Distribution of Telecom Time-Bin Entangled Photons Through a 7.7 Km Antiresonant Hollow-Core Fiber

State of the art classical and quantum communication rely on standard opticalfibers with solid cores to transmit light over long distances. However, recentadvances have led to the emergence of antiresonant hollow-core optical fibers(AR-HCFs), which due to the novel fiber geometry, show remarkable opticalguiding properties, which are not as limited by the material properties assolid-core fibers. In this paper, we explore the transmission of entangledphotons through a novel 7.7 km AR-HCF in a laboratory environment at 1550 nm,presenting the first successful demonstration of entanglement distribution viaa long AR-HCF. In addition to showing these novel fibers are compatible withlong distance quantum communication, we highlight the low latency and lowchromatic dispersion intrinsic to AR-HCF, which can increase the secure keyrate in time-bin based quantum key distribution protocols.