Entangled state quantum key distribution and teleportation

Chithrabhanu Perumangatt, Abdul Rahim Aadhi, GANGIREDDY SALLA +4 more

Hubel, Fedrizzi, Poppe +2 more

Andreas Poppe

Entanglement is a necessary prerequisite for unconditionally secure quantum key distribution (QKD). The generation and distribution of polarization entangled photon pairs will be discussed as the basis for QKD, teleportation and quantum repeaters. (1 page)

Xiaoxuan Li

Quantum teleportation and quantum key distribution (QKD) both play a key role in the application of quantum information processing. They have been widely realized in experiments in the past decades. We construct a multipartite QKD protocol using teleportation by a Greenberger-Horne-Zeilinger entangled state. The latter is a frequently studied family entangled states in theory and experiments. Our protocol shows the security because the loss of any particles does not lead to the loss of information the sender wants to send to the receiver. Further, the classical messages cost in the protocol occur only among some particles. We also apply the unextendible product operator basis (UPOB) by performing them on high dimensional states, which are then teleported to the receiver. We stress that UPOBs are related to quantum nonlocality, which is associated with the local indistinguishability of orthogonal states. Hence our paper may contribute to the novel understanding of quantum nonlocality, as well as related quantum-information tasks such as state and operation discrimination.

Paul R. Tapster

P. Chithrabhanu, Abdul Rahim Aadhi, Salla Gangi Reddy +3 more

We describe a novel multi-particle, multi-degree entangled system in which one particle is entangled to other particles in different degrees of freedom. It allows efficient teleportation of a higher dimensional quantum state. We give a new protocol for quantum key distribution using this state and describe possible experimental realizations of the proposed QKD as well as the teleportation protocols.