Ultralong temporal coherence in optically trapped exciton-polariton condensates

We investigate an optically trapped exciton-polariton condensate and observe temporal coherence beyond 1 ns in duration. Due to the reduction of the spatial overlap with the thermal reservoir of excitons, the coherence time of the trapped condensate is more than an order of magnitude longer than that of an untrapped condensate. This ultralong coherence enables high-precision spectroscopy of the trapped condensate, and we observe periodic beats of the field correlation function due to a fine energy splitting of two polarization modes of the condensate. Our results are important for realizing polariton simulators with spinor condensates in lattice potentials.

Automated summary

Researchers observed temporal coherence beyond 1 ns in an optically trapped exciton-polariton condensate, with coherence time more than an order of magnitude longer than an untrapped condensate. This ultralong coherence allows for high-precision spectroscopy of the trapped condensate, where periodic beats of the field correlation function were observed due to fine energy splitting of two polarization modes of the condensate, emphasizing the importance for polariton simulators with spinor condensates in lattice potentials.