  The problem of long-distance teleportation of single-atom qubits via a common
photonic channel is examined within the framework of a Mach-Zender optical
interferometer. As expected, when a coherent state is used as input, a
high-finesse optical cavity is required to overcome sensitivity to spontaneous
emission. However, we find that a number-squeezed light field in a twin-Fock
state can in principle create useful entanglement without cavity-enhancement.
Both approaches require single photon counting detectors, and best results are
obtained by combining cavity-feedback with twin-fock inputs. Such an approach
may allow a fidelity of $.99$ using a two-photon input and currently available
mirror and detector technology. In addition, the present approach can be
conveniently extended to generate multi-site entanglement and entanglement
swapping, both of which are necessities in quantum networks.
