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Related Experiment Video

Updated: Jun 13, 2026

Quasi-light Storage for Optical Data Packets

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

Quantum key distribution based on phase encoding in long-distance communication fiber.

Shi-Hai Sun¹, Hai-Qiang Ma, Jia-Jia Han

¹Department of Physics, National University of Defense Technology, Changsha 410073, China.

|April 23, 2010

Summary

A new quantum key distribution system using phase encoding is stable and effective over 100 km of fiber. This robust system automatically corrects for disturbances, achieving low error rates for secure communication.

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Last Updated: Jun 13, 2026

Quasi-light Storage for Optical Data Packets

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Area of Science:

Quantum Information Science
Optical Communication Systems
Cryptography

Background:

Quantum Key Distribution (QKD) offers enhanced security over classical cryptography.
Implementing QKD over long distances in real-world fiber networks presents significant challenges, including signal degradation and environmental noise.

Purpose of the Study:

To demonstrate a robust two-way quantum key distribution (QKD) system.
To evaluate the system's performance over commercial communication fiber at distances of 50 km and 100 km.
To assess the system's stability and error rates under practical conditions.

Main Methods:

Development of a two-way QKD system utilizing phase encoding.
Testing the system over 50 km and 100 km of standard commercial optical fiber.
Implementation of automatic compensation mechanisms for birefringence effects.
Utilizing a train of pulses without requiring storage fiber for the 100 km test.

Main Results:

Successful demonstration of a stable QKD system over 50 km and 100 km fiber links.
The system exhibited automatic compensation for birefringence, maintaining stability for over 23 hours.
Achieved a low quantum bit error rate (QBER) and high visibility, indicating high-quality key generation.
Eliminated the need for storage fiber in the 100 km experimental setup.

Conclusions:

The demonstrated phase-encoded, two-way QKD system is robust and practical for deployment in existing fiber networks.
The system's ability to compensate for birefringence and maintain stability over extended periods is crucial for real-world applications.
The results highlight the potential for secure long-distance quantum communication using commercially available fiber infrastructure.