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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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High-speed wavelength-division multiplexing quantum key distribution system.

Ken-ichiro Yoshino1, Mikio Fujiwara, Akihiro Tanaka

  • 1System Platforms Research Laboratories, NEC Corporation, Nakahara-ku, Kawasaki, Japan. yoshino@bp.jp.nec.com

Optics Letters
|August 3, 2012
PubMed
Summary
This summary is machine-generated.

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This study presents a high-speed quantum key distribution system using wavelength-division multiplexing (WDM) and dedicated hardware. The system achieved a secure key rate of 208 kbps over 45 km fiber.

Area of Science:

  • Quantum Information Science
  • Optical Communication Systems

Background:

  • Quantum Key Distribution (QKD) offers secure communication.
  • High-speed and cost-effective QKD systems are needed.

Purpose of the Study:

  • To develop a high-speed QKD system using wavelength-division multiplexing (WDM).
  • To reduce system size, cost, and complexity through shared optical components.

Main Methods:

  • Implemented WDM with two shared interferometers across eight wavelengths.
  • Utilized dedicated hardware engines for real-time key distillation of WDM channels.
  • Demonstrated a three-channel WDM system with hybrid detectors (avalanche photodiodes and superconducting single-photon detectors).

Main Results:

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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  • Achieved 208 kilobits per second secure key rate.
  • Demonstrated 12 hours of continuous key generation.
  • Successfully transmitted over a 45 km field fiber with 14.5 dB loss.

    • Conclusions:

    • The developed WDM QKD system enables high-speed, secure key generation.
    • Shared optical components effectively reduce system complexity and cost.
    • The system's performance is suitable for practical, long-distance quantum communication.