Universität Bonn

Quantum Fluids of Light

24. March 2022

New preprint: Fluctuation-dissipation relation in a photon BEC New preprint: Fluctuation-dissipation relation in a photon BEC

We have observed a fluctuation-dissipation relation in a photon Bose-Einstein condensate coupled to a particle reservoir. Read our preprint on the arXiv!

Fluctuation-dissipation relation in a photon BEC
Fluctuation-dissipation relation in a photon BEC © Julian Schmitt / U Bonn
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We have observed a fluctuation-dissipation relation in a photon Bose-Einstein condensate coupled to a particle reservoir. Read our preprint on the arXiv!

For equilibrium systems, the magnitude of thermal fluctuations is closely linked to the dissipative response to external perturbations. This fluctuation-dissipation relation has been described for material particles in a wide range of fields. Here we experimentally probe the relation between the number fluctuations and the response function for a Bose-Einstein condensate of photons coupled to a dye reservoir, demonstrating the fluctuation-dissipation relation for a quantum gas of light. The observed agreement of the scale factor with the environment temperature directly confirms the thermal nature of the optical condensate.

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