Long-distance teleportation of atomic qubit via optical interferometry

Details Long-distance teleportation of atomic qubit via optical interferometry Long-distance teleportation of atomic qubit via optical interferometry

2006-09-27

arxiv.org/abs/quant-ph/0609214v1

Physics

Quantum Physics

Scientific paper

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.

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