Perfect teleportation, quantum-state sharing, and superdense coding through a genuinely entangled five-qubit state

We investigate the usefulness of a recently introduced five-qubit state by Brown et al. [ I. D. K. Brown, S. Stepney, A. Sudbery and S. L. Braunstein J. Phys. A 38 1119 (2005)] for quantum teleportation, quantum-state sharing, and superdense coding. It is shown that this state can be utilized for perfect teleportation of arbitrary single and two-qubit systems. We devise various schemes for quantum-state sharing of an arbitrary single- and two-particle state via cooperative teleportation. We later show that this state can be used for superdense coding as well. It is found that five classical bits can be sent by sending only three quantum bits.