Abstract　 　 
I will describe the photon statistics of thermal source into some details and discuss their possible application to astronomical observations. Since photons are Bose particles, their fluctuation is not random, but super-Poissonian statistics is expected. In a quantum optics picture, Photon Bunching can be measured by the second-order correlation function using a setup similar to the Hambury-Brown and Twiss experiment in 1950's. Special focus is on application to terahertz interferometry using photon counting detectors. By using the information carried by photon bunches, it will be possible to measure correlation amplitude and their phase, and aperture synthesis images will be obtained by the Photon Counting Terahertz Interferometry (PCTI).

 PhD in Astrophysics from Nagoya University in 1989 Postdoc in Nobeyama Radio Observatory/NAOJ in 1990-1993 Assistant Professor in NRO/NAOJ in 1994-1999 Associate Professor in Advanced Technology Center of NAOJ from 2000 Past works: Nobeyama 45-m telescope and Nobeyama Bolometer Array (NOBA) Rocket-borne observation in submillimeter-wave Infrared Astronomical Satellite 'AKARI' FTS measurement of atmosphere in Atacama ASTE instruments including AzTEC collaboration Development of future instrumentation in THz .