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Polarization-independent wavelength path switching is demonstrated with one-chip silicon photonic circuit including 64 thermo-optical switch elements within 12mm × 3mm. Owing to uniformity, any path can be constructed by simply turning on one switch element.
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 45km, stable long-term operation, and application to secure mobile phones.
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.
InAlAs-APDs were developed and characterized its detection performances for single photon counting. We succeed to improve the signal-to-noise ratio not only by the crystal quality but also by the multiplication layer design.
To investigate the after pulse process and the device design for after pulse reduction, we fabricated an InAlAs-APD with two-step mesa structure. We report the after pulse probability for the InAlAs multiplication layer for the first time.
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.
Spontaneous emission phenomena are investigated for 2D photonic-crystal slab with quantum dots. The emission-decay time is found to be increased ~15-fold, due to the inhibition of in-plane spontaneous emission and suppression of nonradiative channels.
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