Fully integrated InGaAs/InP single-photon detector module with gigahertz sine wave gating

TL;DR

This paper presents a compact, stable, and fully integrated InGaAs/InP single-photon detector module operating at 1.25 GHz, significantly advancing high-speed quantum key distribution technology.

Contribution

First integration of a stable, user-friendly InGaAs/InP single-photon detector system at gigahertz rates with performance optimization functions.

Findings

Achieved continuous operation for 75 hours demonstrating stability.

Characterized key detector parameters at 1.25 GHz.

Enhanced potential for practical high-speed QKD applications.

Abstract

InGaAs/InP single-photon avalanche diodes (SPADs) working in the regime of GHz clock rates are crucial components for the high-speed quantum key distribution (QKD). We have developed for the first time a compact, stable and user-friendly tabletop InGaAs/InP single-photon detector system operating at a 1.25 GHz gate rate that fully integrates functions for controlling and optimizing SPAD performance. We characterize the key parameters of the detector system and test the long-term stability of the system for continuous operation of 75 hours. The detector system can substantially enhance QKD performance and our present work paves the way for practical high-speed QKD applications.