  Silicon-Germanium (SiGe) is a material that possesses a multitude of
applications ranging from transistors to eletro-optical modulators and quantum
dots. The diverse properties of SiGe also make it attractive to implementations
involving superconducting quantum computing. Here we demonstrate the
fabrication of transmon quantum bits on SiGe layers and investigate the
microwave loss properties of SiGe at cryogenic temperatures and single photon
microwave powers. We find relaxation times of up to 100 $\mu$s, corresponding
to a quality factor Q above 4 M for large pad transmons. The high Q values
obtained indicate that the SiGe/Si heterostructure is compatible with state of
the art performance of superconducting quantum circuits.
