  A magnetic impurity on a superconductor induces Yu-Shiba-Rusinov (YSR) bound
states, detected by tunneling spectroscopy as long-lived quasiparticle
excitations inside the superconducting gap. Coupled YSR states constitute basic
elements to engineer artificial superconducting states, but their
substrate-mediated interactions are generally weak. In this paper, we report
that intramolecular (Hund's like) exchange interactions produce coupled YSR
states across a molecular platform. We measured YSR spectra along a magnetic
iron-porphyrin on Pb(111) and found evidences of two orbital interaction
channels, which invert their particle-hole asymmetry across the molecule.
Numerical calculations show that the identical YSR asymmetry pattern of the two
channels is caused by two spin-hosting orbitals with opposite potential
scattering and coupled strongly. Both channels can be similarly excited by
tunneling electrons into each orbital, depicting a new scenario for entangled
superconducting bound states using molecular platforms.
