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Quantum key distribution (QKD) relies on quantum communication to allow distant parties to share a secure cryptographic key. Widespread adoption of QKD in current telecommunication networks will require the development of simple, low-cost, and stable systems. However, current QKD implementations usually include additional hardware that perform auxiliary tasks such as temporal synchronization and polarization basis tracking. Here we present a polarizationbased QKD system operating at 1550 nmdoi:10.1364/optica.381013 fatcat:v7xzamlmavej5exhxf5kzimt3q