Quantum teleportation of composite systems via mixed entangled states
Somshubhro Bandyopadhyay, Barry Cyril Sanders · Physical Review A · 2006
We analyze quantum teleportation for composite systems, specifically for concatenated teleporation (decomposing a large composite state into smaller states of dimension commensurate with the channel) and partial teleportation (teleporting one component of a larger quantum state). We obtain an exact expression for teleportation fidelity that depends solely on the dimension and singlet fraction for the entanglement channel and entanglement (measures by $I$ concurrence) for the state; in fact quantum teleportation for composite systems provides an operational interpretation for $I$ concurrence. In addition we obtain tight bounds on teleportation fidelity and prove that the average fidelity approaches the lower bound of teleportation fidelity in the high-dimension limit.