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Journals and Conferences
A practical quantum cryptosystem prototype has been developed for metro area applications. It is of the size of a desktop and incorporates a temperature-independent optical interferometer, a highly… (More)
Secure networks composed of optical networks and quantum key distribution (QKD) are considered in this paper. A network layer structure is defined to focus on issues important with respect to the QKD… (More)
We demonstrate 112Gb/s transmission using PM-QPSK format and FPGA-based real-time digital signal processing. By employing framed processing architecture for polarization demultiplexing and carrier… (More)
We evaluate the use of edge-illuminated holographic Bragg filters formed in phenanthrenequinone-doped poly(methyl methacrylate) for optical-code-division multiple-access (OCDMA) coding and decoding… (More)
We investigated the characteristics of shared keys obtained through quantum key distribution (QKD) from the viewpoint of application in cipher communication. We demonstrated that the shared keys at… (More)
A high-speed QKD system, which has an automatic modulation-phase-alignment mechanism for compensating for GVD, was developed. Using this system, we confirmed high-speed and stable quantum key… (More)
Frame synchronization and supervisory control scheme were proposed for use in QKD, which all were based on QBER monitoring. Using these techniques proposed here, two weeks of continuous quantum key… (More)
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… (More)
This paper considers a PMD compensation method using FDE and analytically shows that MMSE based SIMO and MIMO FDE weights in the PMD channel are identical because of the unitarity of the Jones matrix.
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.