Fig. 2: DQD characterization with the tunable resonator.
From: Strong hole-photon coupling in planar Ge for probing charge degree and strongly correlated states
A region of the DQD charge stability diagram as a function of the applied plunger gate voltages VpR and VpL, recorded by dc-transport (a) and by measuring the phase (b) of the feedline transmission S21, arg(S21), at fd = fr = 5.01 GHz. The resonator detects inter-dot and reservoir-dot transitions when their tunneling rates are close to fr67. Yellow (orange) dashed box in b: the phase signal increases (decreases) near the inter-dot region with respect to the background, if the resonator is dispersively shifted to lower (higher) frequency. Notably, because the resonator gate lever arm is larger for the right QD, the resonator is more sensitive to its QD-reservoir transitions with respect to those of the left QD. c, Inter-dot transition probed with fr = 5.01 GHz ~ 2tc/h. d A line-cut taken along the red dashed line in c. The black dashed curve shows the fit to a master equation (see Methods).
