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Using an aluminum gallium arsenide microring resonator, we demonstrate abright quantum optical microcomb with $>300$ nm bandwidth and more than 20 setsof time-energy entangled modes, enabling spectral demultiplexing with simple,off-the-shelf commercial telecom components. We report high-rate continuousentanglement distribution for two sets of entangled-photon pair frequency modesexhibiting up to $20$ GHz/mW$^2$ pair generation rate. As an illustrativeexample of entanglement distribution, we perform a continuous-wave time-binquantum key distribution protocol with 8 kbps raw key rates while maintainingless than 10$\%$ error rate and sufficient two-photon visibility to ensuresecurity of the channel. When the $>$20 frequency modes are multiplexed, weestimate $>$100 kbps entanglement-based key rates or the creation of amulti-user quantum communications network. The entire system requires less than110 $\mu$W of on-chip optical power, demonstrating an efficient source ofentangled frequency modes for quantum communications. As a proof of principle,a quantum key is distributed across 12 km of deployed fiber on the UCSB campusand used to transmit a 21 kB image with $<9\%$ error.

Continuous Entanglement Distribution from an AlGaAs-on-Insulator Microcomb for Quantum Communications