A generalization of quantum teleportation and splitting of entanglement via local cloning

Abstract

In the original one-to-one teleportation protocol of Bennett et al. [1], an observer Alice transmits the information of a d-level system to another observer Bob with perfectˇdelity, by using a maximally entangled state. We introduce a generalization called the many-to-many teleportation, where the information is sent from N observers to M receivers situated at different locations. One of the most interesting applications of quantum cloning is the symmetric broadcasting of entanglement proposed by Buzek et al. [2]. We propose the splitting of entanglement based on local optimal universal asymmetric cloning machine, and then, by applying the PeresÄHorodecki criterion, we analyze the inseparability of theˇnal states.