  Recent experiments have demonstrated strong coupling between living bacteria
and light. Here we propose a scheme capable of revealing non-classical features
of the bacteria (quantum discord of light-bacteria correlations) without exact
modelling of the organisms and their interactions with external world. The
scheme puts the bacteria in a role of mediators of quantum entanglement between
otherwise non-interacting probing light modes. We then propose a plausible
model of this experiment, using recently achieved parameters, demonstrating the
feasibility of the scheme. Within this model we find that the steady state
entanglement between the probes, which does not depend on the initial
conditions, is accompanied by entanglement between the probes and bacteria, and
provides independent evidence of the strong coupling between them.
