Shortwave DPS-QKD Employing a SiN Micro-Ring Resonator as Compact Quantum State Analyser

We show simplified DPS-QKD using a SiN micro-ring resonator operated at 852 nm. A rawkey rate of up to 25.3 kb/s is reached at a QBER suitable for secure-key extraction. Short-reach QKD operation is maintained for zero-touch link layouts with C-band telecom fiber.