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Scheme of the measurement setup. The SQUID with shunt capacitor coupled to the qubit. The pulsed microwave signal is applied via a cryogenic circulator, and the reflected signal is amplified by a cryogenic amplifier.
Microwave frequency applied to the SQUID vs externally applied flux. The measurement points show the position of a dip in the reflected signal amplitude for two different directions of the flux sweep.
Shift of the resonance frequency of the SQUID resonator by 30 MHz due to the qubit changing its magnetic flux by approximately . (a) In the linear regime. (b) SQUID driven in the nonlinear regime. Note the larger signal amplitude compared to the linear regime.
Coherent oscillations of the qubit at different driving powers, from bottom to top: −18, −15, −12, −9, and −6 dBm. Curves are offset by 0.1 for better visibility.
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