  We theoretically model the electronic dynamics of a coupled quantum dot pair
in a static electric field. We then investigate the possibility of
polarization-entangled photon emission from the radiative cascade of the
molecular biexciton state. Through numerical simulations, we analyze the
dependence of entanglement fidelity on temperature and electric field, as well
as tunnel coupling. We establish a regime of direct-indirect exciton detunings
for which coupled quantum dots are superior to single dots for entangled photon
generation, yielding near-unit fidelity over a larger range of exchange
splittings.
