Figure 5
From: Tunable electromagnetic environment for superconducting quantum bits
Effective qubit temperature vs. resistor temperature.
Effective temperature of the qubit as a function of the temperature of the resistor, which may be manipulated using SIN tunnel junction thermometry. The results are shown for bare left-cavity frequencies of 
(solid line) and 
(dashed line) resulting in zero-temperature relaxation rates of 9.59 × 109 s−1 and 1.01 × 105 s−1, respectively. The frequency 
is selected to yield the maximum decay rate for the qubit–like eigenstate. In calculating the total excitation and de-excitation rates, we include an intrinsic qubit relaxation rate of 
and excitation rate of 
, to give an intrinsic qubit temperature of Ti = 120 mK. The parameters are otherwise identical to those used in Fig. 3.
