2 00 5 Faithful and deterministic teleportation of an arbitrary N - qubit state using and identifying only Bell states

First, I show explicitly a scheme to faithfully and deterministically teleport an arbitrary 2-qubit state from Alice to Bob. In this scheme two same Bell states are sufficient for use. Bob can recover the 2-qubit state by performing at most 4 single-qubit unitary operations conditioned on Alice’s 4-bit classical public message corresponding to her two Bell-state measurement outcomes. Then I generalize the 2-qubit teleportation scheme to an aribitrary N(N ≥ 3)-qubit state teleportation case by using N same Bell states. In the generalized scheme, Alice only needs to identify N Bell states after quantum swapping and then publish her measurement outcomes (2N -bit classical message). Conditioned on Alice’s 2N -bit classical message, Bob only needs to perform at most 2N single-qubit unitary operations to fully recover the arbitrary state. By comparing with the newest relevant work [Phys. Rev. A71, 032303(2005)], the advantages of the present schemes are revealed, respectively.