Experimental search for EDM in diamagnetic atom $^{129}$Xe using active nuclear spin maser

A permanent electric dipole moment (EDM) which directly means $T$-violation attracts much attention, because an unknown \textit{CP}-violating phase which is necessary to understand the present matter-dominated Universe is expected to be probed by EDM. The present study aims at measuring the EDM in the diamagnetic atom $^{129}$Xe to a size of 10$^{-28}$ $e$cm, stepping into a domain below the present upper limit by one order of magnitude. In the present experiment, we employ an active nuclear spin maser which has characteristics of the optical detection of the spin precession and the artificial production of the feedback field to sustain the spin precession over a long measurement duration. For the magnetometry in the measurement, a comagnetometer using $^{3}$He is incorporated to the spin maser system. In this presentation, the current status of our experiment will be given.