  We theoretically study how a scattered electron can entangle molecular spin
qubits (MSQs). This requires solving the inelastic transport of a single
electron through a scattering region described by a tight-binding interacting
Hamiltonian. We accomplish this using a Green's function solution. We can model
realistic physical implementations of MSQs by parameterizing the tight-binding
Hamiltonian with first-principles descriptions of magnetic anisotropy and
exchange interactions. We find that for two-MSQ systems with inversion
symmetry, the spin degree of freedom of the scattered electron offers
probabilistic control of the degree of entanglement between the MSQs.
