Determination of Low Loss in Isotopically Pure Single Crystal ${}^{28}$Si at Low Temperatures and Single Microwave Photon Energy

Nikita Kostylev, Maxim Goryachev, Andrey D. Bulanov +2

The low dielectric losses of an isotropically pure single crystal ${}^{28}$Si sample were determined at a temperature of 20 mK and at powers equivalent to that of a single photon. Wh…