We show that the condensation process becomes an interplay between minimizing the energy of the condensate, minimizing the particle losses and maximizing the constructive feedback from the environment.

[1] M. Vretenar et al., arXiv:2105.10708 [cond-mat.quant-gas]
Original languageEnglish
Publication statusPublished - 14 Oct 2021
EventCondensates of light 2022 - Lorentz Center@Oort, Leiden, Netherlands, Leiden, Netherlands
Duration: 4 Apr 20228 Apr 2022,the%20lowest%20energetic%20cavity%20mode.


ConferenceCondensates of light 2022
Internet address


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