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Related Experiment Video

Updated: Jun 22, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Differential-phase-shift quantum key distribution experiment using fast physical random bit generator with chaotic

Toshimori Honjo1, Atsushi Uchida, Kazuya Amano

  • 1NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi-shi,Kanagawa, 243-0198, Japan. honjo@will.brl.ntt.co.jp

Optics Express
|May 26, 2009
PubMed
Summary

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Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...

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A novel physical random bit generator was integrated into a gigahertz-clocked quantum key distribution system. This advancement enables secure key generation at high speeds, even over long fiber optic distances.

Area of Science:

  • Quantum Information Science
  • Applied Physics
  • Cybersecurity

Background:

  • Quantum Key Distribution (QKD) offers unparalleled security.
  • High-speed random bit generation is crucial for practical QKD systems.
  • Existing methods face limitations in speed and stability.

Purpose of the Study:

  • To integrate a high-speed physical random bit generator into a gigahertz-clocked DPS-QKD system.
  • To evaluate the performance and stability of this integrated system.
  • To demonstrate secure key generation at high rates over fiber transmission.

Main Methods:

  • Utilized a physical random bit generator based on chaotic semiconductor lasers.
  • Applied a 1-Gbps random bit signal for phase modulation in a DPS-QKD system.

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Quasi-light Storage for Optical Data Packets
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Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

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Last Updated: Jun 22, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

  • Conducted experiments involving 25-km fiber transmission.

    • Main Results:

    • Achieved stable system operation for over one hour.
    • Successfully generated sifted keys at a rate of 9.0 kbps.
    • Maintained a quantum bit error rate of 3.2% after transmission.

    Conclusions:

    • Demonstrated the first application of a high-speed physical random bit generator in a gigahertz-clocked QKD system.
    • The system shows promise for practical, high-speed, and secure quantum communication.
    • This integration enhances the feasibility of long-distance quantum key distribution.