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frequency standards. NICT is gearing up to develop unique technologies in these areas to support future development of ICT. In this special issue, the current status of research and development for each technical challenge is described, where the main focus is placed on those undertaken in NICT.Masahiro TAKEOKA, Ph.DDirector, Quantum ICT Advanced Development Center, Advanced ICT Reseach InstituteQuantum optics, Quantum information theoryKouichi SEMBA, Dr. Eng.Executive Researcher, Frontier Research Laboratory, Advanced ICT Research InstituteSuperconducting quantum electronicsMasahide SASAKI, Ph.DDistinguished Researcher, Advanced ICT Research InstituteQuantum communication, Quantum cryptographyFiF3　Toward widespread acceptance of QICT across society Fusion of quantum and modern ICTs＋Modern security technology・Secure storage by secret sharing・Secure computation・Signature, authenticationPhysical layer cryptography, physical random number generation, OTP encryption..＝Ultralong-term secure data center NWCentury-longsecurity assurance of genome data, state secrets, and others＋Toward novel security technologiesFree-space optical communication technology・Satellite optical communication technologyDrones and other unmanned airborne vehicles＝Secure drone communicationSatellite quantum communicationQuantum node technology・Quantum light source, detector・Quantum metrology・Quantum interface(Superconductor quantum circuit)Tokyo QKD networkCoherent optical communicationSilicon photonicsFrequency standard technology, etc.Portable optical frequency standardNext generation QKDSecure mobile communicationnetworkQuantum sensing＋Optical space communication testbedQuantum Key Distribution (QKD)Realization of unconditional securityRelated technologies⇒Applying the technology to free-spacecommunication by reasonably limiting wiretapping capabilityQuantum cryptography⇒Invincible against any computer⇒Detects all eavesdropping attacks92 Quantum Info-Communication Technology -Overview-