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We discuss a scheme for a full superdense coding of entangled photon statesemploying only linear-optics elements. By using the mixed basis consisting offour states that are unambiguously distinguishable by a standard and polarizingbeam splitters we can deterministically transfer four messages by manipulatingjust one of the two entangled photons. The sender achieves the determinism ofthe transfer either by giving up the control over 50% of sent messages(although known to her) or by discarding 33% of incoming photons.

Entanglement and Superdense Coding with Linear Optics