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A scalable full QKD system using WDM and a key distillation HW engine was developed. The three-channel multiplexed system achieved the world summit level key generation rate of higher than 200 kbps with 14.5-dB transmission loss.
In July 2009, the national standard tool for measuring length in Japan changed from an iodine-stabilized helium-neon (He-Ne) laser to a femtosecond optical frequency comb (FOFC). Owing to the outstanding frequency stability of the FOFC, in the near-future General Conference of Weights and Measures (Conférence générale des poids et measures: CGPM), the FOFC is expected as a new standard tool for...
A novel interferometric technique using a femtosecond optical frequency comb (FOFC) is developed to observe the average temperature change over 3 m. The present technique is expected to be useful for environmental condition measurement.
Recent progress in quantum key distribution (QKD), regarding high-speed and long-distance experiments and field trials are briefly reviewed. We also introduce our research on the randomness of quantum key. We have confirmed a quantum key, as a crypto key, assures the required randomness with some dynamic compensation.
A novel modulation scheme for making a high-speed Quantum-key-distribution (QKD) with decoy-state is proposed and confirmed. Using the proposed scheme, photon number is optimised, and high-speed QKD with decoy-state for a metro-area network has successfully established.
Recent progress in quantum key distribution (QKD) network technologies including an optically switched multi-user QKD network and activities for QKD performance improvements are presented.
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