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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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500 Mbps high-speed high-sensitivity photon-counting communication demonstration system.

Yue Si, Tiancheng Wen, Jun Huang

|August 13, 2025

Summary

This study introduces a high-speed photon communication system using a 16-pixel superconducting nanowire single-photon detector (SNSPD) array. The system achieves excellent sensitivity and speed, with a bit error rate below 10^-7 at 500 Mbps.

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Area of Science:

Photonics
Optical Communications
Quantum Technologies

Background:

Superconducting nanowire single-photon detectors (SNSPDs) are crucial for sensitive photon detection.
High-speed photon communication systems require efficient signal detection and processing.

Purpose of the Study:

To develop and demonstrate a high-speed, high-sensitivity photon communication system.
To enhance system performance using advanced algorithms for signal correction and synchronization.

Main Methods:

Utilized a 16-pixel SNSPD array for multi-channel detection.
Integrated high-speed optical pulse transmission with array signal reception.
Implemented channel log-likelihood ratio correction and high-speed slot synchronization algorithms.

Main Results:

Achieved a post-decoding bit error rate (BER) better than 10^-7 at 500 Mbps.
Demonstrated high sensitivity with 1.78 photons/bit incident and 0.97 photons/bit detection.
Maintained stable BER performance within a 1.8 dB dynamic range.
Supported 10 G/40 G Ethernet interfaces for high-rate timestamp transmission.

Conclusions:

The demonstrated system offers leading photon sensitivity and high-speed communication capabilities.
The system's advanced performance and reliability are suitable for future photon counting communication systems.
Potential for rapid real-time hardware implementation was indicated by high-speed data transmission rates.