Quantum teleportation in artificial photosystems: possibilities and limitations

The possibility of performing quantum teleportation (QT) in a molecular system consisting of an unknown radical spin and a singlet-coupled acceptor-donor pair is studied. The recombination of radical-acceptor pair to its ground state is spin-selective. Here we show that in the presence of exchange interaction between the acceptor and donor, the spin-selective recombination acts as the Bell state measurement. The spin-recombination and the exchange interaction derive the initial quantum state to one of the four Bell states; as a result the spin state of the radical is teleported to the donor spin.