Fig. 2: Spectroscopy for the qubit frequency and the SNAIL-terminated resonator frequency.
From: Resolving Fock states near the Kerr-free point of a superconducting resonator
a The qubit frequency vs. the external magnetic flux through the SNAIL. b The SNAIL-terminated resonator frequency vs. the external magnetic flux through the SNAIL. The nonlinear resonator is dispersively coupled to the qubit as shown in Fig. 1. S(ρee) ∝ ρee is the measured signal from the read-out pulse of the qubit. ωp is the probe frequency.
