Datasets & code

Compressibility and the equation of state of an optical quantum gas in a box

We have studied light confined to a two-dimensional cavity with a box potential. We have measured both spatial and momentum spectra, and using a tilted box we have measured the compressibility of the photon gas and determined its equation of state in a regime around the phase transition to quantum degeneracy. The results show the formation of a highly compressible Bose-Einstein condensate. The dataset contains spatial and momentum distributions, the extracted compressibility and the measured equation of state presented in the corresponding manuscript.

Related paper: Compressibility and the Equation of State of an Optical Quantum Gas in a Box

Cite as: Busley Erik, Espert Miranda Leon, Redmann Andreas, Kurtscheid Christian, Karkihalli Umesh Kirankumar, Vewinger Frank, Weitz Martin, & Schmitt Julian. (2022). Compressibility and the equation of state of an optical quantum gas in a box (Version v1) [Data set]. Zenodo. https://doi.org/10.5281/zenodo.5775757

Transit effects for non-linear index measurement in hot atomic vapors

This code aims at giving the tools for both measurement and numerical estimation of non-linear index of refractions in hot alkali vapors.
It aims at providing an easily reusable codebase in modern languages (Python) while benefiting from the performance of a compiled language (Julia).

Related paper: Transit effects for non-linear index measurement in hot atomic vapors

Cite as: Tangui Aladjidi, Murad Abuzarli, Guillaume Brochier, Tom Bienaimé, Thomas Picot, Alberto Bramati, Quentin Glorieux. (2022). Transit effects for non-linear index measurement in hot atomic vapors [Code]. GitHub. https://github.com/Quantum-Optics-LKB/Transit.

Observation of a non-Hermitian phase transition in an optical quantum gas

We have experimentally investigated the second-order coherence of a photon Bose-Einstein condensate. Our data demonstrate a non-Hermitian phase transition of a photon Bose-Einstein condensate to a new dissipative phase, characterized by a biexponential decay of the condensate’s second-order coherence. The dataset contains measured spectra, second-order correlations and the extracted phase diagram as presented in the corresponding paper.

Related paper: Observation of a Non-Hermitian Phase Transition in an Optical Quantum Gas

Cite as: Fahri Emre Öztürk, Tim Lappe, Göran Hellmann, Julian Schmitt, Jan Klaers, Frank Vewinger, Johann Kroha, & Martin Weitz. (2020). Observation of a non-Hermitian phase transition in an optical quantum gas [Data set]. Zenodo. https://doi.org/10.5281/zenodo.4522437

Thermally Condensing Photons into a Coherently Split State of Light

The datasets in this repository contain

Using a microstructuring technique, we have created double-well potentials for photons in an optical microcavity.  We coherently populate the spatially split state with photons by thermalizing the photons into a low-energy ground state by repeated absorption-emission interaction with a fluorescent dye within the double-dimple optical cavity. The dataset contains spectra, spatial images of the potentials as well as interference data, as presented in the corresponding manuscript.

Related paper: Thermally Condensing Photons into a Coherently Split State of Light

Cited as: Christian Kurtscheid, David Dung, Erik Busley, Frank Vewinger, Achim Rosch, & Martin Weitz. (2019). Thermally Condensing Photons into a Coherently Split State of Light. https://doi.org/10.5281/zenodo.3497303