The ultimate goal of quantum communication research is to enable widespread connectivity, much like the current internet, with security based on the laws of physics rather than computational complexity. We present a city-wide quantum communication network, with eight users, that forms a fully connected graph/network while requiring only eight wavelength channel pairs, minimal user hardware [i.e., polarization analysis module (PAM)], and no trusted nodes. The network architecture requires only 16 wavelength channels and 2 BS channels to distribute eight entangled states, among the 28 links, between eight users.”]
Source: https://advances.sciencemag.org/content/6/36/eaba0959/tab-pdf