Two-tone spectroscopy of high-frequency quantum circuits with a Josephson emitter
Two-tone spectroscopy of high-frequency quantum circuits with a Josephson emitter
We perform two-tone spectroscopy on quantum circuits, where high-frequency radiation is generated by a voltage-biased superconductor-normal-superconductor Josephson junction and detection is carried out by an ancillary microwave resonator. We implement this protocol on two different systems, a transmon qubit and a $\lambda/4$ resonator. We demonstrate that this two-tone Josephson spectroscopy …