[14p-B406-1~18] 3.10 Optical quantum physics and technologies

▲ [14p-B406-15] Multi-dimensional spatial entanglement for secure communications using the conventional optical fiber network

〇Adam Valles¹, Isaac Nape², Jun Liu³, Qianke Wang³, Jian Wang³, Andrew Forbes², Takashige Omatsu^1,4 (1.MCRC Chiba Univ., 2.Wits Univ., 3.Huazhong Univ., 4.Chiba Univ.)

Keywords:Quantum communications, Hybrid entanglement

The future of secure quantum communications requires the distribution of entangled states over long distances. Because of the imminent appearance of quantum computers, being able to easily decipher our current encryption protocols, it is necessary to consider the advantages that quantum entangled states can offer improving our current secure communication networks. Here we transport multi-dimensional entangled states down conventional single-mode fiber (SMF). We achieve this by entangling the spin-orbit degrees of freedom of a bi-photon pair, passing the polarisation (spin) photon down the SMF while accessing multi-dimensional orbital angular momentum (orbital) subspaces with the other.