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We explore possibilities of entangling two distant material qubits with thehelp of an optical radiation field in the regime of strong quantumelectrodynamical coupling with almost resonant interaction. For this purposethe optimum generalized field measurements are determined which are capable ofpreparing a two-qubit Bell state by postselection with minimum error. It isdemonstrated that in the strong-coupling regime some of the recently foundlimitations of the non-resonant weak-coupling regime can be circumventedsuccessfully due to characteristic quantum electrodynamical quantuminterference effects. In particular, in the absence of photon loss it ispossible to postselect two-qubit Bell states with fidelities close to unity bya proper choice of the relevant interaction time. Even in the presence ofphoton loss this strong-coupling regime offers interesting perspectives forcreating spatially well-separated Bell pairs with high fidelities, high successprobabilities, and high repetition rates which are relevant for futurerealizations of quantum repeaters.

Photon-assisted entanglement creation by minimum-error generalized quantum measurements in the strong coupling regime