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

Area of Science:

• Quantum optics and photonics
• Semiconductor device physics
• Quantum information science

Background:

• High-speed single-photon detectors are essential for advancing quantum key distribution (QKD).
• Existing InGaAs/InP single-photon avalanche diodes (SPADs) require further integration for practical, high-frequency applications.
• Gigahertz clock rates are critical for enabling secure, high-throughput QKD systems.

Purpose of the Study:

• To develop a compact, stable, and user-friendly single-photon detector system for high-speed QKD.
• To integrate control and optimization functions for InGaAs/InP SPADs.
• To demonstrate the system's performance and long-term stability at GHz gate rates.

Main Methods:

• Development of an integrated InGaAs/InP single-photon detector system.
• Characterization of key detector parameters, including efficiency and dark counts.
• Testing of system stability over extended continuous operation (75 hours) at a 1.25 GHz gate rate.

Main Results:

• Successful development of a novel, integrated InGaAs/InP single-photon detector system.
• Demonstration of stable operation at a 1.25 GHz gate rate.
• Characterization confirming the system's suitability for high-speed QKD.

Conclusions:

• The developed detector system significantly enhances the potential for high-speed QKD.
• This work represents a crucial step towards practical and widespread adoption of high-speed QKD.
• The integrated and user-friendly design facilitates broader application in quantum communication security.