Demonstration of fully-connected quantum communication network exploiting entangled sideband modes
Li Fan, Xiaoli Zhang, Jianbo Li, Jiawei Wang, Shaoping Shi, Long Tian, Yajun Wang, Lirong Chen, Yaohui Zheng · Frontiers of Physics · 2023
Quantum communication network scales point-to-point quantum communication protocols to more than two detached parties, which would permit a wide variety of quantum communication applications. Here, we demonstrate a fully-connected quantum communication network, exploiting three pairs of Einstein—Podolsky—Rosen (EPR) entangled sideband modes, with high degree entanglement of 8.0 dB, 7.6 dB, and 7.2 dB. Each sideband modes from a squeezed field are spatially separated by demultiplexing operation, then recombining into new group according to network requirement. Each group of sideband modes are distributed to one of the parties via a single physical path, making sure each pair of parties build their own private communication links with high channel capacity better than any classical scheme.