Time-Bin BB84 QKD System Using Indium Phosphide and Silicon Nitride Photonic Integrated Circuits

Alexander Grebenchukov; Chigo Okonkwo; Denis Fatkhiev; Gleb Nazarikov; Idelfonso Tafur Monroy; Jo\~ao dos Reis Fraz\~ao

arxiv: 2606.21308 · v1 · pith:3OCSFO5Ynew · submitted 2026-06-19 · 🪐 quant-ph

Time-Bin BB84 QKD System Using Indium Phosphide and Silicon Nitride Photonic Integrated Circuits

Denis Fatkhiev , Alexander Grebenchukov , Jo\~ao dos Reis Fraz\~ao , Gleb Nazarikov , Chigo Okonkwo , Idelfonso Tafur Monroy This is my paper

classification 🪐 quant-ph

keywords systembb84photonictime-binattacksbelowcircuitscoherent

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We demonstrate a dual-chip InP-SiN photonic QKD system with on-chip pulse generation and reconfigurable decoding, implementing time-bin BB84 with finite-key security against coherent attacks. The system sustains a QBER below 4% and delivers secret keys at kbps rates over 150-250 km of fiber.

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Time-Bin BB84 QKD System Using Indium Phosphide and Silicon Nitride Photonic Integrated Circuits

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