Figure 3
From: Light-matter decoupling and A2 term detection in superconducting circuits
(a) Equivalent circuit of a suspended transmon capacitively coupled to an open transmission line, via a spatial-dependent capacitance Cc(z). (b) Relative value of the spontaneous emission rate as a function of the normalized coupling capacitance, c = Cc/CJ, for a model with (solid) and without (dashed) A2 term. We assume CJ = 25fF, Z0 = 50Ω and a qubit gap ω0 = 2π × 7.5 GHz. Note that c = 0 corresponds to infinite separation between the qubit and the line, as c ∝ 1/z.
