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Quantum key distribution (QKD) uniquely allows distribution of cryptographickeys with security verified by quantum mechanical limits. Both protocolexecution and subsequent applications require the assistance of classical datacommunication channels. While using separate fibers is one option, it iseconomically more viable if data and quantum signals are simultaneouslytransmitted through a single fiber. However, noise-photon contamination arisingfrom the intense data signal has severely restricted both the QKD distances andsecure key rates. Here, we exploit a novel temporal-filtering effect fornoise-photon rejection. This allows high-bit-rate QKD over fibers up to 90 kmin length and populated with error-free bidirectional Gb/s data communications.With high-bit rate and range sufficient for important informationinfrastructures, such as smart cities and 10 Gbit Ethernet, QKD is asignificant step closer towards wide-scale deployment in fiber networks.

Coexistence of high-bit-rate quantum key distribution and data on optical fiber