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20Frontier researchAdvanced ICT Research InstituteThe Advanced ICT Research Institute is engaged in research and development toward innovative information and communications technology (ICT) for future society, that cannot be achieved by improving existing technologies. To achieve this, we are exploring to create new concepts, new technologies, and new materials that can produce funda-mental technologies for ICT in the future. Specific technologies targeted for R&D include high-functionality ICT device technology explore the epoch-making fundamental technology as the core of various ICT devices by developing and creating high-functional elements and groundbreaking fabrication technologies with extreme precision, quantum ICT technologies to create reliable and robust communication technologies based on the ultimate scientific principle of quantum mechanics, ultra-high-frequency terahertz (THz) technologies toward pioneer ultra-high-speed wireless com-munications and sensing technologies that surpass existing technologies, and fundamental Bio-ICT technologies to produce new ICT paradigm by investigating and applying the superior functions and eicient mechanisms of living things. And besides, to promote the social adoption of the results produced by these basic and fundamental research projects, we have established three technology development centers in the institute: Quantum ICT Advanced Develop-ment Center, Green ICT Device Advanced Development Center, and DUV ICT Device Advanced Development Center, focusing our research and development eorts on near-future implementation of our research establishments from a needs-oriented point of view.The following introduces major research results to date.High-functionality ICT device tech-nologyIn our research on small, ultra-fast optical modulators for practical use, we succeeded in filling a silicon slot waveguide with an organic electro-optic (EO) polymer with no voids with the aim of achieving 400-Gbps-plus optical interconnects. We also verified the optical-propagation properties of this waveguide thereby obtaining technology that can achieve hybrid optical modulators based on an organic-EO-polymer/Si-slot waveguide. Furthermore, in ever-expanding interdisciplinary research toward THz-class ultra-high-frequency applications, we suc-ceeded in fabricating an organic-EO-poly-mer ridge waveguide clad in THz low-ab-sorption material and verified high-efficiency THz-wave generation by a novel waveguide structure the first of its kind in the world (Fig.1).Next, in our R&D efforts aimed at broad-ening the application field of superconduct-ing single photon detectors (SSPDs), we demonstrated high-speed response seven times that of our conventional SSPDs in a new device structure called the supercon-ducting nanowire avalanche photodetector (SNAP). We fabricated a multi-pixel (32×32) SSPD prototype and developed cryogenic signal processing using a single-flux-quan-tum (SFQ) circuit operating with a time ac-curacy below 10 ps for a high-speed SSPD system. In the development of feromagnetic Josephson junctions for application to su-perconducting qubits, we succeeded in ob-serving the π state for the first time in the world in a magnetic Josephson junction made of a nitride superconductor (Fig.2), which is an important fundamental tech-nology for realizing superconducting qubits with superior coherence.Fig.1 : Fabrication of a THz-wave generator by an EO polymer transfer process• Development of technology for transferring organic EO polymer to dif-cult-to-bond materials• World’s rst THz-wave high-efciency generator from a ridge waveguideResearch and Development