Fig. 1

Experimental setup revealing quantum features of photosynthetic organisms. We consider a driven single-sided multimode Fabry–Perot cavity embedding green sulphur bacteria. Here, R1 is the reflectivity of the input mirror, while the end mirror is perfectly reflecting with R2 ≈ 1. A few cavity modes individually interact with the bacteria, but not with each other. Both the bacteria and cavity modes are open systems. In particular, the interaction between the bacteria and their environment results in the energy decay rate 2γn. The mth cavity field mode experiences energy dissipation at a rate 2km