Identifying Sources of Entanglement Loss in Photodriven Molecular Electron Spin Teleportation.

We report on an electron donor-electron acceptor-stable radical (D-A-R • ) molecule in which an electron spin state first prepared on R • is followed by photogeneration of an entangled singlet 1 [D •+ -A •- ] spin pair to produce D •+ -A •- -R • . Since the A •- and R • spins within D •+ -A •- -R • are uncorrelated, spin teleportation from R • to D •+ occurs with a maximal 25% efficiency only for the singlet pair 1 (A •- -R • ) by spin-allowed electron transfer from A •- to R • . However, since 1 [D •+ -A •- ] is sufficiently long-lived, coherent spin mixing involving the unreactive 3 (A •- -R • ) population affects entanglement and teleportation within D •+ -A •- -R • . Pulse electron paramagnetic resonance experiments show a direct correlation between electron spin flip-flops and entanglement loss, providing information for designing molecular materials to serve as nanoscale quantum device interconnects.