Towards a low-cost secure quantum Internet

I will address our efforts towards the construction of a low-cost secure quantum Internet with untrusted relays. I will primarily talk our experiments on silicon photonic chip-based quantum key distribution (QKD), including high-speed measurement-device-independent QKD [arXiv: 1911.00690 (2019)] and continuous-variable QKD [Nat. Photon. 13, 839 (2019)]. If time permits, I will also briefly discuss our experiments on blind quantum computing [PRL, 123, 100503 (2019] and all-photonic quantum repeaters [Nat. Photon. 13, 644 (2019)]. Further details can be found in our review paper for RMP [Xu et al., arXiv:1903.09051 (2019)].