  We propose a protocol to perform long-range distribution of near-maximally
entangled multiphoton states, allowing versatile applications such as quantum
key distribution (QKD) and quantum metrology which can provide alternatives to
state-of-the-art protocols. Our scheme uses resources available within the
current integrated quantum photonic technology: squeezed vacuum states and
photon-number-resolving detectors. The distributed entanglement can be
certified by Bell tests which have the potential to be loophole free, and may
be directly used in well established QKD protocols. Generally, this provides
measurement-device-independent (MDI) levels of security, which may be upgraded
to fully device-independent (DI) security if the Bell test is loophole-free. In
both cases, the protocol is robust to extremely high transmission losses,
matching the optimal $O(\sqrt{\eta})$ scaling of key rate with channel
transmittance.
