Classical Communication Cost of Quantum Teleportation

Quantum teleportation schemes in which operations are performed before establishing the quantum channel are not constrained by resource limits set in H.K.Lo [8] and Bennett et al. [4]. We compare the standard teleportation protocol to the one proposed by Kak on the basis of the classical communication cost. Due to its unique architecture we study the problems in implementing Kak teleportation protocol. Introduction Quantum state teleportation and dense coding are the elementary components of quantum information science. Both use entanglement as a resource in achieving information processing capabilities far superior to classical communication and computing. In dense coding, the classical communication capacity of the quantum channel is doubled as one qubit is used to transmit two classical bits. H.K.Lo [8] and Bennett et al. [4] discuss the optimal resource limit in teleportation and both conclude that teleportation of a quantum state needs at least 2 classical bits and 1 shared EPR resource. Teleportation protocols recently proposed by Kak [7] teleport achieve similar results with lesser classical communication cost. ∗ E-mail address : [email protected]