dr Artur Barasiński, Palacky University

Role of multipartite entanglement in quantum teleportation

Quantum teleportation is considered as one of the major protocols in quantum information science. By exploiting the physical resource of entanglement, quantum teleportation has played a prominent role in the development of quantum information theory and represents a fundamental ingredient to the progress of many quantum technologies. Although quantum teleportation is a typically bipar- tite process, it can be extended to multipartite quantum protocols. An important example of such extension is known as the controlled quantum teleportation which forms a backbone of quantum teleportation network, a prelude for a genuine quantum Internet. It is commonly believed that con- trolled teleportation (and quantum teleportation network) is a clear manifestation of multipartite entanglement and both protocols involve pre-sharing a genuine multipartite entangled resource. In my presentation, I will discuss the role of multipartite entanglement in controlled quantum telepor- tation. In particular, I shall present a counterintuitive result of successful controlled teleportation performed without multipartite entanglement what disproves the current misconception.