  We propose a route to detect Majorana bound states (MBSs) by coupling a
topological superconductor to quantum dots (QDs) in a $pnp$ junction. Here, two
MBSs are coherently coupled to electrons on two QDs, which recombine with holes
to photons. We focus on the spectroscopy of cross-correlated shot noise and the
polarization of the emitted photons. Our detection scheme allows us to probe
the necessary condition for the emergence of MBSs, specifically, the existence
of nonlocal triplet superconducting correlations and also the fundamental
property that two MBSs comprise a single complex fermion. We compare our
results to the ones obtained from nontopological quasi-MBSs (qMBSs) and
establish a correspondence between the number of peaks in the cross-correlation
with the number of MBSs in the system. Here, we can identify a tunneling regime
that facilitates differentiation between topological MBSs and trivial qMBSs.
Additionally, we test the robustness of the detection scheme by the addition of
uncorrelated quasiparticles.
