Finite sizes and smooth cutoffs in superconducting circuits
Emma McKay, Adrian Lupaşcu, Eduardo Martín-Martínez · Physical Review A · 2017
We investigate the validity of two common assumptions in the modeling of superconducting circuits: first, that the superconducting qubits are pointlike and, second, that the UV behavior of the transmission line is not relevant to the qubit dynamics. We show that in the experimentally accessible ultrastrong-coupling regime and for short (but attainable) times, the use of an inaccurate cutoff model (such as a sharp cutoff or none at all) could introduce very significant inaccuracies in the model's predictions.