Fig. 4

Sample details. False-colored optical micrographs. a Relevant part of the sample (dashed region) false colored as follows: SQUID array (coupling) resonator in orange with corresponding drive and probe port in yellow, transmon in green, one end of the \(50\ \Omega\) (read-out) resonator in gray, GaAs in black and grounded Al in white. The position of the TQD (see Fig. 1c) is outlined with a red rectangle. The microwave lines that route probe and drive tones to the sample are shown. The frequencies \({\nu }_{i}\) are labeled as in Fig. 1a. b Magnified optical image of the transmon region in a. The positions of transmon SQUID and flux line with current \(I\) are marked. c Optical micrograph of the \(50\ \Omega\) resonator and its microwave read-out line. The location of the region shown in a is outlined with a black rectangle