We prepare a maximally entangled state of two ions and couple both ions tothe mode of an optical cavity. The phase of the entangled state determines thecollective interaction of the ions with the cavity mode, that is, whether theemission of a single photon into the cavity is suppressed or enhanced. Byadjusting this phase, we tune the ion--cavity system from sub- tosuperradiance. We then encode a single qubit in the two-ion superradiant stateand show that this encoding enhances the transfer of quantum information onto aphoton.
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