Sekido, M.M.SekidoTakefuji, K.K.TakefujiUjihara, H.H.UjiharaHachisu, H.H.HachisuNemitz, N.N.NemitzPizzocaro, M.M.PizzocaroClivati, C.C.ClivatiCalonico, D.D.CalonicoIdo, T.T.IdoTsutsumi, M.M.TsutsumiKawai, E.E.KawaiNamba, K.K.NambaOkamoto, Y.Y.OkamotoTakahashi, R.R.TakahashiKomuro, J.J.KomuroIchikawa, R.R.IchikawaIshijima, H.H.IshijimaBregolin, F.F.BregolinLevi, F.F.LeviCantoni, E.E.CantoniCerretto, G.G.CerrettoPERINI, FEDERICOFEDERICOPERINIMACCAFERRI, GIUSEPPEGIUSEPPEMACCAFERRINEGUSINI, MONIAMONIANEGUSINIRICCI, ROBERTOROBERTORICCIMura, AlbertoAlbertoMura2020-12-162020-12-162019978-84-416-5634-5http://hdl.handle.net/20.500.12386/28888NICT has developed a broadband VLBI (very-long-baseline interferometry) system for intercontinental frequency transfer. After domestic tests in Japan, a 2.4 m diameter VLBI station was exported and installed at Medicina astronomy observatory of INAF in Italy in 2018. We have started VLBI experiments for optical clock comparison on an Italy-Japan intercontinental baseline. Reference signals generated by an ytterbium (Yb) optical lattice clock at INRiM in Torino and by a strontium (Sr) lattice clock at NICT headquarters in Koganei are compared by a series of links, which include a coherent optical fiber link between INRiM and Medicina and intercontinental VLBI observation between Medicina and Koganei. A series of VLBI experiments was performed from Oct. 2018 to Feb. 2019. Yb and Sr lattice clocks were repeatedly operated throughout the same period for frequency comparison.ELETTRONICOenConference paperhttps://www.sea-astronomia.es/24th-meeting-european-vlbi-group-geodesy-and-astrometry-evga2019evga.conf...52SFIS/01 - FISICA SPERIMENTALEERC sectors::Physical Sciences and Engineering::PE2 Fundamental constituents of matter: particle, nuclear, plasma, atomic, molecular, gas, and optical plasma::PE2_17 Metrology and measurement