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Field test of quantum key distribution in the Tokyo QKD Network

M. Sasaki, M. Fujiwara, H. Ishizuka, W. Klaus, K. Wakui, M. Takeoka, A. Tanaka, K. Yoshino, Y. Nambu, S. Takahashi, A. Tajima, A. Tomita, T. Domeki, T. Hasegawa, Y. Sakai, H. Kobayashi, T. Asai, K. Shimizu, T. Tokura, T. Tsurumaru, M. Matsui, T. Honjo, K. Tamaki, H. Takesue, Y. Tokura, J. F. Dynes, A. R. Dixon, A. W. Sharpe, Z. L. Yuan, A. J. Shields, S. Uchikoga, M. Legre, S. Robyr, P. Trinkler, L. Monat, J. -B. Page, G. Ribordy, A. Poppe, A. Allacher, O. Maurhart, T. Langer, M. Peev, A. Zeilinger

TL;DR

Two GHz-clocked QKD links enable the world-first secure TV conferencing over a distance of 45km to be demonstrated and detection of an eavesdropper, rerouting into a secure path, and key relay via trusted nodes are demonstrated in this network.

Abstract

A novel secure communication network with quantum key distribution in a metropolitan area is reported. Different QKD schemes are integrated to demonstrate secure TV conferencing over a distance of 45km, stable long-term operation, and application to secure mobile phones.

Field test of quantum key distribution in the Tokyo QKD Network

TL;DR

Two GHz-clocked QKD links enable the world-first secure TV conferencing over a distance of 45km to be demonstrated and detection of an eavesdropper, rerouting into a secure path, and key relay via trusted nodes are demonstrated in this network.

Abstract

A novel secure communication network with quantum key distribution in a metropolitan area is reported. Different QKD schemes are integrated to demonstrate secure TV conferencing over a distance of 45km, stable long-term operation, and application to secure mobile phones.

Paper Structure

This paper contains 11 sections, 20 figures.

Table of Contents

  1. Introduction
  2. Outline of the Tokyo QKD Network
  3. QKD systems used in the Tokyo QKD Network
  4. NEC-NICT system
  5. TREL system
  6. NTT-NICT system
  7. Mitsubishi system
  8. IDQ system
  9. All-Vienna system
  10. Demonstration of secure network operation
  11. Conclusions and Future Outlook

Figures (20)

  • Figure 1: (a) Physical link configuration of the Tokyo QKD Network. It is a mesh-type network consisting of four access points, Koganei, Otemachi, Hakusan, and Hongo. In total, six kinds of QKD systems are installed in these access points. Some QKD links are connected in a loopback configuration with parallel fibers. (b) Logical link configuration with 6 nodes. Link distances range from 1 km to 90 km .
  • Figure 2: Three-layer architecture of the Tokyo QKD Network. It consists of the quantum, the key management, and the communication layer.
  • Figure 3: Wiring diagram of the Tokyo QKD Network.
  • Figure 4: Block diagram of NEC's QKD system. Sync.: Synchronization, Cont.: Controller, Rnd.: Random Number, Dist.: Distillation, IA: Intel Architecture.
  • Figure 5: Photon transmission schematics of the NEC-NICT system. AMZI: Asymmetrical MachZehnder Interferometer, PLC: Planar Lightwave Circuit, DML: Directly Modulated Laser, IM/PM: Intensity Modulation/Phase Modulation, CLK: Clock, RNG: Random Number Generator, MZM: Mach-Zehnder Modulator, IM: Intensity Modulation, PM: Phase Modulation, ATT: Attenuator, NBF: Narrow Bandpass Filter, PLL: Phase Locked Loop, SSPD: Superconducting Single Photon Detector.
  • ...and 15 more figures