Jitter suppression scheme for detection pulses in high-speed sinusoidal gated single-photon detectors

• Proposed a retiming scheme using coincidence signals synchronized with sinusoidal gating to suppress detection signal jitter in high-speed SPDs. • Identified key contributors to rising-edge jitter: optical pulse width, avalanche generation, signal extraction, and pulse discrimination. • Achieved significant reduction in after-pulse probability from 10.7% to 0.72% in a 1.25 GHz InGaAs/InP SPD. • Method is simple to implement and avoids direct interference with detector operation, enhancing QKD system performance.