Demonstration of fully-connected quantum communication network exploiting entangled sideband modes

Abstract

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.

Graphical abstract

Keywords

quantum network / quantum communication / entangled sideband modes / quantum dense coding

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Acknowledgements

We acknowledge the financial support from the National Natural Science Foundation of China (NSFC) (Grant Nos. 62225504, 62027821, 62035015, U22A6003, and 12174234), the National Key R&D Program of China (Grant No. 2020YFC2200402), and the Program for Sanjin Scholar of Shanxi Province.

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