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

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

Published on: September 5, 2019

Long-distance entanglement-based quantum key distribution over optical fiber.

T Honjo¹, S W Nam, H Takesue

¹NTT Basic Research Laboratories, NTT Corporation, Atsugi-shi 243-0198, Japan. honjo@will.brl.ntt.co.jp

|July 8, 2009

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This study demonstrates the first entanglement-based quantum key distribution (QKD) over 100 km of optical fiber. The experiment successfully generated a secure key, advancing secure communication technologies.

Area of Science:

Quantum Information Science
Quantum Communication
Optoelectronics

Background:

Quantum key distribution (QKD) offers enhanced security over classical cryptography.
Entanglement-based QKD leverages quantum entanglement for secure key generation.
Extending QKD distances is crucial for practical, widespread adoption.

Purpose of the Study:

To demonstrate the first entanglement-based quantum key distribution (QKD) experiment over a 100-km optical fiber.
To evaluate the feasibility and performance of entanglement-based QKD at extended distances.
To showcase the integration of advanced quantum technologies for secure communication.

Main Methods:

Utilized superconducting single photon detectors (NbN nanowires) for high-speed detection in the 1.5-μm telecom band.

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Last Updated: Jun 21, 2026

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

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

Published on: September 5, 2019

Quasi-light Storage for Optical Data Packets

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

Employed an efficient entangled photon pair source featuring a fiber-coupled periodically poled lithium niobate waveguide and ultra-low loss filters.

Integrated planar lightwave circuit Mach-Zehnder interferometers (MZIs) for ultra-stable operation.

Main Results:

Successfully performed an entanglement-based QKD experiment over a 100-km optical fiber.
Generated a 16 kbit sifted key during an approximately 8-hour experiment.
Achieved a quantum bit error rate (QBER) of 6.9% at a rate of 0.59 bits per second.
Distilled a 3.9 kbit secure key from the generated sifted key.

Conclusions:

Entanglement-based QKD is feasible over 100-km optical fiber links.
The developed system components (detectors, sources, MZIs) enable high-performance QKD at telecom wavelengths.
This work represents a significant step towards long-distance, secure quantum communication networks.